"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

1/2a Biplane

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Old 11-29-2009, 10:57 AM
  #26
flyinrog
 
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Default RE: 1/2a Biplane

Oh, wait, is that the one you gave to a friends son and he crashed it?...I remember the pic, not sure of the story...Rog
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Old 11-29-2009, 07:25 PM
  #27
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Default RE: 1/2a Biplane

This little thing makes me woozy. It is the Herr Pitts at Sig , Totally Sweet!!!
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Old 11-29-2009, 07:44 PM
  #28
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Default RE: 1/2a Biplane

That is cool. Do they have ailerons on just the bottom wing?
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Old 11-29-2009, 11:10 PM
  #29
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Default RE: 1/2a Biplane

Idont know, I will check with Mike Lee at Sig.
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Old 11-30-2009, 04:42 AM
  #30
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Default RE: 1/2a Biplane


Quote:
ORIGINAL: flyinrog

Oh, wait, is that the one you gave to a friends son and he crashed it?...I remember the pic, not sure of the story...Rog

That's the one. I don't think he's ever flown it though.
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Old 11-30-2009, 10:52 AM
  #31
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Default RE: 1/2a Biplane

Just ailerons on the bottom wing. Is it that significant if they are large enough?
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Old 11-30-2009, 03:24 PM
  #32
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Default RE: 1/2a Biplane

It's significant if the bottom wing is stalled and the top is not.
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Old 12-03-2009, 10:45 AM
  #33
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Default RE: 1/2a Biplane

Here's an older design. You would have to add ailerons. Scroll down to Schoolgirl.

http://www.selecthobbies.com/kitdata...ly%20RC%20Kits

And there is a Honker Bipe plan.

http://www.rcmplans.com/index.php?ma...oducts_id=1374
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Old 12-03-2009, 11:43 AM
  #34
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Default RE: 1/2a Biplane

Here's one thrown together out of balsa sticks, bamboo skewers, cellophane covering, Spiderline controls....based on the Ultimate Bipe.
The flat bottom airfoil was an experiment to see if it would hold it's place in the sky better during upright flat spins and tumbles....it does pretty well.

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Old 12-03-2009, 12:31 PM
  #35
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Default RE: 1/2a Biplane

Quote:
ORIGINAL: skaliwag

And there is a Honker Bipe plan.
Yeah - the Bipe came out shortly after the original Honker and used the same wing (if you had built a Honker, your wing construction was already half done ). The plans called for a .15 to .25 - it would fly fine with a .15; with a .25, it was "sporty" to say the least.

There was an even later offering by Dave Thornberg (designer for the Honker series) called the Honker Rocket which was used for some class racing. It was essentially a Honker with the fuselage cleaned up a bit.

All three planes used a Jedelsky airfoil making them some of the original SWR's.

andrew
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Old 12-14-2009, 03:56 PM
  #36
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Default RE: 1/2a Biplane

I am thinking of a 1/2 a bipe using one set of ace constant cord foam wings I had.
After you add ailerons, they come out to a six inch cord, and each section is 18 inches long.

I noticed this is the correct cord and wingspan for a scaled down Bill Warwick "hot canary",
which is a negative stagger racing bipe. I found some planes on line for a 30'' span version for American Modeler Magazine and scaled those down.

(Top flight did one at about 36 inch span for a .40)

18 inch span looks crazy small, but it is about the same proportions as the top flite sized one, and that flew ....

It would be so simple to use the molded foam wings as they are, in their 18 inch sections.

What do you think?

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Old 12-14-2009, 04:22 PM
  #37
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Default RE: 1/2a Biplane

The ACE Simple Ultimate uses those wings. My Bipe Stik uses lighter foam copies of the same wing.
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Old 12-14-2009, 04:44 PM
  #38
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Default RE: 1/2a Biplane

Bipe flyer

Yes I saw the wire-cut reproductions of the ace molded wings.
I am familliar with the ace bipe that used them too - that was for a .10 or .15
What is unique abaout the bipe I am proposing is that it uses only one set, unjoined, so it would have about 200 sq inch wing area, the same as the simple series ment for 1/2a's.

So it would be an 18 inch span negative stagger bipe for 1/2a.
I'll try and frame someting up and post it ...
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Old 12-14-2009, 04:56 PM
  #39
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Default RE: 1/2a Biplane

Oh, I see what you mean. I would have thought the Hot Canary would have a narrower, longer wing than that. From looking at a 3 view a 6" chord would be a 28" span.

I built I bipe using the panels as you described, makes for very fast roll rates.
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Old 12-14-2009, 05:11 PM
  #40
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Default RE: 1/2a Biplane

Thats it !!!!!!!!

Thrue, 6 x 18 inch doesn't scale from that drawing of the actual plane. I scaled it from a .40 size published in American Modeler magazine - take a look

http://www.rcgroups.com/forums/showt...ght=hot+kanary

Which cox engine/prop is that? I have a norvel big mig .049 I was thinking of using.

