Bill & Sharon, I had all new nuts bolts and shocks installed on the engine and
they did not help the vibration. My A&P said that a better system of shock
mounting is needed. He said it would be quite a job to get it approved. I think
the cost to have this done would be very high. I am going to fly it as is for
now and see if the vibration reduces as the engine breaks in.
Al Flora
N94748
(HYR)
----- Original Message -----
From: Bill and Sharon Tinkler
To: Albert Flora
Sent: Sunday, April 19, 2009 12:35 PM
Subject: Re: [ercoupe-tech] First Flight
Could there be more shock absorption required in the engine mount? Could the
current engine mount be the source of your vibration?
Bill T.
On Apr 19, 2009, at 11:51 AM, Albert Flora wrote:
All.
First I want to thank everyone for all the assistance.
A special thanks to Hartmut Beil for his suggestion
that I put a 71/52 prop on my coupe. It worked out
well.
I received the coupe on November 30, 2007. It was
delivered in a pickup truck. Now 17 months and an
additional $12,000 later; I flew it for the first time this
past week. I learned quickly to not coordiante a right
bank with the break pedal. Stepping on air for a left
bank did little to assist the turn.
The C-85 with the 0-200 crank STC put out plenty of power.
It handled the 71/52 prop with ease just as Hartmut said it would.
The flight was at Boyceville, WI (3T3). Elevation 967 MSL.
At run-up the full power ststic RPM was a healthy 2250.
Had excellent acceleration and jumped off the runway at 60 MPH
going to 80 MPH and climbing at 700 FPM for 1000 ft. with close
to the 1320 gross. Made a full power level run at 1960 MSL with a
temp of 40F and the engine maxed out at 2500 RPM. This is a
fresh engine and prop not yet broken in.
The only negative impression I have so far is the moderate
vibration from 2000 RPM on up to 2500 RPM.
My AP/AI changed the prop position to 3 locations and found
the best location which helped a little. He also did a dynamic
balancing that helped a little more but not much. He said the
vibration may show a slight improvement when the engine is
broken-in. I hope so. It reminded me of the old C-119's.
I did not like the vibration then and do not now.
Thank you all again!!
Albert Flora
N94748
(HYR)
