Replies to This Discussion

3D RoboticsPermalink Reply by Chris Anderson on August 16, 2008 at 6:55am

I've got one but I wouldn't consider it a good candidate for autonomous flight. Too squirrely and easily buffeted by wind. I agree that it's easy to hang things off it, but there are other sticks with better wings that fly better and would be a better candidate.

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Permalink Reply by David Low on August 16, 2008 at 9:21am

hi Chris,

Which stick in your mind is good enough for autonomous flight?

previously, i thought of using slow stick as i have seen several successful cases of slow stick modded for aerial photography use.

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3D RoboticsPermalink Reply by Chris Anderson on August 16, 2008 at 10:28am

This one is better, in my mind

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Permalink Reply by Wyliest on August 16, 2008 at 2:36pm

I have one home designed airframe that I would be happy to post, but it isn't as complete as it showed to be. More over i don't know format to post it in. Can I just post hand sketches and photographs of what I've got?

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Permalink Reply by Wyliest on August 16, 2008 at 2:45pm

I can post what I have in google sketch up form if any one can read it?

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3D RoboticsPermalink Reply by Chris Anderson on August 16, 2008 at 2:52pm

It's best if you post both a jpg/png (so everyone can see it) and also upload the google sketch file.

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Permalink Reply by Wyliest on August 17, 2008 at 3:44am

this is what i have so far.To up loading of this just make the wing longer.The center of lift is about 3" behind the leading edge.

Fuselage
-3/16" foam core board
-fiber packing tape
Wings
-3/4"x1/2" leading edge
-2" trailing edge
-2" sheet of styrofoam cut to profile
Motor mount
-1/8" plywood

The first file google sketchup.

Attachments:

• airframe1.skp, 285 KB
• 0817080327.jpg, 408 KB
• 0817080327a.jpg, 405 KB

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Permalink Reply by Jelle on August 17, 2008 at 3:15am

If you are look ing for stable and cheap airframes, head over to the scratchbuilt foamies section at rcgroups. the best thing would be to go for a trainer-like plane, but with a full fuselage to stuff the gear in. The blue-baby springs to mind, but others might be suitable too. If you don't mind stuff hanging in the breeze, a upsized Trainer1 might work too.

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Permalink Reply by Roger McClurg on August 18, 2008 at 1:32pm

I agree with the Blue Baby. In particular the Blue Baby AP1 with a 60 inch KFM3 wing. It is easy to build, strong, and provides plenty of room and carrying capacity for hardware. I can attest to the KFM3 wing's stability, load carrying capability, and stall capability.

Here are some PDFs. THere are more to be had at the site.

Attachments:

• BBAP1 KFm3 Wing Assembly Instructions.pdf, 43 KB
• BBAP1 60 in KFm3 wing parts full.pdf, 49 KB
• Blu Baby AP1 Fuse Parts full.pdf, 39 KB

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Permalink Reply by Wyliest on August 19, 2008 at 11:24pm

I am having trouble picking the right size of motor for my project. I mean electric, but am not opposed to gas.

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ModeratorPermalink Reply by Sgt Ric on August 20, 2008 at 6:16am

Thanks to innovations in the tech field because of the need to improve computers (especially laptops), the electric motors and batteries (Lion and LiPo) of today are equalls in many ways to combustion engines.

After 30 yeras of flying with alcohol and gasoline based engines (and regarding electrics as "toys"), I now fly exclusively with electric motors.

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Permalink Reply by Jelle on August 20, 2008 at 4:47pm

that is not that hard if you use the watts per pound rule:
50 watts/pound for sedate flying, 100 for 'sporty' flying, 150 and up for acrobatics and 3D.
There is a correlation between the weight of the motor and the amount of watts it can absorb, but I forgot the rule of thumb for it.

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