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Old Jan 17, 2005, 04:33 AM
Graham Smith is offline
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My new chariot car powered Bit Bipe


Here is the final version of my new bipe which flys really well now, using the radio from a ‘Chariot’, bit car. It’s 18” span and weighs 11.2 grams. The only mods iv’e done are to increase the RX aerial length and double the transmitter aerial length. No mosfet has been fitted as the model is quite spritely. Its great fun practising ‘touch and goes’ on a picnic table, or the roof of a car. It will land with hardly any forward speed, if a blipping motor technique is used and it sort of parachutes down.
It’s mainly made of traditional building materials. The wings are removable for transport and for tweaking of the incidence angles. I have used dried grass for the plug in and variable pitch and diameter prop blade tubes, also the wheel bearings and the plug in tailplane tubes.
It would probably fly without the bottom wing, but I would guess it would need some motor downthrust to fly properly.
Recently the motor (from a chariot car) started to loose power so I replaced it with a, 4.5 ohm one. I happened to be checking the motor I had taken out and found the pinion gear was slipping on the shaft. So I glued it back on again and and put the original motor back in the model again.

The idea behind building a biplane was to have more wing area and reduce the wing loading over an earlier monoplane bit plane, but I am not sure if the biplane flys any better, because I have read that 15% or so, of an aeroplanes drag is produced by the wing tips, and a biplane has two sets of tips!. I havn’t been able to directly compare the two types of plane, because the motor/radio combination used in the ‘Chariot car’, set up produces considerably more power than other types of ‘Bit car’ radios that I have used.

Here are some plans for those interested, which includes much more information and plenty of hints and tips on construction.

The other Graham
Last edited by Graham Smith; Jan 17, 2005 at 05:07 AM.
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Old Jan 17, 2005, 04:39 AM
Graham Smith is offline
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I'm not sure what's happened with the pictures? There is only an icon. They are jpg's the same as I normlly use.

Sorted, Seems OK now.

Here is the thread for my first bit plane. It's a 26" span monoplane (Moth) and plan:
https://www.rcgroups.com/forums/showthread.php?t=117583
Last edited by Graham Smith; Nov 01, 2005 at 03:45 AM.
Old Jan 17, 2005, 05:14 AM
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More pictures
Last edited by Graham Smith; Jan 17, 2005 at 05:33 AM.
Old Jan 17, 2005, 05:15 AM
NitroCharged is offline
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Sweet little plane Graham. Well done!
Old Jan 17, 2005, 05:33 AM
snakeX2 is offline
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Magnificent!!! Might try one when i actually get some free time. Thanks for this goody!
Old Jan 26, 2005, 05:39 AM
ilaurencet01 is offline
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thx buddy for the pictures because without them I couldnt fix my reciever which the cords were mixed up so I ended up resoldering the way your setup is and it worked. thanks a million.

Isaac
Old Jan 26, 2005, 12:25 PM
66tbird is offline
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To many projects
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Nice The close up pictures are sure a good teacher. I've got a way to go to.
Old Jan 26, 2005, 12:35 PM
RCypher is offline
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How do you steer it?
Old Jan 27, 2005, 03:33 AM
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Cypher,
It's steered by an actuator mounted remotely from the rudder placed just behind the wing, and connected to the rudder by invisible thread, (as used in dressmaking). It's barely visible in the first photograph. The thread to the rudder can be just seen in the close up photo of the rudder. The plans make it much clearer how all this is set up.

The other Graham
Old Jan 27, 2005, 05:16 AM
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Graham

That is one of the prettiest stick planes I have ever seen.
It is a good weight too. I bet it flies really slow.
Thanks for sharing and posting plans.

Billy
Old Jan 27, 2005, 07:11 AM
epilot is offline
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Graham, very nice model. Would you say it can be comfortably flown in a 15'x15' room?

Michael
Old Jan 27, 2005, 08:18 AM
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Michael,
nice to see you are still posting.
My home made actuator doesn't centre very well (no centring magnet) so it tends to turn tighter to the right than to the left. I would say it turns in about 15' circles to the right and wider circles to the left. With perhaps a bit more dihedral and a better actuator I think it could be made to turn a lot tighter

The other Graham
Old Jan 27, 2005, 09:21 AM
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Thats a very nice plane indeed. Thanks for sharing your plans so freely. I think i'll dig up one of my old chariots and build one. I was also thinking that you could probably make on heck of a rogallo wing out of these also.


Greg
Old Jan 27, 2005, 06:35 PM
mybitplanebitme is offline
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are u useing the original steering motor for steering or did u use an actuator? if u used the motor id love to see a picture of how u riged it

thanks,
the Ari from the OC
Old Jan 27, 2005, 07:21 PM
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Ari, you should consider reading the posts before asking questions:

Quote:
Originally Posted by Graham Smith
My home made actuator doesn't centre very well (no centring magnet) so it tends to turn tighter to the right than to the left.
Michael


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