Regarding the fast roll rate, the .40 size I am scaling from had ailerons on the bottom wng only, which I think I would do too, for such a short span.

Thanks so much for posting your bipe, it really encourages me to give it a try.
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Old 12-14-2009, 07:52 PM
  #41
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Default RE: 1/2a Biplane

At first I thought they shortened the wings in the drawing for space, but when checking the scale indicator against the chord on the side view of the fuselage, then using that to calculate the span and scale it to 18" without the wing tips, you get a chord of 6". I've never seen a Hot Canary with wings that short.

The engine is a pre-Revlite Norvel AME .061 with an APC 5.7X3 prop.

To be perfectly honest that wasn't my best design. The aspect ratio of the wings, thick airfoil and having 2 of them made for a very draggy plane.

I prefer ailerons on both wings because you can run into a situation where one wing is stalled and the other is still flying, especially if you use different incidences on each wing. For example, it's not uncommon to put the bottom wing at a few degrees relative to the top wing - if you get slow or at high AOA the bottom wing can stall while the top wing has not, giving you no aileron control. In the case of the Hot Canary, it's actually preferable to have the bottom wing stall first because, as it is the forward wing, the CG would shift forward, dropping the nose and building up airspeed. Of course things like stagger and using different airfoils on each wing change the stall characteristics of each so I just stick to zero incidence for both wings and ailerons on both. Also, I believe that rolls are more axial when your control surfaces are not so far offset from the centre line of the plane.
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Old 12-18-2009, 08:17 PM
  #42
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Default RE: 1/2a Biplane


Hello all,

Well I am finally home for about two weeks!! Will retire to the basement soon and start cutting balsa and building 1/2a like I do every year. I really appreciate everyones plans that were posted, I plan on building the Jn-4, Waco, Bandito and the Niewport. I love 1/2a, probably because most of my young life I got a Cox P-51 control line for Christmas every year and I flew it until the wings broke (really)!

Hope everyone has a great break however long it is (I used to get no break, finally seniority has caught up!) Build some planes to fly this spring, life is short, enjoy what time is left.

Thanks,

Honker1
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Old 12-19-2009, 12:10 PM
  #43
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Default RE: 1/2a Biplane

I was lookingfor a similar project for my building season. I`m having a hard time trying to find anything at all from clancy aviation. I really wanted to downsize their bipe to an .010 or .020 size. I would settle for a ladybug or yard bee though in case anyone runs across anything, or knows anyone, etc.
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Old 12-19-2009, 06:41 PM
  #44
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Default RE: 1/2a Biplane

I tried to find one too and finally gave up and drew a partial plan.

Just let me know what file format you want and shoot me your email address.
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Old 12-19-2009, 09:54 PM
  #45
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Default RE: 1/2a Biplane


Quote:
ORIGINAL: Trinut

18 inch span looks crazy small, but it is about the same proportions as the top flite sized one, and that flew ....

It would be so simple to use the molded foam wings as they are, in their 18 inch sections.

What do you think?
My low wing monoplane with one 17" piece of ACE wing and an .049 works fine, and glides really well. So single pane; ACE wing things are feasible, yes.
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Old 12-19-2009, 10:16 PM
  #46
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Default RE: 1/2a Biplane

Quote:
I was thinking a loose Jenny, SE5 , Moth. Slow, light....
I can help you out with an SE5, a 1/10 scale version at about 30 inch span, motor shown is a Mills 1.3 diesel.

PM me if you are interested. - John.
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Old 12-19-2009, 10:22 PM
  #47
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Default RE: 1/2a Biplane

Other plans for small engines I would never build, but would be a shame to throw out are:

Farman Moustique, for a 25 size engine.

Short Skyvan, engines shown are two Medallion or Tee Dee 049's.

D.H Moth minor for 20 size engine.

Luscombe Silvaire, 15 to 20 size engine.

Not 1/2 A, but I'm not likely to build a 40 size Fokker EIII either, who wants it?

John.
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Old 12-19-2009, 10:31 PM
  #48
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Default RE: 1/2a Biplane

Aeromodeller plans which I no longer have but you may be able to trace are the Bristol Scout, Sopwith Triplane & Nieuport II.

These were all free flight plans, all sheet construction, so simple to build.

I tried them free flight with Babe Bees, the Scout was a good flyer, the Nieuport not so good.
Never got around to the Triplane. - John.
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Old 12-19-2009, 10:39 PM
  #49
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Default RE: 1/2a Biplane

Whoa! Just dug out a couple more, designed for electric but convertable:

Bristol Beaufighter, my guess, for two 10 size engines, hand launched.

Sopwith 1 1/2 Strutter, designed for a speed 600, a 20 to 25 would do the job.

John.
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Old 12-20-2009, 12:03 AM
  #50
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Default RE: 1/2a Biplane

well if you don't find anything from now to march check out the cpaa.us website and see about the biggest flea market down at the lebanon fairgrounds in march i'll definately be there
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