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 1 
 on: February 26, 2017, 09:49:42 PM 
Started by skylines - Last post by ykleetx
Would it be possible to show us a photo of your model? Even better, show us a video.

Other than the motor stick bending, here are additional things that would make your model dive under power:

- No enough dihedral relative to rudder
- CG is too far back
- too much down thrust

 2 
 on: February 26, 2017, 08:56:14 PM 
Started by Flyguy - Last post by calgoddard
Flyguy -

Another awesome build on your part.  I wish I could build (and fly) as well as you. Your video of a trim flight on a cold day was impressive, as usual. Steering out of a thermal - very clever.

You have perfected your various techniques.  I love to see you apply them to different models and see which ones fly the best.

Keep up the good work.  Spring is coming.


 3 
 on: February 26, 2017, 08:09:19 PM 
Started by Flyguy - Last post by Flyguy
Thank you, I'm looking forward to getting out and doing some flying this year with the Sky Gull soon!

 4 
 on: February 26, 2017, 07:08:15 PM 
Started by Andrew Darby - Last post by ZK-AUD
John I have similar precious memories of my dad building an Airsail Skeeta (1947 design that they produced up until the early 80's)  This too seemed huge to me at the time,  but my overriding memory is sitting on a stool just off his right shoulder watching, rapt, and hoping against hope that he would keep on building and wouldn't notice me and send me to bed.  Lock these memories in Andrew.

 5 
 on: February 26, 2017, 05:55:11 PM 
Started by Andrew Darby - Last post by OZPAF
What a great time you are both having. I remember being well and truly hooked at a similar age. During school holidays I found out that my mate's father was building a KK Gypsy. It was huge to my young eyes. I spent hours there on a chair quietly watching over the next few days.

My father also supported me - but that memory was a standout.

All the best for you both.

John

 6 
 on: February 26, 2017, 05:32:49 PM 
Started by Pete Fardell - Last post by OZPAF
Very impressive covering job Peter.

John

 7 
 on: February 26, 2017, 04:39:11 PM 
Started by Andrew Darby - Last post by daveh
The first model I ever helped my Dad to make was a semi-profile Percival Provost with printed wood sides, wings and tail in a similar manner to the kit Jimbo is making. I think it was made by a Liverpool firm called Lark Lane models. The two fuselage sides were joined by strips about 1/2" wide, hence my description of 'semi-profile'. I was probably about seven years old so it must have been about 1954 or 55. I hope that Jimbo gets as much pleasure from his build as I did from mine and that he goes on to a lifetime of modelling. Sadly, neither of my sons got past the stage of watching me fly models I built for them so you are a lucky chap.

Dave

 8 
 on: February 26, 2017, 04:03:52 PM 
Started by skylines - Last post by mgracer
Thanks for the prompt reply!
My student has one of the official 2017 kits....it is the complex one with lots of building jigs, carbon fiber wing and tail outlines, little adjustment tubes and the 20 page instruction manual.   It will probably build into a nice airplane.....for someone with years of indoor experience.    We are not even considering it.

The airframe we are using is still undergoing a bit of refinement, but the basics are pretty well set.    Very low parts count and survivability from less than delicate handling are prime design elements.     A 1/8 thick balsa motor stick that tapers after the rear anchor hook with 1/32 platforms to epoxy foam wing and tail onto.       
The wing and tail are cut and sanded to shape from 1 lb/ftsq foam.    Without any effort at weight control, we can get a  5 gram airframe.   We have an easy 2 1/2 gram to play with for adding strength where required.       The simplest of the variations only takes 20 minutes or so to build....most of which is sanding the top of the wing to shape, and waiting for the 5 minute epoxy to set.

The local hobby shops only carry FAI TAN rubber in two sizes, so we are twisting a single strand (not a loop) of 1/8 about 16 to 17 inch long.    We tested a length to destruction, and got about 125 turns per inch.     It measured 27-28 gm/cm of torque when it failed.        Anyway, for front yard testing, I test at 400, 800 and 1200 turns just to be conservative.   We should be able to wind 1600 turns with relative safety for contests if I can get this annoying trim issue figured out.

