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Design => Stunt design => Topic started by: bob werle on November 09, 2009, 10:48:18 PM
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I am flying a 1/2a stunter with a Brodak .049 Mk2. I love the way it flys and want to scale it up for a Veco .19 I nave that needs a home. The !/2a gas a 29" span and a root chord of 7" . I am thinking of going up 140%. That would go to 39" span and a 10" foot chord. Will this be too small for the Veco? I could go to 150% which would be about 43" span.
I never tried to make a ship bigger usually smaller.
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I am flying a 1/2a stunter with a Brodak .049 Mk2. I love the way it flys and want to scale it up for a Veco .19 I nave that needs a home. The !/2a gas a 29" span and a root chord of 7" . I am thinking of going up 140%. That would go to 39" span and a 10" foot chord. Will this be too small for the Veco? I could go to 150% which would be about 43" span.
I never tried to make a ship bigger usually smaller.
Veco 19bb? 390 square inches is definitely in the ballpark. I would probably make it a bit bigger, say about 425, but I know I can build it to about 30 oz easily.
I would also consider raising the aspect ratio slightly. 3.9:1 will be pretty soft in the corners. I would suggest 400-410 square inches and at least 4.5:1 - say a 43" span and a 9.5 inch average chord. Of course we just designed a Flite Streak. which is known to be about ideal for a Veco 19bb or a 20FP.
Brett
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I am flying a 1/2a stunter with a Brodak .049 Mk2. I love the way it flys and want to scale it up for a Veco .19 I nave that needs a home. The !/2a gas a 29" span and a root chord of 7" . I am thinking of going up 140%. That would go to 39" span and a 10" foot chord. Will this be too small for the Veco? I could go to 150% which would be about 43" span.
I never tried to make a ship bigger usually smaller.
Flying Models has a plan for the "Yardbird" stunt trainer with a 36-1/4 inch span. I think it's got a 4.5:1 aspect ratio. The article reports that it flies well, though I haven't tried it.
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Hi Bob,
Back in olden times as some would say.....I built and flew a 620 Sq In plane with a Veco .19 and not the Ball Bearing version either. It only had to do the in-between pattern. of course it only weighed 31 ounces (Light weight building wasn't invented in modern times!) For today's pattern about 400-500 Sq Inches would be about tops in weight for a Veco 19 BB. Oh yeah, there's a plane near that category now that has bee flow a lot with a Veco .19BB or FP .20
That would be the "Dolphin" by Lew McFarland of course..... Well, we solved that problem rather quickly, of course anyone can roll their own as you propose to do!
Jim Pollock
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Humbug! VD~ VD~gets my vote! ;D
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Another very good .19 sized airplane is the Li'l T-Bird!
Jim Pollock, To bad Bob didn't do a Li'l Skyscraper! <=
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I finally found the top of my workbench and have been able to start this project. The Wing is 3/16" thick with a 1/16" lite ply center on the bottom,a 3.16" sq. basswood spar at about 30% chord, and a carbon tissue support on the upper surface. The fuse is 3/8" thock. Here is a photo with the orignal 1/2a next to it.
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I'm not sure what your goal is but as a "Plan B" or next model you might consider just building a Sig Akromaster. It was my first "big" airplane. I went through two of them years ago with a bazillion flights on each airplane, all with the same Fox .19. It's an easy to build model and will fly much better than a sheet wing jobbie. y1
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I knopw there are .19 size kits that fly fine. I had built the 1/2a stunter White Lightning and liked the way it acted on the end of my lines and wondered how it would do if it was enlarged. There have been a lot of plank wing 1/2a's and I am curious how they would fly in a larger size. I also like to build from plans rather tham kits. I am even thinking of reducing a profile Smoothie for an .061. Life is too short not to try spmething even if it doesn't work. Building these planes is fun. I don't fly that well (abript landings) but it is still as much fun as I had 49 years ago on my first attempt. I don't think this will be the greayest stunter out there but it will be one of a kind that I built and will probably be capavle of more than I can do but thats ok.
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I see. Yes, it's a lot of fun just building you own stuff from scratch too. On that note, check out my "Li'l Diablo". I drew up my own rough plan and shrunk down Red Reinhart's original "El Diablo". It' got a Norvel .061 for power and will do the whole pattern with ease on 35' lines.
