Flaps to fuselage gap

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Harveyseven
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Location: Shrewsbury UK

Flaps to fuselage gap

Postby Harveyseven » Fri Nov 15, 2019 6:33 am

Hi,

I'm trimming my flaps on my RV7 to get the gap ‘right’ between them and the fuselage. So far I’ve got about 1/16” and wondered what gap size other builders had gone for. Too big and it will look massive and too small and it will look great in the workshop but after painting and when flying and vibrations, it might scuff the side of my shiny new aircraft.
Maybe 1/8” is ideal, however, as I can trim material off but can’t add it, I thought I’d throw it out there for any comments.
No Vans type measurements like 3/32” or 7/64” please (those who’ve built the slow build kit will understand) :)

thanks
Member of a group with an RV9A. Building my own Slow build RV7 tip-up.
Fuselage complete with tail & wigs fitted. Just started the wiring.

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bruceh
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Re: Flaps to fuselage gap

Postby bruceh » Mon Nov 18, 2019 8:18 pm

I can't speak for the -7, but there are references on the plans (page 9 top view) of the RV-9 for leaving a nominal 1/4" gap between aileron and wing tip, and a nominal 3/16" gap between aileron and flap. The wing root fairings need a 1/8" gap between the side skin of the fuselage and the wing skin.
Ideally, I don't think you need to trim the flap to fuselage gap, but I know on the RV-10 it requires quite a bit of trimming. I would go with 1/8" minimum.
Bruce Hill
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Harveyseven
Class G
Posts: 4
Joined: Mon Apr 07, 2008 7:21 am
Location: Shrewsbury UK

Re: Flaps to fuselage gap

Postby Harveyseven » Fri Nov 22, 2019 12:11 am

Ok, thanks Bruce.
You’re correct in what you say, for the aileron to flap and wing tip, wing root to fuselage measurements are laid down but not a specific measurement for the flap to fuselage. I’ll go with 1/8”.
Member of a group with an RV9A. Building my own Slow build RV7 tip-up.
Fuselage complete with tail & wigs fitted. Just started the wiring.

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bullojm1
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Re: Flaps to fuselage gap

Postby bullojm1 » Wed Dec 04, 2019 10:08 pm

Which is about the same thickness as a thick sharpie!
Mike Bullock
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RV-7 | Superior IO-360 | Whirlwind 200RV
Garmin GTN650 | GRT Dual Sport SX EFIS
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