We have mostly been using formed balsa props with slightly different cambers and blade areas.   An old (my last existing example actually)  North Pacific  prop was used as a pattern, and slight adjustments were made from there.  Blades are glued to a 1/4 inch square spruce center and a hand formed .020 wire is poked thru the center and glued.    Weights are  around .5 grams  and while not perfectly matched yet, they do perform well.    The occasional breakage is repaired with a drop of superglue.   I have made a prop from a plastic cup, so more experimenting and testing will be done.

Bending of the motor stick is not the cause of the diving under higher power.    One of the early test designs was a hollow balsa tube with the rubberband inside.   No bending or twisting on that tube but the complete airframe still showed the diving as turns were increased.

I have made several dozen airframes in the past month, at least a dozen props and several hundred test flights in my front yard.   All of the various configurations have shown a tendency to dive as the turns and power are increased.       I can overcome the diving with brute force trimming methods, but at the expense of glide under no power.     The head scratching and confusing part is that this is exactly opposite from my experience with all other aircraft from peanut scale to full size piloted experimental aircraft.    Normally when you increase power, the aircraft should climb instead of dive.     

On an amusing note, two of the airframes have been lost out of sight.   The first went over the roof of my house while still climbing and is probably only several hundred feet away....but just not in my backyard.     The second was a test flight using a 5 inch guillows plastic prop because it was handy and ballasted the airframe properly.  (Guillows are about the least effecient and heaviest prop I can think of.)  It was about 200 ft and still climbing when it went behind a row of tall trees.    It had been decades since my last out of sight flight.

 9 
 on: February 26, 2017, 03:55:47 PM 
Started by dslusarc - Last post by dslusarc
Here is my updated for today. Took the model to our regular flying session. Been messing with the trim. I ended up taking incidence out and my times went up. First did 2:17, then took a little out then did a 2:22, then a hair more out and did a 2:36. Interesting the model raced around the first two laps so never got to the ceiling like I did on my 2:17 flight. The height was just about 20-22ft. Loop is 16.25" TSS, June 16 batch. 2050 turns minus 30 and .48 in oz torque.

Don

 10 
 on: February 26, 2017, 02:50:04 PM 
Started by Andrew Darby - Last post by Andrew Darby
I started with the KK models at about 11, my dad wasn't interetested at all, and my mum used to complain about the smell of dope in the kitchen.  So for my 12th Birthday my dad made his one and only contribution to my hobbies by kitting out the old garden shed with a work bench and cupboards from old kitchen unit, along with electricity it made a decent workshop for my aeroplanes and fixing bikes.  So when Jimbo showed interest I was on it like a shot, but then again if he gets bored it's up to him.  I just want to give the opportunity to give it a go.  I hope that it works out well for your grandkid Jim.

Anyhow, some progress on the build. Shaping the wings consists of fitting ribs, whilst holding the curve on the wing with the jigs that come in the kit until the glue dries.  This was a bit tricky but he managed it ok.

We then fitted the wings and struts, propping up the model 32mm as shown on the plan. Again a bit tricky but we got there in the end...




 11 
 on: February 26, 2017, 02:47:15 PM 
Started by Pete Fardell - Last post by Pete Fardell
It's looking slightly better now...
I applied thinners to the topside to slacken the tissue again and then gave it a new coat of (thinned) dope but let it dry as shown. This has forced in some washout. I'll try the same with the shorter bottom wing now.

 12 
 on: February 26, 2017, 02:13:53 PM 
Started by Pete Fardell - Last post by Pete Fardell
Thanks, Jon.

I've been doping the wings today. They are very rigid, which is a good thing I suppose except that I'm beginning to worry about stability. Usually I find I can steam in some washout after covering, but this wing is having none of it and I should perhaps have built in washout on the board. The trouble, I think, is the acetate trailing edge. It's worked quite well for the scallops but can't be warped, steamed or coaxed like a balsa TE. The wings have no dihedral, which also worries me, although I'm hoping the little sweep up to the end ribs will help a bit.

 13 
 on: February 26, 2017, 01:49:50 PM 
Started by danmellor - Last post by FFmodeller
I hear that the ALL (Anti Lacey League) are planning a protest outside the hall at the Nats.

