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Old Nov 27, 2012, 08:14 PM
I'd FPV it.
Ho-Jazz's Avatar
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Leave the film on both sides of the foam like pecan said. If you have enough foam, do the kfm for sure. It will make the front much stiffer.
Good luck on your build! Can't wait to see the finished pics.
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Old Nov 27, 2012, 08:34 PM
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Mud Duck Bill's Avatar
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Ho Jazz
The pink foam is thicker than the blue and I was thinking of this KFM thing and is it going overboard to do both sides. The bottom in pink and the top in blue.

Bill
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Old Nov 27, 2012, 08:47 PM
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pecanpatch's Avatar
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Originally Posted by Mud Duck Bill View Post
Ho Jazz
The pink foam is thicker than the blue and I was thinking of this KFM thing and is it going overboard to do both sides. The bottom in pink and the top in blue.

Bill
it should be very close to the same thickness
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Old Nov 27, 2012, 09:16 PM
I'd FPV it.
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The stiffest GB that I have built so far had 3 layers of the 1/4" FFF (fan fold foam). The main wing and then a "two step" of the KFM. This makes the nose of the craft 3/4" thick and helps a lot with rough landings. If you look back at page one of this thread, you can find pics of the KFM that pecan came up with and a few of us have built. I also have a few pics of a 30" GB that I built on the first page. Keep asking questions here...we will help... Then your GeoBat will be all it can be!
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Old Nov 27, 2012, 09:53 PM
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Thanks guys can't ask for any more than that!!

Bill
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Old Nov 27, 2012, 10:15 PM
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Bill,
This was a older GeoBat that needed repair and I added a KF airfoil to it. I like to do them 1 piece like this is for added strength. Later I add the front Fuselage pieces.
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Old Nov 28, 2012, 11:44 AM
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Ok fellas: at the moment I only have one good leg to stand on, so time standing at the bench is limited at best. The gluing up of the halfes and the under belly section came out nice. I cut out a one piece KF air foil for the top and winglets to fill in the same shape for the bottom. (What does KF stand for?) . Question the ailerons inside the body are cut into the body material or are they cut from scrap and added on to the body? I am leaning toward elevons! Now it seems I have to wait for the pony express guy to bring me my carbon fiber strips before I can glue any more. In the mean time if you think of any thing I should do while I wait let me know and as always thanks for your help!

Bill
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Old Nov 28, 2012, 11:46 AM
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Winglets !
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Old Nov 28, 2012, 11:57 AM
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The blue FFF has become hard to get around here Lowes use to carry it but now they have there own and is perforated with compression marks and flimsy. Home Depot has the pink it is bit thicker and more ridged I like it. FYI

Bill
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Old Nov 28, 2012, 12:10 PM
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The blue FFF has become hard to get around here Lowes use to carry it but now they have there own and is perforated with compression marks and flimsy. Home Depot has the pink it is bit thicker and more ridged I like it. FYI

Bill
The pink is almost 50% thicker
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Old Nov 28, 2012, 12:42 PM
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The pink is almost 50% thicker
Man, when did they do that? My pink and blue stacks are nearly identical in thickness.

The inner ailerons are added... Not cut from the wing.
They are a pain to get to work in unison with the outer ailerons.

For your first foamie , I wouldnt mess with them. But you can add them later easily enough.

If you were gonna do elevons you wouldn't of cut the flat at the rear of the wing (for the elevator)

KF is initials for Kline Fogelman who first started experimenting with these stepped airfoils years ago.
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Old Nov 28, 2012, 01:19 PM
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I was thinking of using the same setup as in the last video on post # 65 what are your thoughts on that set up?


As for the foam the blue around here was made by Dow, the pink was by the pink panther O/C

Bill
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Old Nov 28, 2012, 02:03 PM
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I was thinking of using the same setup as in the last video on post # 65 what are your thoughts on that set up?


As for the foam the blue around here was made by Dow, the pink was by the pink panther O/C

Bill
Although it may fly fine done like this. I dont believe it is the way to go.
As The rear elevons go up, you need the front ones to go down. Thats how old control line planes worked. The lift of the wing is being spoiled while your trying to go up.
It may work, but it's illogical to me. (Sorry GB!)
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Old Nov 28, 2012, 04:24 PM
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I'll revisit this later and try to let this sink in.

On the other hand my canopies arrived today !!

Bill
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Old Nov 28, 2012, 06:54 PM
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I'll revisit this later and try to let this sink in.

On the other hand my canopies arrived today !!

Bill
Keep it simple and fly it like a 4 channel plane. Just don't expect it to roll fast.
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