Fixing warped, covered, sheet balsa... - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-18-2016, 06:53 AM   #1
uberjay
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Fixing warped, covered, sheet balsa...


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Hey guys/gals,

If you have a piece of sheet balsa that's covered with monocote that has warped over time and is now more like the letter "C" which side of the C do you heat to unwarp it?

Do you heat the 'inside' part or the outside part?

This is a vertical fin (not the rudder) on the tail feathers of a Drake seaplane.

Thanks for any tips,
J
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Old 09-18-2016, 07:22 AM   #2
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Re: Fixing warped, covered, sheet balsa...

Hi Jason, since you shrink the monokote when heating it, it would pull harder to heat inside. Try outside and be carefull not to burn the material by staying still.

Good luck

JP
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Old 09-18-2016, 07:46 AM   #3
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Re: Fixing warped, covered, sheet balsa...

Neither side will work. Best to just replace it.
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Old 09-18-2016, 07:15 PM   #4
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Re: Fixing warped, covered, sheet balsa...

Thanks guys.

@Mike it might be true; however, it's worth a shot if I'm going to have to replace it anyway.

J
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Old 09-18-2016, 09:36 PM   #5
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Re: Fixing warped, covered, sheet balsa...

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Originally Posted by uberjay View Post
Hey guys/gals,

If you have a piece of sheet balsa that's covered with monocote that has warped over time and is now more like the letter "C" which side of the C do you heat to unwarp it?

Do you heat the 'inside' part or the outside part?

This is a vertical fin (not the rudder) on the tail feathers of a Drake seaplane.

Thanks for any tips,
J
If the fin is solid wood and not a stick construction, the bow is very likely in the wood and heating one side of the monokote will not exert enough pressure to undue the bow in solid wood.


Strip off the monocote and wet the concave side of balsa sheet and you typically need to "force" or restrain the wood sheet in a bit of an "overbent" position (into a reverse "C" or bow) while the wood dries........ probably not practical/or able to experiment with the degree of overbending required while the wood is part of a vertical fin with bottom edge anchored to the fuselage.... but it might be worth a shot before building a new fin.
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Old 09-19-2016, 06:12 AM   #6
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Re: Fixing warped, covered, sheet balsa...

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Originally Posted by michaely View Post
If the fin is solid wood and not a stick construction, the bow is very likely in the wood and heating one side of the monokote will not exert enough pressure to undue the bow in solid wood.
Thanks. Yes, it's solid wood; however, only ~ 1/32" or so. Very, very thin. I'll give the heat a quick try then dig in to these other tips.

Cheers,
J
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Old 09-19-2016, 07:45 AM   #7
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Re: Fixing warped, covered, sheet balsa...

J,

1/32" balsa sheet......LOL....... that would have been very useful information to include at the start.......
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Old 09-19-2016, 08:44 AM   #8
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Re: Fixing warped, covered, sheet balsa...

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J,

1/32" balsa sheet......LOL....... that would have been very useful information to include at the start.......
... I did say "sheet balsa" ... but yeah, I was typing the original post without the plane nearby to measure / comment on its thickness.

Cheers,
J
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