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Old Mar 24, 2012, 09:53 AM
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Idea
Balsa airframe F3P

Hi guys!
I need some input.....I want to know if is a bad idea or good,if i try to make one f3p airframe,from light stick wood balsa and cover with light solar film to one side only!?It will be under 100 gr RTF ,what is your oppinion?
Some one did try in the past!?
Regards....
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Old Mar 24, 2012, 11:08 AM
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It may work, but foam is lighter.

If you did not want to make it out of foam you could make it out of carbon fiber.

http://www.rcgroups.com/forums/showthread.php?t=1158259

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Last edited by Free; Mar 29, 2012 at 10:18 AM.
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Old Mar 24, 2012, 11:26 AM
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Take a good, close look at the Vision 3D. I just finished mine, and AUW/RTF is 102 grams. That's a wing loading of 2.15 oz/sq. ft. for a 32" wingspan!!!!! It flies amazingly slow, as you'd expect and will survive a heck of a lot more punishment than balsa. (I love balsa, use it alot, but not for large aerobatic planes that I fly indoors).

Go to : FeatherlightRC.com
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Old Mar 24, 2012, 11:41 AM
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Ok...I got my answer....If is heavy i give up!
Maibe i will try with 1mm skeleton depron...thanks
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Old Mar 25, 2012, 07:10 AM
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1mm depron =75% of 3mm weight. Use the 3mm and use less
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Old Mar 28, 2012, 07:11 AM
why wont it fly
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http://www.rcgroups.com/forums/showthread.php?t=1378609

i did it with balsa and mylar.

best plane i had untill it had my entire stock of carbon fiber fall off the shelf onto it
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Old Mar 29, 2012, 10:13 AM
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Balsa has been a valid building material for centuries. The full scale De Havilland Mosquito was partially made of balsa. There's no reason why a well constructed stick-n-tissue F3P plane can't be as light and perform as well as one made of high tech materials.
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Old Mar 29, 2012, 11:10 PM
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Quote:
Originally Posted by Trisquire View Post
...
There's no reason why a well constructed stick-n-tissue F3P plane can't be as light and perform as well as one made of high tech materials.
Of course you can build an F3P model from balsa, but there is no advantage over Depron or Carbon and mylar covering.

Jürgen
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Old Mar 30, 2012, 10:18 AM
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Quote:
Originally Posted by Jurgen Heilig View Post
Of course you can build an F3P model from balsa, but there is no advantage over Depron or Carbon and mylar covering.

Jürgen
Wow, that is neat! The balsa plane looks very hard to build.

Do you know the AUW of the Balsa plane?

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Old Mar 30, 2012, 01:16 PM
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Quote:
Originally Posted by Free View Post
Wow, that is neat! The balsa plane looks very hard to build.

Do you know the AUW of the Balsa plane?

Free
Probably not as hard to build as some of the CFK models in this sub-forum.

AFAIK, the weight within the weight range of Depron models, but the IITOP organizers should be able to check the statistics sheets from 2010.

Here is a video:
IITOP 2010 F3P-AP Adam Vomberg (2 min 6 sec)


Jürgen
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Old Mar 30, 2012, 04:52 PM
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Hey Nadine,

If you start a F3P plane, please post pics.

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Old Mar 31, 2012, 07:14 AM
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Adam's plane is nice, but I've got something more minimal in mind. Just a basic flat balsa framework, covered with undoped Esaki tissue on one side only, and then braced with plain old sewing thread. I can't help thinking that it would take less time than milling Depron. Martin's solution would be quicker as well.
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Old Mar 31, 2012, 09:06 AM
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Not trying to defend any method but milling can be pretty quick if you have a good eye and steady hand, and of course, not exactly fair, but if you make good templates then milling is very fast

. On the other hand, in any given size balsa can be much stiffer and at least for the best contest grade wood, probably lighter by a little bit. I built balsa planes for 40 years before I ordered wood from http://www.f1d.biz/ and was shocked at how strong and light wood can be. Its one of those, if you havent tried it, you have no idea deals. But the downside is it would be quite expensive, probably on a par with using CF tubing instead of rod. But thats probably one of those things where perception is a big factor: I've spent MORE than $100 for both my AITO v2 and HEPF Spark, both unmilled depron with pretty minimalist hardware. That equates to 45ft/15m of CF rod, enough for a composite airframe I'd guess.
Right now my first factory milled plane is in the mail, a Techone Yak at $40
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Old Mar 31, 2012, 10:03 AM
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Quote:
Originally Posted by Trisquire View Post
Adam's plane is nice, but I've got something more minimal in mind. Just a basic flat balsa framework, covered with undoped Esaki tissue on one side only, and then braced with plain old sewing thread. I can't help thinking that it would take less time than milling Depron. Martin's solution would be quicker as well.
For my planes I do what Martin does, it is LIGHT, STRONG, and EASY.

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Old Mar 31, 2012, 12:28 PM
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Quote:
Originally Posted by crossup View Post
Not trying to defend any method but milling can be pretty quick if you have a good eye and steady hand, and of course, not exactly fair, but if you make good templates then milling is very fast
I've never tried milling. I'm probably just resisting change.

On the subject of contest wood however, there must be a reason the indoor free flight guys haven't switched to carbon yet.
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Last edited by Trisquire; Mar 31, 2012 at 12:35 PM.
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