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Outdoor Free Flight Forum => Free Flight Scale => Topic started by: MKelly on May 12, 2019, 10:24:01 PM



Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on May 12, 2019, 10:24:01 PM
That's a good color Mike.  I was thinking about chalking some brown esaki for mine rather than printing a few acres of tissue.  Color scheme for mine will be kinda boring, drab on top, black cowl, linen on the bottom.  Jack McCleery's diary of his days on the Furious describes his aircraft being painted with red and blue stripes on the cowl, but I haven't found any picture of it or anything other references for markings or numbers on that bird.  All the photos I've found of the Furious Strutters show them very plain with no markings other than codes on the fuselage sides and numbers on the tails.  I'll probably do DJ3 as I've got the most pictures of it.

The last week I've been a bit distracted from the Strutter build.  Digging through the closet I came across a half-built Rockytop Stahl Spitfire that Bruce Finley gave me last year, and I felt suddenly compelled to finish it.  Bruce had built the fuselage and fin, then stalled out on the project.  I built the wings and stab, finished infilling the fuselage and added the rocker bumps over the cowl and moved the peg mount another bay forward.  Trial-fitting the wings showed they mounted kinda swept-back, and Crabby confirmed he had the same issue on his Spit build.  I cut some wedges and glued them to the root ribs to bring them back straight.  A little more work cleaning up the wing root/fillet areas and sanding the filler off the rocker bumps and it'll be ready to cover.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: FLYACE1946 on May 13, 2019, 09:14:47 AM
This is really going to look very nice. Great workmanship on the Spit.


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on May 14, 2019, 03:10:46 PM
Update on the Camel: Ive committed to an RNAS
Camel and have the color scheme roughed out.
The more I see the PC-10 effort I like it better.


Title: Re: Rockytop Stahl Spitfire
Post by: dputt7 on May 14, 2019, 07:43:04 PM
  All class Mike!


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on May 22, 2019, 08:13:22 PM

Moving along with a progress shot.
I struggled to get the rigging behind me due mostly my
lazy ass trying to align the wings "in the air"
 as I strung monofilament, Aint gonna happen this way.
Made a workable jig and here is the result. Rigging never gets easy.


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on May 23, 2019, 03:38:36 PM
That looks great Mike, hope to see it at Hamilton.  I'm still distracted by the Spitfire...

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on May 24, 2019, 10:33:07 AM
The colour and the rigging look great to me IMike. I guess the spitfire distracts me too - lovely work from both Mike's :)

John


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on May 24, 2019, 11:06:38 PM
Thanks John.  Woodwork is complete on the Spitfire - guess I'll have to commit on covering now.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: steveneill on May 25, 2019, 01:29:59 AM
Beautiful!


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on May 25, 2019, 10:12:33 AM
Mike
Nice wood working on the spit!


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on May 25, 2019, 01:31:45 PM
Guys
Here is 90% cplt camel. Will not add more labour (UK)
until test flights take place at Small Steps in Arkansas
this coming week end.

Model is done @ 1/12 scale netting a wing span of 28"
Power is elect using a GWS stik motor powered with 7.2v
Ni Cad 50 mah batteries swinging a 7.5" prop.
AUW is around 5 + OZ, should be OK with app 230 ish squares

Laser cuts have been checked out and the inevitable tweaks
dealt with on the file master.
Loading up on the web sight as we speak


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on May 25, 2019, 07:35:32 PM
It looks right Mike. The colour and rigging really set it off.

John


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 04, 2019, 02:49:46 PM
So Mike, how did the Camel fly?

Tissue work is in progress on the Spit.  Underside is white esaki, printed with sky green, then lined with colored pencil and chalked on the back.  Topside is brown esaki with the green printed over it, then lined and chalked lightly with yellow-tan on the backside to correct the colors and make it a bit more opaque.  Tissue went on the wings nicely and seems to be shrinking up well.  I like the green color achieved by printing over the brown tissue - may use this approach for the Strutter.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: billdennis747 on June 04, 2019, 03:36:43 PM
That upper surface finish is exceptional


Title: Re: Rockytop Stahl Spitfire
Post by: Pat D on June 04, 2019, 03:54:30 PM
Yes really nice work Mike as always !

