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Old Jun 29, 2012, 03:00 AM
why wont it fly
south africa
Joined Jan 2006
221 Posts
Discussion
All balsa F3P take two, geodetic airfoiled wing

Hi everyone,

inspired by my previous balsa F3P ship that was 92g flying with a 240 2s lipo, i decided its time to push it as far as i can:

DT RX40 is less than a gram for 7 channels
5gram blade mcpx 11000KV motor geared to drive my 10.5x3 balsa composite prop.

i am aiming for 75grams flying weight.

so far the prop, its hub, bearing carrier, pulley and shaft weigh in at 3.9 grams, this is less than my std carbon props.

airframe is +- 900 long +- 850 span
concep so far.
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Old Jun 29, 2012, 08:21 AM
RC Bum 4 Hire
ChrisBowker's Avatar
United States, NM, Albuquerque
Joined May 2004
1,150 Posts
Beautiful work on the prop! thanks for sharing the pics, please keep them coming.

Chris
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Old Jun 30, 2012, 08:52 AM
Inspired by the wings of an An
Andycap's Avatar
Leeds
Joined Mar 2003
1,942 Posts
Prop is a proper work of art Dylan. F3P bling!
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Old Jun 30, 2012, 04:06 PM
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steve gerrard's Avatar
United Kingdom, England, Amesbury
Joined Mar 2009
14 Posts
wow real nice work on that prop cant wait to see the plane, watching with intrest
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Old Jul 05, 2012, 08:54 PM
Fly for God, not for the World
Not Free's Avatar
United States, CA, SF
Joined Sep 2011
140 Posts
wow!! that prop is wicked (in a good way)

Keep us posted on the plane please!!
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Old Jul 06, 2012, 02:23 AM
why wont it fly
south africa
Joined Jan 2006
221 Posts
Thanks for the comments guys, should be getting the wing ribs Laser cut this weekend, not sure if the motor from HK will be here on time so might end up with my Microdan.

will upload more pics next week
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Old Jul 08, 2012, 11:38 PM
why wont it fly
south africa
Joined Jan 2006
221 Posts
some updates, the fuse is 11grams, its almost a meter long.

just pieced bit of the one wing together last night
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Old Jul 10, 2012, 01:18 PM
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Joined Jun 2008
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Great and very inspiring work, keep it comiing please!

greez

chris
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Old Jul 10, 2012, 10:32 PM
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Joined Oct 2006
18 Posts
Looks great!! Hope to see more pics as you progress....

I'm curious to see how you hinge the ailerons.
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Old Jul 11, 2012, 12:07 AM
why wont it fly
south africa
Joined Jan 2006
221 Posts
thanks guys,

i have overshot my goal weight on the wings and my lightweight equipment has not arrived yet, so it will me a more coventional 2cell setup. i guestimate 100 odd grams.


aileron root is driven directly by the servo and the tip hinges on a pin, rest just floats.

wings were 4.5 grams each without sheeting, sheeting added 4.5

next time i wont sheet them, this structure is plenty strong enough without it.

1 wing and its aileron are at 14g so far.
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Old Jul 11, 2012, 07:41 AM
slow but inefficient
Ron Williams's Avatar
Riverhead NY USA
Joined Dec 2000
3,097 Posts
This is going to be a hangar rash nightmare.
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Old Jul 11, 2012, 07:51 AM
why wont it fly
south africa
Joined Jan 2006
221 Posts
Ron, thats what happened to my previous one

but the mylar makes a pretty decent trash bag to keep all the broken balsa in

im already planning the next build. i REALLY want to get the 75gram flying weight. our comp is this saturday so im rushing this
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Old Jul 11, 2012, 11:32 AM
slow but inefficient
Ron Williams's Avatar
Riverhead NY USA
Joined Dec 2000
3,097 Posts
Good luck!
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Old Jul 15, 2012, 12:50 PM
Registered User
Joined Apr 2005
125 Posts
I saw it fly yesterday at Hatfield Church and must say impressive

what did you cover it with?

you should post some pics of it completed while it hasn't been damaged yet



Great building btw
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Old Jul 16, 2012, 12:05 AM
why wont it fly
south africa
Joined Jan 2006
221 Posts
Well, after a full friday marathon build up to 5am on Saturday morning (thanks for the help Dad) i had it ready to fly.

i missed my design goal of a super lightweight builtup, but i learnt quite a bit in the process.

Model size:
980 long x 860 span
20% NACA airfoil section

120grams flying weight including battery.


i did not end up running the balsa prop, none of my single cell equipment arrived yet. aerie ended up way to heavy for that anyway.

flying wise i am super happy with the airfoil, amazing low speed characteristics and no tip stalling on sharp pullouts. Microdan 1700 KV swung the 10.5 inch prop no problems. rolls were VERY lazy and i think it will need some changes to the airfoil to sort this out.

all in all, pleased with the outcome, and inspired to push my skills yet again, i want that 75grams

Midrian, i ended up using 1micron mylar bonded with 3M 77 spray contact. the glue is a heavy solution, i will look at alternatives next time or perhaps tissue covering instead.
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