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Old 07-24-2018, 10:14 AM
gopalapagos gopalapagos is offline
Join Date: Aug 2017
Location: Bay Area, CA
Posts: 4
Default Flaps Positioning System for RV-7 -- full extension?

Hi RV-7 gurus,

I am trying to upgrade my RV-7 to have a flaps controller so that I can have three-position auto-extend and no longer have to look as long out the canopy while holding the switch. I've narrowed the choices down to the one from Vans and the one from TCW:

My inclination is to go with the one from Vans as it's slightly less expensive and factory endorsed, but my A&P was saying something about the Vans FPS not being able to fully extend on an RV-7. I'd like to get full 40 degrees flaps. The Vans web page also says "(degrees of travel varies with aircraft type)" which has me a little worried.

Can anyone else with experience with the Vans FPS on an RV-7 confirm or deny whether full extension is possible with this controller. Vans support staff is unavailable due to Oshkosh and I'm hoping to order this today.

Thanks in advance,
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Old 07-24-2018, 12:31 PM
dave4754's Avatar
dave4754 dave4754 is offline
Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 435
Default Flaps plus

I purchased this one.

It is not flying but it is installed and seems to work good.

Dave Cobb
=VAF=2018 Donation - and a bit extra for great work!
Empennage RV 7 - Tipper
Wings complete

Fuse nearing completion, Canopy complete
AME reviewed and repaired O-320-Lyc installed
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Old 07-24-2018, 02:19 PM
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Raymo Raymo is offline
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 1,689

I considered installation of a sensor and purchased one from Ray Allen, along with running wires but after running the flaps up and down a few times, decided a 2 count for 10, 4 count for 20 and 8 count for full flaps works just fine.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ Catto 3 blade NLE, AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter,
PlanePower Alt, FlightLines Interior, James cowl & plenum
All lines by TSFlightLines

"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army
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Old 07-24-2018, 04:16 PM
Bevan Bevan is offline
Join Date: Sep 2007
Location: BC
Posts: 1,544

I use the Vans FPS version on the RV7A and get slightly more than 40 degrees (full travel of the flaps). It may depend on how it's adjusted.

RV7A Flying
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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Old 07-24-2018, 05:46 PM
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vlittle vlittle is offline
Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,001

I've done a deep dive on flap positioning systems and not been totally satisfied with any of the products.

So what's an old engineer going to do? Yup, I designed my own. It works in parallel with a manual system, so is more fail-safe.

I programmed my Falcon-AVR controller for this (search the forums more more details). Since I adjust both trim and flaps together, I found that only two preset positions make sense: take-off preset and landing preset. In between, I use manual control.

Take-off preset allows one-button push in a go around, and landing preset does the same, but for landing.

Here's the issue: these presets only work well at one CG position (solo flight). With a pax in the back seat, manual trim adjustments must be made. I could probably use a switch to select a mode for this, but that's not user friendly. A side by side would work better.

One more thing. I have found that full nose up trim in the landing configuration gives me exactly the short final approach speed I need for landing. This can be achieved with careful rigging of the trim tab, or in my case, dumb luck.

V e r n. ====
RV-9A complete
Harmon Rocket complete
S-21 under construction
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Old 07-24-2018, 06:08 PM
Jpm757 Jpm757 is offline
Join Date: May 2013
Location: Sherman, CT
Posts: 193

I decided to go with manual flaps on my -7, they work great, simple, light and fast. I used a -6 weldment and modified cabin floor to accept the anchor arm.
RV6 completed 1991 sold.
RV7 #72018 N767T first flight 11/21/2017 100+hrs.
IO-360M1B MT 3 blade, Dual AFS 5600.
2018 dues paid.
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