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Author Topic: Bostang B51  (Read 8534 times)
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rgroener
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« Reply #25 on: April 02, 2012, 02:17:47 AM »

Tom, the Bostang looks great! Sorry for the confusion at the wing center part. I checked the plan and you are right, it was not clear at all Embarrassed I corrected it some minutes ago. Please let me know if you find some more booboo's Tongue If you finished your build and I corrected all the flaws, I will ask for updating the plan in the plan gallery.
Looking forward to your finished Bostang. Covering is quite easy, since everything is flat and agular Wink

I will check the CG on my Bostang as soon as possible. (I didn't note the rubber length after the good flights. So I have to check it again Embarrassed)

Best regards Roman
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Sky9pilot
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« Reply #26 on: April 02, 2012, 03:28:35 PM »

Thanks Roman...

I'll post my progress here if that ok....I really do like this creation of yours...I plan on making another one of not more....My fetchermites would love this little bird...I can see a olive green bird with some white stripes etc...Invasion stripes...there are a lot of schemes for the P-51 B&C models...

Tom
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« Reply #27 on: April 03, 2012, 02:48:30 AM »

I want to thank Roman again for this great little model...

Here's the pictures of the Red Tail Bostang...I used some sheet plastic off the tissue wrapper from the Dollar Store where I found the silver tissue for the canopy glazing. The white stuff at the base of the windscreen is the white glue I use, dries clear... The silver tissue is a bit heavy and I haven't weighed this yet...but it shrank up pretty well...just a few wrinkles on the wing tips and at the wing roots. I'll take a bit more time and glue some 1/32 strip for tissue anchors at the wing root on the next one...

I think it's coming alone nicely...here's the pics...

Roman thanks for letting me jump in here on your thread...

Tom
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rgroener
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« Reply #28 on: April 03, 2012, 01:56:17 PM »

Tom, your welcome!

 I just measured the CG of my Bostang. It's not an easy task.... Roll Eyes

At the middle of the wing center section, the CG is 22mm behind the leading edge.

22 millimeter = 0.866 141 732 28 inch

I will also draw the CG to the corrected plan.

Best regards Roman
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« Reply #29 on: April 03, 2012, 03:05:04 PM »

Thanks Roman for the information on the CG I hope to have the prop ready soon for those testing/trimming flights if the thunder storms will stop here in Texas...

Tom
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« Reply #30 on: April 06, 2012, 06:26:30 PM »

Here's the progress so far on the Redtail Bostang of the Tuskegee Airmen....still have the prop to finish and the spinner...the spinner was just an old one in the scrap box to give the nose some shape...the proper spinner will be red....

Tom
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rgroener
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« Reply #31 on: April 07, 2012, 04:24:45 AM »

Tom, if I see your nice detailed finish, I am thinking that I should have spent more attention to the details on my prototype Bostang Roll Eyes
I assume, that I was just to curious if it flies.... I just call it the factory scheme, if I build another one, I have to use a nicer one.

As a motor, I use one loop (50cm long) of 3/16" SS rubber. This motor combo seems to work quite well. But for sure it's not the ultimate Bostang motor. Please let us know if you find a better one...

By the way, the Bostang plan in the plan gallery has been updated. Thanks Ratz!
Thanks Tom for being my beta tester of the Bostang. I hope that I corrected now all the flaws.

Best regards Roman
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higgsbason
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« Reply #32 on: April 07, 2012, 06:49:19 AM »

I like your charming design Roman!

Tom, very nice finish my friend! Wink I have read all about the Tuskegee Airmen, rather interesting accounts.

Happy landings. Smiley
Mike
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« Reply #33 on: April 07, 2012, 08:48:52 AM »

Tom:

How did you do the insignia?  And the lettering?  They look great!

Also, how did you do the hubs?  I've turned a couple of balsa wheels for mine, but not sure how to get the "look" you have on yours.

Scott
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« Reply #34 on: April 07, 2012, 01:39:29 PM »

Scott....

It's really simple...

I first determine the thickness of the tire/wheel combo and make the number of center discs to almost reach that thickness less 1/8 thickness.  I then cut two donuts outer layers with my Olfa circle cutter...cut outside first then go back and cut the inner diameter circle to desired size.  I then laminate all the discs cross grain using a pin or wire to center the discs as they are laid up for gluing...if I'm in a hurry I use Cyanoacrylic (super glue) sparingly usually just four dots in a cross pattern...If not in a hurry I use white glue and let it set overnight.

I usually use an aluminum or brass tube for the axle bearing through the hole the pin/wire was in...if you have a drill press I'd use that to make sure the hole is enlarge to tube size and vertical for true running wheel...pin vice and small drill bit can be used also being very careful to keep it as vertical as possible... I make sure the tube is as long as the overall width of the wheel/tire and glue it with Cyano carefully making sure none gets into the tube...I then take 1/16 sq or 1/16X1/32 for spokes in the hub and just glue them into the hub on one side in the cross pattern depending number of spokes....I usually start with the 90degree cross pattern first then fill in the other spokes making sure they are straight across from each other....hope this helps...picture below to help clarify...

Here's a link explaining how I do my tissue decals printed on tissue with an inkjet printer and applied with gluestick right on the srunken tissue of the airframe: Click Here for Tissue Decal explaination
Tom
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rgroener
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« Reply #35 on: April 08, 2012, 03:25:27 AM »

Mike, thanks for  your kind words. I am happy that the Bostang disign appeals to many people. I am glad that I can give something back to the comunity.

