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  #1  
Old 07-24-2018, 11:14 AM
gopalapagos gopalapagos is offline
 
Join Date: Aug 2017
Location: Bay Area, CA
Posts: 7
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:

http://www.vansaircraft.com/cgi-bin/...al&product=fps

http://www.tcwtech.com/ifc_intellige...ontroller.html

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,
G
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  #2  
Old 07-24-2018, 01:31 PM
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dave4754 dave4754 is offline
 
Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 439
Default Flaps plus

I purchased this one.

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

http://www.aircraftspruce.ca/cache/3...PS-PlusEnc.jpg

Dave
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  #3  
Old 07-24-2018, 03:19 PM
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Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 1,770
Default

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.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
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Old 07-24-2018, 05:16 PM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,558
Default

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.

Bevan
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  #5  
Old 07-24-2018, 06:46 PM
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vlittle vlittle is offline
 
Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,021
Default

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
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  #6  
Old 07-24-2018, 07:08 PM
Jpm757 Jpm757 is offline
 
Join Date: May 2013
Location: Sherman, CT
Posts: 223
Default

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.
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  #7  
Old 08-18-2018, 11:19 AM
Shawn25854 Shawn25854 is offline
 
Join Date: Aug 2014
Location: Clearwater, FL / KZPH
Posts: 136
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I, like Vern, was not happy with what's available so I also built my own programmable flap controller. I wanted a very simple version that with a single push of a button would deploy the flaps to a preprogrammed position. It can be set from one to three programmed positions the same way you program your car radio. Move the flaps to the desired position and use the memory preset. No counting, no holding buttons down and looking over my shoulder. I wanted a simple way to deploy flap so I could focus on flying the plane. It's capable of up to 10 amps of current. I have 4 lighted push buttons labeled UP, 10°, 20° and 30 °. They could be any degree you desire. I simply push whatever position I want and the flaps go there. The LED in the button is on solid for whatever position you are in. When I push a desired setting that button flashes while the flaps are moving and it goes solid when it reaches the programmed position and they stop. It works with any 12v actuator and the Ray Allen position sensor. Or actuators with built in position sensors. To get 40° of flaps will depend on the actuator and how it's mounted. I also have a manual backup in case of complete microprocessor failure.

It's been working great now for countless hours of flying.

Last edited by Shawn25854 : 08-18-2018 at 01:55 PM.
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  #8  
Old 08-18-2018, 09:38 PM
rightrudder rightrudder is offline
 
Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,624
Default

Quote:
Originally Posted by Raymo View Post
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.
My method too. Simple & reliable.
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  #9  
Old 08-19-2018, 09:56 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,511
Default Count for down.

Quote:
Originally Posted by Raymo View Post
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.
Quote:
Originally Posted by rightrudder View Post
My method too. Simple & reliable.
+2 and have a mark inside the left aileron to keep my brain tuned. I hardly use the marks now @40 hrs. This is the way Mike taught. Seems to be working for me.

That said, the automated landing trim setting sounds interesting.
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  #10  
Old 08-19-2018, 10:02 AM
rv7guy2 rv7guy2 is offline
 
Join Date: Apr 2005
Posts: 65
Default Flap Position system for RV-7

Hi there
I have been using the Van's system for 10 years and am quite satisfied. It takes a little finessing to get the travel just right but once it's set it works great. Follow the instructions and make sure there is no binding of the sensing rod. I get the full 40 degrees with 3 clicks on the flap switch.

Dave RV-7
C-GCPD
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