 


Title: Re: Rockytop Stahl Spitfire
Post by: ZK-AUD on June 04, 2019, 06:50:59 PM
Mike those colours look really good.  I must learn to do that.  I wonder what the implications are for kit scale in the UK / NZ?  It's not a painted finish.  At the risk of starting one of those interminable rules discussions that don't really appeal,   how is this being handled in the UK?


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on June 04, 2019, 08:12:23 PM
Mike K
The wings for the spit are exceptional. Another one of your works of art.


I flew the camel at the Arkansas small steps over the wkend.
there is always good, high grass in Arkansas and minimal wind.
This was a real gamble for me since I tried to retain scale dihedral
(very close anyhow) A couple of short hops into the grass to ck CG.
Added some clay inside the cowl and tossed her into a mild thermal.
Right away she climbed out circling left and bouncing in the thermal.
Amazingly no hint of spiral instability (HUH) Wide circles down wind for 80 yds
landing near (12") a chain link fence that separates the parking area from the field.
Put her away dont gamble any more. This made the wk/end for me.


Title: Re: Rockytop Stahl Spitfire
Post by: Walt on June 04, 2019, 11:50:08 PM
Ironmike-congrats on the Camel doing well.  Mike K- the covering job on the Spitfire is outstanding- makes me want to build one!
Wally


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 06, 2019, 08:36:15 PM
Congrats on the Camel Mike - look forward to seeing it fly.

Thanks for the words on the Spitfire tissue - I like how this approach is working.  Got the fin and stab covered today - I'll shrink them tomorrow after the glue stick hardens a bit.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on June 08, 2019, 03:26:52 AM
Your covering efforts are consistently high Mike. Very impressive - the wing top surface looks just right in colour and appearance.

Congratulations on a successful prototype IM.

John


Title: Re: Rockytop Stahl Spitfire
Post by: TheLurker on June 08, 2019, 03:41:59 AM
Looks at Mike's model covering efforts.  Looks at own.  Cries quietly into beer.  :)


Title: Re: Rockytop Stahl Spitfire
Post by: danmellor on June 08, 2019, 05:06:04 AM
IIRC, when the question of printed tissue in KS has cropped up before, it's not a problem if the tissue or printing files are supplied with the kit. If you did it yourself, you'd probably get hammered. My first ever KS entry in 2008 was a Union Clipped Wing Cub with the supplied printed tissue and that seemed to be the Judge's position then.

Cheers,

Dan.


Title: Re: Rockytop Stahl Spitfire
Post by: SP250 on June 08, 2019, 02:22:55 PM
Dan

"Extensive computer generated colour schemes will not be excluded, but will have 5 marks deducted from their static score"
Page 87 2019 rule book.

John M


Title: Re: Rockytop Stahl Spitfire
Post by: vintagemike on June 09, 2019, 05:30:42 AM
Tell you what, that 1 1/2 Strutter certainly has a funny shaped and coloured tailplane!!!!!!! LOL


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 09, 2019, 11:27:32 AM
Yep, I get distracted from time to time, will get back to the Strutter soon.  Got two coats of dope and some tissue markings on the flying surfaces and left them blocked down in the garage while we traveled for the weekend.  I should have left a little more chalk on the upper tissue - it darkened a bit more than I expected when doped.  

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 11, 2019, 10:49:05 PM
A little dark but it'll do.  Got some tissue on the bottom of the fuselage today.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on June 12, 2019, 08:39:07 PM
What a beautiful distraction there Mike :)

John


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 13, 2019, 06:18:09 PM
Thanks John.  Got a little tissue on the right side of the fuselage today.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: Rhys on June 14, 2019, 12:10:48 PM
I've really been enjoying your build and of course the Spitfire. Wonderful work!

Rhys


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 15, 2019, 09:50:35 PM
Thanks Rhys.  Covered the left side of the fuselage, then spent an extended period trying to tug and tease the wrinkles out of the cowl top tissue without misaligning the color transitions at the seams.  Tedious, but I'm very pleased with how it came out.  I cut darts in the tissue at the forward corners of the cowl to get it smooth over that curve.

Next - fillets!

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: steveneill on June 15, 2019, 10:38:57 PM
So beautiful.


