"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 01-10-2010, 03:55 PM
  #76
Jaspur_x
 
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Default RE: 1/2a Biplane

1 more stupid question guys , what is the advantage of staggering the wings?
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Old 01-10-2010, 04:03 PM
  #77
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Default RE: 1/2a Biplane

Jaspur, the designer of Rollin' Foam said the when the engine quit the plane glided like a shot pigeon.

Putting the wings closer together increases the interference between the two wings and is inefficient, so it would reduce the L/D. Lengthening the wings generally improves L/D, especially on a bipe because so much is lost at the four wingtips.

I also think the airfoil was too thick on that foam wing to be efficient on a small bipe like this. I think Ken Willard had a better design (see Cannonshot in another post, above) using a very thin airfoil. But he used a stubby wing and a pretty marginal gap between the wings. I think a little higher aspect ratio would be better.

I don't think it will help to taper the wings on a small plane like this. It will be PLENTY maneuverable, and I don't think you'd get noticeable drag reduction. But you might get tip stalls.

Have fun, and show us what you come up with.

Jim
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Old 01-19-2010, 10:25 PM
  #78
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Default RE: 1/2a Biplane

OK , I built an undersaddle wing bracket and second wing for my little " farce plane "
I just put polyeurothane on it and am waiting for that to dry so I can paint it. I didn`t feel like covering it ,after all it is held together mostly by the wing dowels.
I will post some pics after the paint is dry.
The big question will be throttled peewee 020 , teedee 020 or G-mark030....call me a panzy but I like throttling back from time to time........decisions decisions lol
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Old 01-20-2010, 11:07 AM
  #79
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Default RE: 1/2a Biplane

About 4 years ago I came across a Beechcraft Staggerwing for .049 plans on Ebay. Since Staggerwings are something you don't see everyday I purchased the plans and since I am into .15 - .25 glow I went to Kinko's and enlarged the plans. After modifications to the Wings, airframe and control areas I ended up with a nice little Staggerwing that draws a crowd when I fly it.

If some one wishes a copy of the plans I can check with kinko's on the cost to duplicate and ship.

The orig plans call for a:

32" wingspan
28" overall length
290 Sq inch wing area
.049 - .08 glow.

Larry

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Old 01-20-2010, 07:36 PM
  #80
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Default RE: 1/2a Biplane

Nice job! How much did you blow it up? Model Builder had a Staggerwing for .25 also, with a 40 inch span, I think. Designer did several plans for MB, all for .25s, and at least 3 were bipes. I'd forgotten those till I saw your Staggerwing. Northrup still has the plans.

Jim
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Old 01-20-2010, 08:17 PM
  #81
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Default RE: 1/2a Biplane

Beautiful , simply beautiful!
How does she fly?
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Old 01-20-2010, 10:26 PM
  #82
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Default RE: 1/2a Biplane

I enlarged the plans 130% at Kinko's (I think) to get a final wing span of 38".

If I had to do it all over again I would have made the alerions on the top wing or linked both top and bottom together.

It flys nice but with the ailerons on the bottom wing I dont get very much control out of them. If you want to do a roll you better be 6 mistakes high.

Takeoffs are good, I fly off grass and if it is too long it will want to nose over on takeoff and landings.

I have a Magnum .15xls with a 8 x 4 prop.

I searched high and low for a cowl and found a vinegar container that fit just right. I modified the bottom and top wing so they are both removable and the struts slide and lock in to top and bottom wings without any type of screws.

With my use of spruce for the top and bottom wing spars and in some locations of the fuse, it is a tough little plane. During my first maiden flights It took me several attempts on the take offs, as I was trying to pull up too soon and tip stalls several times. It just cartwheels down the flight line and hasent done any damage to tail or wings.

I have about 2 dozen flights on it and no repairs so far

It does attract attention at the field.

Larry

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Old 01-21-2010, 09:57 AM
  #83
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Default RE: 1/2a Biplane


Quote:
ORIGINAL: Honker1
Really want to build a 1/2a Biplane. Any ideas. Might design one and build it. Any thoughts?
You might try a Scoundral with an extra wing kit, I think it would make a killer biplane.
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Old 01-27-2010, 07:20 PM
  #84
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Default RE: 1/2a Biplane

OK guys , I finally did it , I ordered a true bipe kit , not just one of my conversions , a true bipe , actually two. ( Don`t pick on me guys , I can`tbiuld good enough from scratch or plans for my tastes)

I went with radical r/c`s das mini bipe ( for my son), and the micro bipe for me of course.