When you hear their battle cry of "Dihedral NOT tip plates" ... just remember, you brought it upon yourself.  Wink

 14 
 on: February 26, 2017, 01:10:24 PM 
Started by rgroener - Last post by rgroener
It's quiet here... I assume everybody is building and has no time to post progress.

I did a big part of sanding today. Started with the undercarriage and did some work at the tank.
It is coming along nicely and I am looking forward to see it in the air.
I hope to start with the covering soon.
Most likely, I will take the yellow colour scheme as suggested on the package.

Roman


 15 
 on: February 26, 2017, 12:28:34 PM 
Started by ZK-AUD - Last post by rgroener
Dont hurry, I just wanted to ask if there are some news...
Good to hear that you are busy building and enjoying the airshow.
I hope to post more pictures after our spring meeting next month. At the moment I am busy eating out to make sure that the weather is nice Grin



 16 
 on: February 26, 2017, 10:10:06 AM 
Started by climber - Last post by DerekMc
Where do you get 1/4 mil Mylar?  I see plenty of the 1 mil variety but not so much for the 1/4 mil.

FAI Model Supply is one source:  http://www.faimodelsupply.com/

You will find it in the Coverings section.

 17 
 on: February 26, 2017, 09:08:07 AM 
Started by danmellor - Last post by danmellor
Lacey wing and tip plates covered, fin covered and tailplane sanded. One more fus side to build. Say what you like about Laceys; they build quick!

Cheers,

Dan.

 18 
 on: February 26, 2017, 08:47:48 AM 
Started by pbrown - Last post by hastf1b
Here a Picture postet from the builder on Facebook.

Heinz

 19 
 on: February 26, 2017, 08:33:56 AM 
Started by climber - Last post by pedwards2932
Where do you get 1/4 mil Mylar?  I see plenty of the 1 mil variety but not so much for the 1/4 mil.

 20 
 on: February 26, 2017, 08:04:51 AM 
Started by MKelly - Last post by Balsa Ace
She looks & flies great.Thanks for posting a pic of the vintage box.With slogans
like,"Value and Performance above all","Flies like a Real Airplane",and "All Parts
Finished Ready to Assemble",it's easy to see that these kits were a labour of
love for the manufacturer.

The reply that you received from the seller was great too.

Scott

 21 
 on: February 26, 2017, 07:49:26 AM 
Started by pbrown - Last post by hastf1b
Some data:  50" span; wing built on a polystyrene jig, faced with balsa and then clingfilm;spars all laminated;LE at curves, in small sections...... powered by an AM 15 diesel,shortly to be electric,tho, as the AMs a bit messy...........the wings easy to do, but takes a while, is all.........the 8x4 TopFlite prop is the best bit... I dont think you can get em anymore, and they were always the best nylon props I found.....

Heinz

 22 
 on: February 26, 2017, 06:56:07 AM 
Started by pbrown - Last post by hastf1b
More Information: https://www.rcgroups.com/forums/showpost.php?s=8387144c591a5a23df9a31e1d4d70b78&p=24448754&postcount=5


https://www.rcgroups.com/forums/showthread.php?1852112-Aircraft-identification with Video (last post)


Heinz

( Pete I send you a PM.)

 23 
 on: February 26, 2017, 05:39:09 AM 
Started by MKelly - Last post by Work In Progress
That goes like crazy! I'm astonished at the performance.

 24 
 on: February 26, 2017, 05:37:22 AM 
Started by korale - Last post by korale
Flite test have a nice 24 inch Corsair thats meant to be built out of foamcore board, http://www.flitetest.com/articles/ft-mighty-mini-corsair-build

It's intended for RC but I reduced the drawings to 75% and made some modifcations to the plan and built it out of 3mm Foam and paper.

I had some construction photos but my wife deleted them to make room for some pics of the kids. Here is th stage that its at.

its about 18 inches wingspan and 15g so far, I  have the nose block, canopy and colours left to do

 25 
 on: February 26, 2017, 03:57:48 AM 
Started by danmellor - Last post by Jack Plane
And I was THAT close to starting to like Laceys!  Grin

I'm with Pete...!  Cheesy

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