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 18, 2019, 12:30:41 AM
Thanks Steve.  Got the line work done on the fuselage and gave it a coat of dope.  While that dried I covered, lined and doped the carb intake, oil cooler and radiator.  Once the dope was dry I started working on the fillets - three pieces each side, from bond paper printed a light tan to (hopefully) keep the tissue colors consistent with the rest of the sheeted areas.  I'm starting to think it'd be better to do the fillets in thin balsa rather than bond paper, may try that on my next filleted model.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: FLYACE1946 on June 18, 2019, 11:43:43 AM
Mike the fact is : YOU ARE AN ARTIST. Well Done as always. Hope to see it in the air soon.


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on June 18, 2019, 06:38:36 PM
very nice Mike


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 18, 2019, 11:30:28 PM
Thanks Allen and Mike.  Fillets are covered, will dope them tomorrow.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 20, 2019, 11:59:43 PM
Exhausts are done, working on the cockpit.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: Pat D on June 21, 2019, 04:49:07 AM
Just love it Mike !

Pat


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on June 21, 2019, 09:14:09 PM
Beautiful tissue work Mike. The fillets seem darker - did you add another layer of covering? They match the fuselage perfectly.

John


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 21, 2019, 10:19:59 PM
Beautiful tissue work Mike. The fillets seem darker - did you add another layer of covering? They match the fuselage perfectly.

John

Thanks John.  I printed the bond paper used for the fillets a light tan color - once doped it makes the overlying tissue just about match the look of the sheeted areas.  Overall I'm pleased with the look this approach gave, but it did darken up more than I expected when I doped it.  I'd made up and doped a few test panels, but they weren't large enough to show the full color change the dope gives.  I think with a heavier layer of the same shade of chalk the brown and green would have been pretty much spot-on, or perhaps a matt Krylon sealant instead of dope would leave the final color closer to what the unsealed tissue looked like.  More experimentation for the next model...

Had fun with the hole punch today - pilot needed his reflector sight.  A few more dots of paint and I'll be able to seal up the cockpit.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 23, 2019, 11:33:25 PM
Canopy framing is complete - tissue over bond paper.  It looked naked without the rear-view mirror, so I cobbled one up from bamboo toothpicks, a bit of thin ply and a scrap of mirror sticker cut from leftover chrome sticker material from one of my son's Lego kits.  We'll see how long that lasts once this thing starts flying...

I haven't forgotten about the Strutter.  Today I found the website for Kip Aero, a Dallas-based firm that sells full-size reproduction Sopwith aircraft (Pup, Tripe, Strutter and Camel), purportedly following the original Sopwith drawings.  They are currently building a Strutter and have lots of very interesting pictures of the airframe and details here:  https://www.kipaero.com/aero-documentation/sopwith-construction/ (https://www.kipaero.com/aero-documentation/sopwith-construction/).  Looking through that has got me pushing to finish the Spitfire and get back to the Strutter!

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: Pete Fardell on June 24, 2019, 03:23:04 AM
Stunning! Thought it was a real Spit till I expanded the thumbnail pic, and still wondered then!

 (Just off to cry into the useless lumps of meat I used to call my hands.)


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 25, 2019, 10:49:42 PM
Thanks Pete, but given the PT-3 and other accomplishments there shouldn't be much crying around your workbench.  Spent the day finishing off the fuselage and tail group with lights, antennas and assorted lumps and bumps.

Mocked it up and did preliminary weight and balance this evening.  63.2g empty weight, with another 4g needed to get the CG in the calculated spot.  Not a featherweight, but not as bad as I had feared.  The calculated CG is pretty far back (47% of average chord), so I wouldn't be surprised if I had to add a bit more noseweight during trimming.

Tomorrow I'll finish off the fin (antenna wire anchor and rudder control horn) then tackle the gingerbread on the wings.  Once that's done it'll be ready for final assembly.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: yagua on June 26, 2019, 07:24:03 AM
simply: WOW!!!!!!


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on June 26, 2019, 08:16:55 PM
The canopy trimming looks very precise - no overlap onto the fuse! All those details so nicely done - the exhaust looks very realistic. A masterpiece of tissue covering as well Mike.

Pat yourself on the back!

