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02-25-2012, 11:31 AM
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Join Date: Jan 2012
Location: Weiz / Austria
Posts: 30
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manuals flaps for RV-8 / 8A
hi everyone,
just wanted to know whether there is anyone out there who built his RV-8 / 8A with manual flaps ? Just started on my RV-8A kit and would prefer to install manual flaps. Electrically driven flaps might be nice to have but are just another potential source for a defect. Would be grateful to get your ideas on that topic.
cheers,
Josef
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02-26-2012, 04:44 AM
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Join Date: Mar 2006
Location: Gilbert, AZ
Posts: 1,628
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Why not hand prop it, too?
When I built my RV-8 I tried to get rid of as many failure prone systems as I could. I omitted magnetos, carburetor, mechanical gyros, gascolator and vacuum pump. I replaced them with electronic ignitons, fuel injection, AHRS and EFIS. I essentially ditched 20th century systems and moved into the 21st century.
If you ditch the well-proven electric flaps, I fear that you are taking a step back in time, not to mention the hit you will take when it comes time to sell.
Just my $0.02.
__________________
Ron Schreck
IAC National Judge
RV-8, "Miss Izzy", 2250 Hours - Sold
VAF 2021 Donor
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02-26-2012, 12:42 PM
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Join Date: Oct 2011
Location: CNV9
Posts: 300
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I fully agree with ronschreck.
I flew around 2500 hours teaching in Cessnas without a single electric flap issue (count thousands of touch and go's...  ).
If and when the electric flap motor dies, landing without flaps with this type of aircraft should not be a too big issue... Just a bit more approach speed and landing distance after touchdown...
Anyway, flapless landings should be practiced once in a while...
My 2 cents
__________________
Eric,
2020 dues paid
RV-8 83274
Emp & SB Wings on fuse, SB Fuselage in progress
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro & EFII Bus Manager & System 32 in progress
Aerosport IO-375 + MTV-9-B/183
Skyview HDX (next)
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02-26-2012, 01:54 PM
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Join Date: Nov 2005
Posts: 121
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Cool!
I would love manual flaps! That is a great idea! You can take them on or off as slow/fast as you need to. If you do end up doing that please post some pics, would love to see it!
-David
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02-26-2012, 01:58 PM
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Join Date: Jul 2009
Location: Lee's Summit, MO
Posts: 747
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Manual Flaps
I have been thinking about manual flaps as well. I have not put a lot of thought into it yet as I am just starting my fuse. It doesn't seem like it would be too difficult.
As for you other guys, I'll bet you have one of those new fangled lawn mowers with a gasoline engine huh. What is the world coming to? 
__________________
Robert Williams
Lee's Summit, MO
RV-8 - Empennage & Wings Done
Working on Fuse
O-360-A1A
1946 Cessna 120
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02-26-2012, 02:29 PM
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Join Date: Oct 2011
Location: CNV9
Posts: 300
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Quote:
Originally Posted by DaAV8R
As for you other guys, I'll bet you have one of those new fangled lawn mowers with a gasoline engine huh. What is the world coming to? 
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LOL
No, in fact I have one of the Gardena push models... Works very well in fact !!!
__________________
Eric,
2020 dues paid
RV-8 83274
Emp & SB Wings on fuse, SB Fuselage in progress
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro & EFII Bus Manager & System 32 in progress
Aerosport IO-375 + MTV-9-B/183
Skyview HDX (next)
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02-27-2012, 09:00 PM
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Join Date: Mar 2008
Location: Seattle
Posts: 1,412
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Older Cessna models with manual flaps are highly regarded. 
Vans RV-4 came that way too.
If you converted an RV-8, you still need to operate the flaps with a pair of pusrods, so I don't think you would re-design the flap bellcrank.
The motor actuator pushes down on the bellcrank assembly.
Any flap handle you would desire would most likely be pulled up to deploy flaps.
An arm pointing off the back of the flap handle pivot might be linked to the bellcrank actuator arm, but the space required for the connecting link could create a real headache.
Maybe you should look at an RV-4 and see if there are any similarities.
I stayed with the electric flaps. I already made some mods to my RV-8. They take a long time to complete and are of dubious value.
I'd reccomend you "play thru" and make your mods after you start flying.
Somehow they just won't seem so important.
When you become a repeat offender, and can build faster, consider mods.
__________________
Scott Emery
http://gallery.eaa326.org/v/members/semery/
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
2019
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02-27-2012, 11:05 PM
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Join Date: Jan 2012
Location: Weiz / Austria
Posts: 30
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hi Scotts,
thanks for the advise. Makes sense to me...
Does anyone have experience with installing a second server for the flaps just to have a backup system in case one server fails ?
Josef
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02-28-2012, 12:26 AM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,574
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cessna failed twice!
A c-172 and a c-182 both let me down.
If I had my druthers, I would have installed manual flaps. Couldn't figure out an easy, clean way to do it.
Still awaiting the not-so-dreaded brush-cleaning cycle.
I like the flaps in the C-180 skywagon too!
Quote:
Originally Posted by riseric
I fully agree with ronschreck.
I flew around 2500 hours teaching in Cessnas without a single electric flap issue (count thousands of touch and go's...  ).
If and when the electric flap motor dies, landing without flaps with this type of aircraft should not be a too big issue... Just a bit more approach speed and landing distance after touchdown...
Anyway, flapless landings should be practiced once in a while...
My 2 cents
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__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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02-28-2012, 07:12 AM
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Join Date: Oct 2011
Location: CNV9
Posts: 300
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Quote:
Originally Posted by scsmith
A c-172 and a c-182 both let me down.
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Steve, you must be the exception that confirms the rule...!!!
Manual flaps do have their advantages, less weight, less chance of failure, less maintenance, variable speed of deployement/retraction...etc.
On the 8 though, it does seem to be one big headache to modify.
Is there someone that has done it already???
__________________
Eric,
2020 dues paid
RV-8 83274
Emp & SB Wings on fuse, SB Fuselage in progress
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro & EFII Bus Manager & System 32 in progress
Aerosport IO-375 + MTV-9-B/183
Skyview HDX (next)
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