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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
 
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Location: Richmond Hill, GA (KLHW)
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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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  #4  
Old 07-24-2018, 05:16 PM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,559
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: 225
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, 09:38 PM
rightrudder rightrudder is offline
 
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Location: Laguna Hills, CA
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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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  #8  
Old 08-19-2018, 09:56 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,521
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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  #9  
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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  #10  
Old 08-19-2018, 11:51 AM
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jjconstant jjconstant is offline
 
Join Date: Dec 2006
Location: Oakland CA
Posts: 767
Default

I can't remember which one I have but I purchased a positioning system 10 years ago and use it. The fact is that there is a bit of flexibility because when you install it there is a notched rod that actuates the microswitches and you can position it on the flap actuator pushrod to give you some adjustability.

I had to spend a great deal of time finessing it to give me the results I wanted. One thing not already mentioned is to think carefully about how much "full flaps" you want. Yes the factory setting is 40 degrees. This is also extremely close to the flap coming out from under the upper wing skin. I don't think I could tell much of a difference in landing behavior between 40 degrees vs 37 or 38 degrees, but it allows more overlap to help assure that inadvertent popping out of the flap doesn't occur. If you don't notice it and retract the flaps it will be a very bad day.
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