John


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 26, 2019, 11:03:09 PM
Thanks John.  I cut the aft section off the kit's vacu-formed canopy and did that area using some thin flexible sheet plastic.  The main canopy overlaps the fuselage opening by about 1/16", but that gets hidden by the framing.  I've been having fun with the build - the basic shape has a lot of differences from a real Spitfire (not surprising when you think about what info a young American would have access to about a UK fighter in 1939), but it's been a hoot trying to capture as much of the character of the real aircraft within the limitations of the kit.  Here's hoping I can get it flying reasonably well without tearing it up.

Cheers,

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: marcin_pl on June 27, 2019, 02:56:15 AM
May I kindly ask the moderator to divide posts about Spitfire into another thread? Supermaine Spitfire is neither Sopwith Strutter nor WWI plane.

Marcin


Title: Re: Rockytop Stahl Spitfire
Post by: PietenpolAC on June 27, 2019, 04:07:21 AM
Mike,

I love your attention to detail and clean work. It makes all the difference in the world.

Bruce


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on June 27, 2019, 12:45:37 PM
Great build Mike
Lotta w/out needed my friend.


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 27, 2019, 02:31:25 PM
Thanks guys.  

Lotta w/out needed my friend.

Mike, I built about 7/32" washout into each panel and pinned to hold it during shrink and doping (see pic).  Think that'll be enough?

That leads me to a question for the group - when measuring incidence on wings with lots of washout, where's the reference point for comparison with the stab?  My thought was to measure the wing incidence at the average chord point.

Mike



Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on June 28, 2019, 02:59:33 AM
If the wing has linear washout from the root to the tip then using the incidence at the mean geometric chord should be close I would think.

John


Title: Re: Rockytop Stahl Spitfire
Post by: ZK-AUD on June 28, 2019, 06:28:33 AM
Oh boy. I seldom get involved with these discussions because I know so little but logic would suggest that it’s the average incidence of the wing from root to top but with a weighting to take into account the effect of taper i.e. reducing wing area as you go outboard. Come on gurus there has to be a formula for this


Title: Re: Rockytop Stahl Spitfire
Post by: billdennis747 on June 28, 2019, 06:48:23 AM
Isn't nearly 1/4" rather a lot? It must be getting close to negative decalage.


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on June 28, 2019, 05:06:26 PM
Remember my Zero it had close to 3/8+ w/out ea tip.
Flew like gang busters


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 28, 2019, 07:22:58 PM
It does seem like a lot of washout when you look at the model.  The instructions recommend at least 3/16" washout - I overestimated how much the wing would spring back and ended up with another 1/32 per side.  It's the same on both sides and seems to be holding nicely, so I'm not going to mess with it before trim flights.  My main concern is getting a good starting decalage for the model.  On the T-28 and Little Gem (both of which had significant amounts of washout) I had trouble with nosing in as the model picked up speed, which got fixed by increasing the decalage and moving the CG slightly forward from the TVo-calculated position.  Given all the washout on this model I'm going to start trimming with the CG a bit forward and edge it back once I've got a feel for how the model flies.

Got the rest of the gingerbread on the wings (tip lights, walkway lines, gun port patches and landing gear) and finished up the noseblock and spinner assembly today, along with adding a second set of magnets on the lower wing root as insurance against the wings popping loose in flight.  Still have to paint the power unit and do final assembly on the tail group.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on June 29, 2019, 10:14:57 PM
Thanks Ratz for separating this build from the Strutter thread!  In the future I'll attempt to be more disciplined with my topics.

The Spitfire is done!  Rigged the tail, painted the prop and spinner, finished up the lights and installed the antenna and antenna wires.  I had to play with the stab mount a bit - I built a Schmidt incidence meter (http://www.modelflight.com/incidence.html (http://www.modelflight.com/incidence.html) and checked the decalage, decided I needed to allow a bit more negative incidence in the stab.  The wing twist is dramatic when you measure the incidence: +2deg at the root, -.75deg at average chord, and -6deg at the tip - 8 degrees of twist across the span!  I set the stab for 1deg negative incidence compared to the wing at average chord as a starting point with adjustment to go another degree and a half if necessary.  We'll see how it flies...