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I love it. Thats what I like too. I have a lot of different models from plans that You don't see a lot of. There is a 1/2a profile stunter called Dragon Fire I built from free plans in an English mag. Just something you do not see when you go to the field. .
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I love it. Thats what I like too. I have a lot of different models from plans that You don't see a lot of. There is a 1/2a profile stunter called Dragon Fire I built from free plans in an English mag. Just something you do not see when you go to the field. .
I just love seeing models that are not seen often or are unusual in some way. Maybe you could post a picture or two of your Dragon Fire in the 1/2a forum!
Robert
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I suppose that I need to get me a copy of the Skyscraper plans so that I can scale them down to the right size for an FP .20 or Veco .19BB.
Not too sure what that size will turn out to be, but I know it can be done!
Jim Pollock, ;D
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How aboutthis one?
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How aboutthis one?
Biff the football-playing stunt pilot looks like his meat & potato breakfast is disagreeing with him a bit.
That just seems a bit big -- a Nobler is 500-550 squares, 50" wingspan. That thing is almost the same span, and certainly has more than 4/7 of the wing area of a Nobler.
Or do you just build really really light?
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Hey Keith! Ive never seen that one before...reminds me kind of a KA10 meets the Cassut. I also didnt realize that was one of Dons designs. Looks like a shoe in for electric power maybe?
Use the inboard side for air in and the outboard for exhaust.
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Hey John, I see what your talking about. You need to sit down and look through my articles and you find little surprises in them.
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To Airacobra, re: your #19:-
Don Hollfelder's Sirocco (mispelled as you saw, on the plans :D ) has a light, but a bit complicated, fuselage structure. If anyone wants to build one, it's a good idea to get the mag article to understand what's involved. Not difficult, just a bit different.
I think I saw Don fly this at a NATS, if he ever brought one to a NATS. As recalled, it flew well, if that's what it was...
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Look for Dick Sarpolus' Pretender, A .19 sized stunt ship that thinks it's a .35 sized stunt ship! I bought the original from Dick when I came back to the hobby and it worked like a champ with a wimpy Fox .19!
W.
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HI Bob,
When you decide to build a full fuselage stunter for the Veco 19, get the plans for Bob Palmer's Lil' T-Bird. It was designed for the Veco 19 and is a GREAT flying little stunter. And you never see them built anymore.
Big Bear
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What comes to mind here is a Jr. Nobler. H^^ H^^ HB~>
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The Junior Nobler would be too small in my opinion for a .19 size engine. The first Junior Nobler I had back in the 60's was powered with a Cox Medallion .15. It flew great with that engine. This was the kit Jr Nobler. H^^
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I think that while you could try the jr. nobler on a .19 You would have to adjust rpm and prop to get good flights.
I flew my jr. on an old fox 15.
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The problem I see in the Jr. Nobler is getting enough fuel tan in there for a .19. Mine was great with a Fox 15, and just enough fuel.
I still think the Lil' T-Bird is perfect for the Veco .19 y1 ;D
Big Bear
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The Junior Nobler would be too small in my opinion for a .19 size engine.
Certainly too small for a current 19. I can't imagine putting, say, a 20FP in it. Even a 15fp is *way way* too much. It's not way out of bounds for a classic 19 like an OS-20S baffle piston, particularly if you aren't confident about building it to a decent weight. I had one with a 25-s and it flew pretty well for the short time it lasted (and to my limited skills at the time).
Brett
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i wonder if an FP10 (or LA10 for that matter) would work.
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What about the British Keil Kraft Spectre? Designed by Dave Platt, 41" span. Mine flew well with a Fox 19, or the Mercury Monarch, 40" span, both are good looking classic designs.
Cheers Neville
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Hey Bill
What is the wing span of "Bob Palmer's Lil' T-Bird"?
Roger
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Hey Bill
What is the wing span of "Bob Palmer's Lil' T-Bird"?
Roger
Hi Roger,
46", it is a shruken T-Bird II. Originally designed for the plain bearing Veco .19. The semi elliptical tips look great to me! LOL!!
Bill
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I saw this cute profile Smoothie knock off someone is kitting I believe. Todd Lee flew this little bird along quite well at Detroit back in August. Looks good too...a little more stretched than the stock smoothie and higher aspect ratio. Might be just the thing for a Veco 19.