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06-18-2013, 10:11 PM
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Join Date: Mar 2006
Location: Evansville, Indiana
Posts: 661
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Quote:
Originally Posted by N941WR
Nope, one data point doesn't make it so.
I checked the numbers from Dan C's old list of RV W&B's (I sure wish he had kept that one part of his site mye up.) and the average of the 36 -7's listed (w/o Egg engines) is 79.59" and the average of the 50 (again, w/o Egg engines) -7A's is 79.95", close to a 1/2" further aft.
Remember, with the A's, you have those heavy mains, brakes, wheels and tires behind the CG. With the tail draggers, you only have that little TW back there and it is not enough to offset the balance.
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All of the data was provided by builders. Sounds like this would be a great addition here on VAF. I will be calculating a new CG as a part of my Conditional, that is under way right now, and will post the info soon. DR, do you think your new graduate would keep a w&b spread sheet updated? Since my -7A has an extra 38 lbs. on the nose and 5/8" spacers between the firewall and engine mount I am very interrested in seeing where my plane fits into the fleet.
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Steve Eberhart, W9JUQ
3EV - Evansville, IN
Where is Steve and the Sky Terrier?
RV-7A Slider, O-360 A1A, Catto 3 blade, 2 screen Garmin G3X Classic, GTN 650, Bionics APRS. FLYING since June 24, 2009
EAA Chapter 21
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06-22-2013, 11:38 PM
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Join Date: Dec 2011
Location: North Carolina
Posts: 94
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You guys are worrying me now, me and a buddy(mostly him) is building a 7A and we have a 0-320 and a catto 2 blade,,, are we gonna have bigtime problems with cg with baggage on board, the whole reason we went iwth the 0-320 and fp is to save weight making a light aiframe, he built a 7 several years ago with same setup and didn't have any cg issues, and adding a crush plate just defeats the purpose in my opinion, its sorta deadweight, but I also see why people do, not judging just thinking outloud.
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06-23-2013, 04:07 PM
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Join Date: Feb 2005
Location: Bay Pines, FL (based @ KCLW)
Posts: 1,955
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Quote:
Originally Posted by newtech
And this is a picture of the Sabre 20 lb. crush plate and Landoll harmonic damper

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Any idea how much Van's standard crush plate weighs?
Anybody have one on the shelf that can weigh it & report back.
Steve, yours appears to about an inch thick. Is that correct?
I believe Vans is 1/2".
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Danny "RoadRunner" Landry
Morphed RV7(formally 7A), N20DL, PnP Pilot
1190+ hours
2019 Donation Paid
Last edited by roadrunner20 : 06-23-2013 at 04:08 PM.
Reason: removed other image
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07-02-2013, 09:18 AM
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Join Date: Feb 2006
Location: Valley Forge, Pa
Posts: 636
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0-360 Catto 3B on a 0-320 mount SJ cowl photo
There is a photo of the Chad Jensen's Ex(RV-7 Long Nose) on the front page VAF today sporting a new paint job. I like the look of the 2" extension. I have no illusions that this will cure any aft CG problem but it helps and looks way cool to boot.My build is a 7a,0-360,Catto 3B,full anti-splat mods. Has anybody completed a "long nose 0-360 and willing to share the numbers?
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