It took about 5g noseweight to balance the model at the TVo-calculated cg (~47% of average chord, 2.25" back from the LE at the root).  I drilled holes in the noseblock well and embedded three fishing sinkers in the cowl to get things close, then added a bit of clay over the lead to get to the final balance.  Weight without motor is 68.7g.

Look forward to seeing how it'll do in the air.

Mike

Cheers,

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: FLYACE1946 on June 29, 2019, 10:53:51 PM
AMAZING to see this great project ready for the SKY. Maybe soooon I hope.


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on July 01, 2019, 10:32:19 PM
Quote
Oh boy. I seldom get involved with these discussions because I know so little but logic would suggest that it’s the average incidence of the wing from root to top but with a weighting to take into account the effect of taper i.e. reducing wing area as you go outboard. Come on gurus there has to be a formula for this

The Mean Geometric Chord or as it is also known "Standard Mean Chord" does  allow for taper and plan form shape with it's actual chord length and it's span wise position. For all practical applications the Aerodynamic Centre can be located at 25% of the MGC from the LE of the MGC. The 50% chord of the MGC position should be located on the wing plan form centroid. Finding the centroid on wing plan forms such as the Spitfire is much easier now with CAD! Although you could hang a card copy of the shape from a couple of different points and the intersection of the plumb lines would give it.

Well hope that helps Mike (ZK AUD).

I think you should be close Mike with those settings. This nice spit deserves to fly well.

John



Title: Re: Rockytop Stahl Spitfire
Post by: FLYACE1946 on July 01, 2019, 10:36:34 PM
AMAZING to see this great project ready for the SKY. Maybe soooon I hope.
Saw this Jewel take flight today. Really Nice to see up close.


Title: Re: Rockytop Stahl Spitfire
Post by: skyraider on July 01, 2019, 11:40:09 PM
Mighty fine looking Spitfire there Mike!  Very well done. I can really appreciate the
detailing that you've put into her. Great panel lines and the whole ten yards. I hope
she rewards you with some outstanding flights soon. Looking forward to your flight
reports. Excellent work!

Skyraider


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on July 02, 2019, 08:30:40 AM
Thanks Skyraider!  As Allen said, the Spitfire took wing yesterday on a short, fat motor (4x20" loops 1/8", ~14g).  Video at:  https://www.youtube.com/watch?v=PiFyDNOI0Ck (https://www.youtube.com/watch?v=PiFyDNOI0Ck)

I had to take a huge amount of decalage out to make it fly - the washout made less of a difference there than I had anticipated.  Haven't measured the after-trimming incidences yet.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: DavidJP on July 02, 2019, 08:43:35 AM
And very nicely too!  Well done.


Title: Re: Rockytop Stahl Spitfire
Post by: steveneill on July 02, 2019, 10:20:33 AM
Great job.


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on July 02, 2019, 10:32:16 AM
Well done Mike well done.
Amazing that we put in too much stab that always
needs to come out during trim session.


Title: Re: Rockytop Stahl Spitfire
Post by: Crabby on July 02, 2019, 10:57:18 AM
Hi Mike That's just about how I had mine flying, only it never got better. Finally got a nice climb then she spilled off to the left and cartwheeled, amputating the wing. I decided it looked kinda heavy and clownish with all that camo and roundels and really not flying that well so I purged it with a bunch of others that were just taking up space! What is your stab setting? You are off to a great start!


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on July 02, 2019, 03:05:49 PM
It is the wash out man, the washout that enhances the dihedral.


Title: Re: Rockytop Stahl Spitfire
Post by: Don McLellan on July 02, 2019, 04:07:05 PM
Beautiful model, and very nice trimming flights Mike! 


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on July 02, 2019, 09:50:22 PM
It looks like it is trimming out well Mike. Looks great in the air. The indications of too much decalage surprise me a little - - it's almost as though the outer section of the wing is providing little to no lift and that most is being provided by the root section. If this was the case then as you set the tail originally to -4.75 deg relative to the root it would definitely seem too much.
There is always more to learn or fully understand.
Congratulations on a model that flies a well as it looks.

John


Title: Re: Rockytop Stahl Spitfire
Post by: flydean1 on July 02, 2019, 10:05:11 PM
Thanks for resisting the temptation to try to cure all problems by adding nose weight.  If you have to put in a lot of downthrust, the CG is too far forward.  It looks like you pretty well have it ironed out.