I think I will throw up some progress pics when I get it going.


I still have to get pics of my littlest stick bipe on here too..
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Old 01-27-2010, 08:34 PM
  #85
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Default RE: 1/2a Biplane

...
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Old 01-31-2010, 07:35 PM
  #86
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Default RE: 1/2a Biplane

I cant find it on the net anymore but hobby lobby has a small 27-30 wing span tigermoth arf electric. its is about 10 ounces as electric. its all wood with a plstic covering on it. I have one and going to put a dang for the name of it now but i think its a wasp .049 with throttle on it. keep it all stock and big prop to kee power down. i dont kow if its a good engine or not. i know it seems light but it will handle the engine with just a bit of work to the engine near the fire wall. i will get a pick of it tonight. it was made by Green models. very good arf for 60 bucks i wish i had more of them. also something to look at for fun is hobbly has two small foam nemesis's. the larger one would be perfect with .5 ounce cloth and a hot 1/2 A
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Old 02-01-2010, 02:42 PM
  #87
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Default RE: 1/2a Biplane

ok i went and took some pics that little engine now look very large next to the plane lol so maybe something smaller would be good or limit throttle to half.
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Old 02-01-2010, 02:54 PM
  #88
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Default RE: 1/2a Biplane

It dosen't look too big to me

In fact it looks like you could go bigger

Maybe a Norvel .061.

larry
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Old 02-01-2010, 06:08 PM
  #89
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Default RE: 1/2a Biplane

That's a Norvel in the picture. What is stamped on the left side of the crankcase?

If it's too much power, use the throttle.
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Old 02-01-2010, 09:12 PM
  #90
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Default RE: 1/2a Biplane

Here are my littlebipes
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Old 02-01-2010, 09:14 PM
  #91
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Default RE: 1/2a Biplane

2nd try
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Old 02-01-2010, 10:38 PM
  #92
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Default RE: 1/2a Biplane

I cant remember what brand it is i have the box in the garage somewhere. I really think that one is a brodak. also its a .061.
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Old 02-01-2010, 10:45 PM
  #93
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Default RE: 1/2a Biplane

I like the red and yellow .020 bipe. Looks like an oversize prop on the little Cox. Has it flown? Tell us more...

Jim
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Old 02-01-2010, 11:50 PM
  #94
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Default RE: 1/2a Biplane

Buzzardbait,
Well , it started out as a 75% version of a clancy aviation ladybug , and I`m not very a experienced builder , only once built from plans once before.
Which was of course the clancy aviation littlest plane that could. ( a balsa sheet fuse)
So I looked at the plans for the ladybug , wanted it smaller , and photocopied it down to 75%
got some sheets of balsa and ome 1/8 sq. stockout and started making termplates and building.
after I got the fuse done , and got donescratching my head about the fuse plans I decided to look onhere and see if anybody else had ladybugs.

Sure enough , there were some , and their fuselages were not sheet fuse sides. Then Ido not like the wingtips on clancyplanes, I like sheet tips , so I made sheet tipssimilar to the clancy tips shape.

I decided to build 2 wings , the second would be with a longer span , and havesome polyhedral.
I builtwith the " that looks about right" ruler , and , well , that finished wing looks like about twice the angle I wanted but what the hay.

Then ?I decided since this was sucha "farce" of a ladybug , I`dbuild a undersaddle to make it a bipe convertible , cuz what the hay.

I have not even flown it yet , I`m waiting for my G-mark 03 to come back fromthe shop, I sent it out for mods

I just threw the peewee020 on it and thats a 6x3 topflite prop just for the pics sake.



The other is a modified version of the Fred Reese littlest stick.
That one was simple, I just added an inch height to the fuse sheets , kept the nose square with the bottom fuse line , squared off theleading edge and trailing edges and cut the top profile ofa wing rib out of the fuse bottom, instant bipelittlest stick.
No , I havn`t flown that one yet either.

Jared
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