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  #21  
Old 04-13-2010, 07:03 PM
L'Avion's Avatar
L'Avion L'Avion is offline
 
Join Date: Apr 2007
Location: Memphis
Posts: 159
Default Trim

I have an RV-4 with manual trim, and an RV-3 with electric trim. Manual trim for me by a wide margin.

Barney, in Memphis
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  #22  
Old 04-14-2010, 09:34 AM
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longranger longranger is offline
 
Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Quote:
Originally Posted by szicree View Post
On the floor with a c-frame and a B.F.H. (big friggin' hammer). I suspect pneumatic squeezer is easier, but hammers are cheap.
That's the way I did mine. It took about 3 hours/spar, and I came away sweating like a blacksmith, but rarely has there been end-of-job satisfaction like that one was. If I were doing it again, I'd do it the same way.
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  #23  
Old 04-14-2010, 12:46 PM
Brian Vickers Brian Vickers is offline
 
Join Date: Mar 2005
Location: Bainbridge Island, WA
Posts: 333
Default No wrong way to do it

Van's has a pneumatic rivet squeezer they rent for fabricating your own wing spars (needed for the big rivets). That is what I did. Anodized spars are nice too so I'm not advocating either. Assembling the spars is one of the few positive sweat equity options to save money, and that was the driver for my decision.

Manual vs. electric trim; no wrong choices on this one either. My ship is a simple, light weight, wood prop sport plane. My goal has always been fun and easy to maintain, with simple systems. Yes, I have a single ?do it all? glass panel unit. Originally I installed a quadrant with manual trim lever sandwiched behind. It worked very well, but there was play in the combined throttle and mixture linkages. The thick green cables are stiff and difficult to route, and the amount of throw in the throttle lever wouldn?t hit both stops on the carb (second hole on the arm). I saw photos of Tony Spicer's 3 and decided to go that route instead. This facilitated using the manual trim lever as originally designed. I agree with the RV herd that a quadrant is nostalgic and sexy compared to knobs, but they are way easier to install, virtually no play in the linkage, lower parts count, less expensive. Also, the cables are thinner and much more flexible, and certified to boot. A collateral benefit is increased room for my long legs on the side where the quadrant formerly resided. I think electric trim is a great option too, and the big green cable is heavy. You can hold off on both of these decisions for a long time, so keep your ?research? paddle in the water and enjoy the build. You will spend many wonderful hours hashing out these, and many more decisions, in your mind. That is the essence of the fun; planning and customizing YOUR airplane.



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  #24  
Old 04-14-2010, 05:56 PM
wrongway john wrongway john is offline
 
Join Date: Jul 2007
Location: TX & CO
Posts: 466
Default

Quote:
Originally Posted by Brian Vickers View Post
Van's has a pneumatic rivet squeezer they rent for fabricating your own wing spars (needed for the big rivets).
As does Bob Avery of Avery tool. Seen Bob a few weeks ago, and he says it's nearly always avaiilable. Bob also rents out electronic scales for the weighing of your plane.
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  #25  
Old 04-15-2010, 02:09 PM
Jetj01 Jetj01 is offline
 
Join Date: Mar 2005
Posts: 337
Default If electric trim, get the rate reducer

I have owned both manual and electric trim RV-4s. My current RV-4 has the electric elevator trim. The big difference this time is I also installed a rate reducer module on the MAC trim system which greatly slows down the trim rate to the elevator. In the past on both my -4s and my -6 and -8 I had the standard setup and a little bump of trim could be excessive. Now, I have no problems at all and really like my electric trim setup on my stick 'cooly hat.'

As for flaps, if you want to have someone in the back seat, get electric flaps. They are quite easy to install and/or retrofit and have been without problem. Love em!

Lastly, the 'factory' spar is excellent and does help the resale of any VANs aircraft. Remember, there has NEVER been a spar failure of an RV-4, so I would not worry about that in this particualr aircraft...the best of the VAN's fleet! (Flame bait!)

Tailwinds
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Eagles Nest, TX
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