From: kenpowell@alltel.net Sent: Wednesday, January 30, 2002 5:01 PM To: Powell, Ken Subject: (Fwd) Cantilevered RV-4 Engine Mount weights ------- Forwarded message follows ------- Date sent: Sun, 27 Jan 2002 17:42:45 -0800 From: ACRE NL Subject: Cantilevered RV-4 Engine Mount weights BCC to: > > > Well, after months of rebuilding motor mount pieces and lots of > > > input from the guys here on the list, I am finally finished with > > > my RV-4 motor mount. Note that this mount is for a PP motor so > > > I had a little more flexibility on the left side of the engine > > > since there is not a 4 or 6 port intake manifold to make things > > > more difficult. Special thanks to Paul, Mike Wills and Monty > > > Roberts for their input. The advantages of this mount is that > > > for a narrow single place or tandem aircraft there is much more > > > room under the engine for radiators and exhaust; the value of > > > this cannot be underestimated unless you have tried to fit all > > > of this stuff in a 24" wide cowling! Pictures are attached. > > > > > > Ken Powell > > Looks like it will work fine Ken. Glad to see you supported the > > upper truss in the vertical plane. Good way of doing it. The only > > thing I can see to watch is a little local bending in the > > connection between the rubber bushing brackets and the rectangular > > cross tube. Got any detail sketches on that? What does it weigh? > > > > Paul Lamar > The original conical mount from Van's weighed 11 lb 6 oz. The > new mount > weighs 13 lb 3 oz, or 1 lb 12 oz more. Lot's of extra .75" tubing > there! > The engine adapter mounts weighed a total of 5 lb 12 oz. The > lower mount > weighed 2 lb 12 oz, the right upper weighed 1 lb 11 oz and the upper > left mount weighed 1 lb 12 oz. The three adapter mounts were > weighed together as well as individually to eliminate rounding > errors. Note that the upper adapter mounts (on both sides) tie the > front and rear of the engine together to eliminate extra loads on > the tension bolts. > > Ken Powell The AirCraft Rotary Engine NewsLetter. Powered by Linux. ACRE NL web site. http://home.earthlink.net/~rotaryeng/ http://www.linux.org ------- End of forwarded message -------