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  #11  
Old 10-28-2017, 12:38 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 3,246
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A few things that might be interesting -

The early RV-3 engine mounts only had the four perimeter attachment points to the fuselage.

The current RV-3 engine mounts have two additional ones in the bottom middle. These are co-planar with the others, since the RV-3 firewall is flat.

The current RV-4 engine mount has six mounts somewhat like the RV-3 mount, but the middle bottom two are inclined forward of the vertical and are not in the plane of the others, because the RV-4 has a different firewall that includes an angled bump-forward to allow more foot room. I don't know if older RV-4 engine mounts also had these two additional points.

Dave
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  #12  
Old 10-28-2017, 01:30 PM
13brv3 13brv3 is offline
 
Join Date: Nov 2005
Location: Tellico Plains, TN
Posts: 449
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Hi Dave,

Yes, that's interesting indeed. That's pretty much the final proof that the previous owner was mistaken about the RV-4 engine mount. At this point, I'm sure he just didn't recall the details, and was actually referring to the lower firewall weldments. I looked at those yesterday, and they're clearly newer than everything else, with a different paint finish, so the mystery is solved.

Appreciate the replies!
Rusty
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RV-8, SN-80587, built, flown, sold.
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  #13  
Old 10-28-2017, 05:12 PM
jliltd jliltd is offline
 
Join Date: Sep 2013
Location: Farm Shack, TX
Posts: 232
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I just measured my RV-3B and it is 27 & 7/8" inches from the ground to the bottom of the firewall parked in the hangar.

Jim
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  #14  
Old 10-28-2017, 05:27 PM
BruceT BruceT is offline
 
Join Date: Apr 2015
Location: Romsey
Posts: 4
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Rusty,
just measured mine built in 2013 it is 28"m at the firewall and 51 3/4' at the spinner
Bruce
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  #15  
Old 10-28-2017, 10:29 PM
13brv3 13brv3 is offline
 
Join Date: Nov 2005
Location: Tellico Plains, TN
Posts: 449
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Thanks guys. I think we have overwhelming evidence that around 28" is the normal measurement. Now I'll just try to quit wondering why my old one was shorter :-)

Seriously, it was a completely custom motor mount, so I'm sure that's probably the reason.

Rusty
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RV-8, SN-80587, built, flown, sold.
RV-3B, SN-10751, rotary engine, built, flown, sold
RV-8, SN-82470, built, flown, sold.
RV-3B, SN-11351, purchased (yes it's cheating)
2017 dues paid
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