It is also an extremely well done model.


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on July 03, 2019, 06:15:48 PM
Thanks for all the kind words.

Crabby, here's a pic showing the post-trimming stab position.  I measured the incidences this afternoon, the stab is 2 deg negative compared to the root rib (about 2 deg positive compared to the average chord).  I noticed that the stab is starting to warp - going to have to do something about that...

Flydean, I did end up adding a pinch or two of clay (less than a gram) up front during glide trimming because the model started getting twitchy as I decreased the stab incidence.

The magnets to hold on the wings weren't giving me much confidence, so I spot-glued the wings on for trimming.  Still undecided whether to stay with that or retrofit a more rigid system than the two carbon rods.

Cheers,

Mike



Title: Re: Rockytop Stahl Spitfire
Post by: DHnut on July 03, 2019, 06:41:25 PM
Mike


Title: Re: Rockytop Stahl Spitfire
Post by: DHnut on July 03, 2019, 06:49:40 PM
Mike,
        Not sure what happened the post just vanished. The incidence difference is surely within the normal range and the model is flying. Perhaps the washout is working very well as it did on the original. I have used magnets on a FW190D and the reason it is still in one piece is that the wing was able to seperate when it arrived, which it did far to often. I am doing a larger version using the same approach. I use a short peg in the leading edge with one or two magnets on the trailing edge and locators on the side that to provide alignment.
   Ricky


Title: Re: Rockytop Stahl Spitfire
Post by: TheLurker on July 04, 2019, 02:19:59 PM
Great job.
+1


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on July 05, 2019, 10:51:50 AM
No biggie on the stab warp.
It will finally settle in, just may need to tweak the trim if flight gets affected.
I ve had many models with stab warps, I just re trim.


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on July 28, 2019, 11:20:11 AM
Took the Spitfire to Geneseo for the FAC Non-Nats and flew it in FAC Rubber Scale and the Battle of Britain Mass Launch.  Very pleased with how it flew, especially since I'd only had the one low-power trimming session and the model had been heat-cycled in the back of the pickup for 10 days prior to the meet.  Flew it on 4x33" loops of 1/8" rubber (22g, about 23% of flying weight) - given the performance shown I think it should easily take 36" or maybe 40" loops giving somewhat longer flights.  

Video at:https://www.youtube.com/watch?v=vJqAD4qcINU&feature=youtu.be (https://www.youtube.com/watch?v=vJqAD4qcINU&feature=youtu.be)

Ratz, this can be moved to the completed builds section.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: Don McLellan on July 28, 2019, 01:30:31 PM
Nice flights Mike!


Title: Re: Rockytop Stahl Spitfire
Post by: ironmike on July 28, 2019, 05:59:18 PM
Looking fantastic Mike, well done.


Title: Re: Rockytop Stahl Spitfire
Post by: Crabby on July 28, 2019, 06:19:56 PM
Now you did it Mike. I am jealous as hell.


Title: Re: Rockytop Stahl Spitfire
Post by: FreeFlightModeller on July 29, 2019, 08:09:02 AM
Great flights  :)


Title: Re: Rockytop Stahl Spitfire
Post by: yagua on July 29, 2019, 11:47:51 AM
 :o :o :o :o :o


Title: Re: Rockytop Stahl Spitfire
Post by: MKelly on July 29, 2019, 11:30:12 PM
Thanks guys - this one is making me happy.

Mike


Title: Re: Rockytop Stahl Spitfire
Post by: Prosper on July 30, 2019, 02:28:22 AM
I made many failed attempts to download the video in HD (my connection is too slow and erratic for streaming) and finally obtained the 720p version. It was worth the effort - that last minute-plus flight where it flies back to heel is really nice. Congrats Mike.

Stephen.


Title: Re: Rockytop Stahl Spitfire
Post by: bgrove on July 30, 2019, 01:36:27 PM
Beautiful plane!!  and great videos of trimming her up.  I can't wait to see more.


Title: Re: Rockytop Stahl Spitfire
Post by: OZPAF on July 31, 2019, 09:01:57 AM
Beautiful plane and flight Mike. Good climb, cruise and glide. The right glide is quite strong.

John