FFScott, you are building a Bostang? Hope you will post some pics. Do you also plan to give it a pilot? My pilot has become the victim of a bouncing rubber. It was lying in the fuselage. I had to "operate" it out of the fuse through the motor block hole. Had to cut his arm for this. At the moment, no chance to install it in one piece in the cockpit. Have to wait until the wing pops off...  At the moment it's a Flying Dutchman Roll Eyes

Tom, thanks for your explanation about doing the wheels. I have to try it in one of my next projects.

Happy easter and best regards Roman
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« Reply #36 on: April 09, 2012, 06:12:33 PM »

Mike, thanks for  your kind words. I am happy that the Bostang disign appeals to many people. I am glad that I can give something back to the comunity.
Happy easter and best regards Roman

Just a sign of the genius of the designer....Roman Wink Cool

Tom
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« Reply #37 on: April 10, 2012, 02:16:52 AM »

Hi Roman, Thanks for your response. I have watched the flight videos and downloaded the plan, if I do build your model I would shrink it to 8" size span, but no promises as I am rather busy at the moment to finish my other builds.

Mike Smiley
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rgroener
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« Reply #38 on: April 10, 2012, 06:12:04 AM »

Mikey D, I see.... 8"  Shocked for you, Bo comes from Bonsai. Grin  Therefore the very small Bostang.
If you really build it, I would love to see it.
Best regards Roman
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« Reply #39 on: April 10, 2012, 07:31:25 AM »

Mikey D, I see.... 8"  Shocked for you, Bo comes from Bonsai. Grin  Therefore the very small Bostang.

Well I hope it is easier to trim than a bonsai. Cheesy Now that is extra cheese for ya... not that I can compete with the Swiss. Grin

Tom, I know the weather has not been so great on your side, but have you had a chance to put your stang to the test yet?

Mike
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« Reply #40 on: April 10, 2012, 03:36:19 PM »

Mike,

Looking forward to seeing your 8" Bostang...that's a bit small for me...though....

Here's my progress so far...just getting the Spinner/prop hub completed and the prop blades laminated from 1/32 balsa.  The blades will be mounted on bamboo and then mounted on the prophub...

Here's a couple of pics...

Tom
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« Reply #41 on: April 10, 2012, 09:30:50 PM »

I've modified the Bostang a little and am building it.  I have some pictures but need to reduce them so I can post them here.

Scott
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« Reply #42 on: April 11, 2012, 01:20:03 AM »

Tom, that spinner is great! I can't wait for the maiden and possibly video or in-flight pics.

Roman, would you perhaps consider this in V.1.4? I have seen how well the Bostang flies despite it's bulky shape, however
my only concern is that it is a bit too much dihedral for an 8" model and the thrust line is too high to lower the wing tips any further without having to put lead in the wheels. But don't worry about it I'm sure I can work around this minor issue.

Scott, I'm looking forward to your progress! Smiley I just have to finish a penguin on skis by today, I will post pics in (show us your latest creation) thread when I'm done and hopefully I will join you.

Mike
 
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« Reply #43 on: April 11, 2012, 03:29:04 PM »

Mike...thanks for the comments....

Don't have a video camera but hope to get some still shots with the digital camera.....

Got the components of the prop made...blade and prop hub/spinner...need to add the bushings in the hub and noseblock and freewheeling ramp on the hub.  Thunderstorms predicted for the next three days...had a big one last night with pea gravel sized hail....told my grandson in CA about hail...ice falling from the sky...his reply, "Holy Moly"!  He's six.  So no flying because when it's not raining or hailing, it's blustery with gust of wind.

Couldn't find my pitch guage...packed away somewhere...so I made a guage with a 45 degree angle for setting the pitch, out of scrap balsa, as you can see.  Here's the pics so far.  Still need to finish sand and at tissue to the blades for strength...more later....

Tom
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« Reply #44 on: April 11, 2012, 07:42:33 PM »

Tom you have done Roman's great little Bostang proud. Thats really neat - love the 4 blader prop.
Hope the weather gives you a chance to fly soon.
John
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rgroener
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« Reply #45 on: April 12, 2012, 03:18:38 AM »

Tom, the four blader looks great. I might have to update my Bostang with a four blade prop too Wink

Mike, in version 1.3, I lowered the rear peg hole quite a bit. I think I would go down to the longeron, but not further due to the emerging angle of the rubber to the prop hook. With the rear peg the longeron, you could reduce the dihedral 25% on each wing. To bring it even more down, a redesigning of the nose section would be necessary.

Best regards Roman
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« Reply #46 on: April 12, 2012, 02:20:15 PM »

Made some more progress on the prop...

Here's the prop blades and hub with freewheeling ramp....then a shot of the prop stationary and got a little artsy and shot the prop spinning as I made Merlin taxi noises as she was preparing to taxi out for a sortie.... Grin Cheesy Wink

Tom
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« Reply #47 on: April 12, 2012, 05:42:27 PM »

After looking at the spinning prop pic, decided it needed a dark background...thanks for your patience with me in adding another pic....

Tom
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« Reply #48 on: April 12, 2012, 09:39:23 PM »

I'm back....found a red plastic picnic plate...so plunged molded two spinners for the Bostang....you never can tell when you'll need an extra spinner.  Shocked Roll Eyes  Made the prop shaft from .032 music wire and bent in the reverse "S" hook in one end...So just some last minutes trimming and attention to setting the prop pitch and we're ready to fly if the April showers will give me a break.

Here's the final pics till flying...

Tom
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Re: Bostang B51
Re: Bostang B51
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« Reply #49 on: April 12, 2012, 10:10:38 PM »

Great work Tom. It almost makes you think their should have been a full size Bostang to rival the Mustang Grin
John
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