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Fastest Scratchbuilt Bipe?

Old 07-09-2010, 12:30 PM
  #1  
Numbthumbs
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Default Fastest Scratchbuilt Bipe?

HI all,

I am in the process of looking for plans for a foam Bipe that should (hopefully) be able to handle 4S (35C 3000Mah), a 35-42 SK (or 35-48) motor and will be fitted witha 9x6 or 10x7 prop (depending on motor) for 700-1000Watts and a pitch speed of about 75-80Mph. With drag, etc...probably 60mph more realistic. I don't want to build a balsa kit either, it can have some balsa bits, but more depron/foam board, etc...

I know bipes are not built for speed, and I am not looking for the fastest foamie, just a bipe that is smoking fast, and very sporty. 3D is not a main interest for me, though most bipes will be somewhat 3d capable due to their design.

According to Webocalc, with 4S, a 9x6 prop, a weight of 1200 grams and a wingspan of 33", this plane would fly very well and have a stall speed of about 14 mph.

I was wondering if there exists a bipe in the foamie section which is capable of this power already? A search did not yield one. I may just have to make my own


Thanks in advance
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Old 07-09-2010, 06:14 PM
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Sky Sharkster
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Default Built For Speed?

Hello Numbthumbs,
I don't know of a plan source, but my guess for a design would be something along the lines of the "Pitts Special", "Steen Aero" or "Smith Miniplane" might be the way to go. They are streamlined with fully-cowled motors, wheel pants and (I believe) both have slightly swept upper wings.
Perhaps a cabin style fuselage would offer less fuselage drag also, there are several bipe designs with the top wing mounted directly on top of the fuse, instead of struts.
Good Luck!
Ron

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Old 07-09-2010, 06:22 PM
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C140
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Not sure if this will help, but I found some foam Hiperbipe plans. At current conversion they're $6.30.

http://www.rcplans.nl/catalog/produc...d2d88672658f88

I guess the real thing can really get on its horse.
http://en.wikipedia.org/wiki/Sorrell_Hiperbipe
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Old 07-09-2010, 06:42 PM
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Numbthumbs
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Originally Posted by Sky Sharkster View Post
Hello Numbthumbs,
I don't know of a plan source, but my guess for a design would be something along the lines of the "Pitts Special", "Steen Aero" or "Smith Miniplane" might be the way to go. They are streamlined with fully-cowled motors, wheel pants and (I believe) both have slightly swept upper wings.
Perhaps a cabin style fuselage would offer less fuselage drag also, there are several bipe designs with the top wing mounted directly on top of the fuse, instead of struts.
Good Luck!
Ron

Thanks for the tips, I shall post the results! I know this, it won't be pretty lol, but it should fly...

Edit- @c-140 you posted as I was posting, the links are good. Interestingly enough, the rough plans I have for my bipe are pretty equal to that of the sorrell, scaled down of course!
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Old 07-09-2010, 07:25 PM
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Ok, here is what I accomplished today. I am calling it Frankenbipe, because that lower wing has survived 6 different foamies and those hinges from hobbyking look like stitches lol...

The foam is about an inch thick, tough as nails, and the total weight now, with motor and without electronics is about 550 Grams. Wingspan is 83cm (33inches) and length is 78 cm (about 31 inches or so)

If all goes well, it should be about 1100 Grams AUW and according to Webocalc, it will have a stall speed of 13 mph, and a speed of 70mph+ and fly like a trainer. It will have 700-1000 Watts of power for about 330+ watts/pound!

The elevator, ailerons, and tiny rudder are made of 6mm Depron. The plane is ugly, I know, but as soon as I test fly it, I can rebuild and paint it up nice. Frankenbipe updates forthcoming!
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Old 07-10-2010, 07:50 PM
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Well, I was able to spend a few hours on her today and finish it up. All electronics hooked up, servos aligned, ESC programmed, motor hooked up and watt tested. Here is the result of the Watt Test:

52A @ 853 Watts with the 9x5 TGS Sport prop. I have throttle adjusted it down to 45A max. Still gives me over 300W/lb and I am going to maiden it tomorrow with a video. More info to come!

AUW is 1100g (38.6oz) with the 2600mah 30C 4S battery, and 1155g (40.5oz) with the 3000Mah batteries, also 4SS 30C. According to Webocalc, it will have a stall speed of about 12mph. Will post up the vids tomorrow!
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Old 07-10-2010, 08:02 PM
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Big Johnny
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one of the fastest bipes of all time is the Mong.

http://www.google.com/imgres?imgurl=...:1&um=1&itbs=1
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