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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Making a FG fin
02-05-2010 12:56 PM  8 years agoPost 1
krashtagain

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ohio

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Have any of you guys had to make a FG fin ? I have a fuse I need to make a horizontal fin for . Should I layout the design on lets say a piece if plywood and cover it in FG ?

If you're not living on the edge you're just taking up space !

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02-05-2010 01:37 PM  8 years agoPost 2
Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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does it have to be made from fiberglass? just about all the scale helis i have, has a vertical fin i made from wood. i laminate balsa with 1/64th sheet of birch. the birch has a very smooth surface which is easy to finish and paint and you cant tell its wood.
out of curiosity, what fuselage is the fin for?

drive a rotary, fly a rotorcraft

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02-05-2010 02:16 PM  8 years agoPost 3
krashtagain

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ohio

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I don't guess it has to be FG , if the wood will hold up to high speed passes .

If you're not living on the edge you're just taking up space !

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02-05-2010 02:21 PM  8 years agoPost 4
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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okay i see now you said horizontal and not verticl like i was thinking. still yeah a fin made form balsa laminate would do fine on that nova fuselage even at high speeds. laminated it is light and very strong! you can use a thin sheet of balsa to start with and then laminate it with the birch. i use medium ca to bond them together (its like a balsa sandwich) and thin ca to seal the edges. afterwards, i sand the edges to a sharp airfoil leading edge(and trailing if you want) and use 300 to 320 grit for the surface. prime it with a few coats, paint and you're done.

drive a rotary, fly a rotorcraft

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02-05-2010 02:33 PM  8 years agoPost 5
krashtagain

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ohio

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Ok i'll make it out of wood then . What would you use to attach it to the fuse ?

If you're not living on the edge you're just taking up space !

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02-05-2010 03:55 PM  8 years agoPost 6
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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well it depends, as i dont suppose you would want it removable you would more likely have it permanently glued. assuming this is being done before finishing and painting, i would use epoxy to glue it in. then mix up another batch of epoxy mixed with microballoons to make a fillet at the joint. a good epoxy to microballoon ratio makes it very sandable to make a smooth fillet and make it lok like the fin is a one piece part of the fuse like the vertical fin is.
hope this helps.

drive a rotary, fly a rotorcraft

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02-05-2010 05:10 PM  8 years agoPost 7
tintmaster

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Wichita, Ks. U.S.A.

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Fin
Emile, Your the man! You know everything.

Just call me Farmer Brown. 'Cause I know how to really plant 'em

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02-05-2010 06:34 PM  8 years agoPost 8
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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well not everything, just what i have done before

drive a rotary, fly a rotorcraft

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02-05-2010 10:58 PM  8 years agoPost 9
Grimracer

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Eau Claire WI

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Mine are hard balasa (450 machine) and then glassed with .75 per sq cloth.

The fin/s just bolt on like the plastic ones might have.

The best deal with wood is you can easly airfoil the parts if needed.

Grim

Michael J Zaborowski

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02-06-2010 02:15 AM  8 years agoPost 10
krashtagain

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ohio

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Thanks Copter , So just use epoxy to glue it on and then mix up microballons with some more epoxy for a nice fillet around the joint . What are microballons and where are the bought at ? Could I use a hypo needle to put the epoxy in the joint or how would you do it so there isn't an over abundance of epoxy to be sanded ?

If you're not living on the edge you're just taking up space !

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02-06-2010 02:47 AM  8 years agoPost 11
twguns

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Indianapolis, IN

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Microballons are normally available at most hobby shops...

Slower curing epoxy will cure stronger and less brittle than the 5 min. stuff...

When mixing the microballons, mix the resin with the mb's and then mix in the hardner...

Have fun

bigTim

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