After a lot of back and forth over the last week I decided to use
four Barry mounts for my Renesis installation in the RV-4. Two at
bottom rear of engine, two at top front near re-drive attachment
(actually the top mounts near firewall).
I estimate total engine installation with re-drive, prop,
radiators, oil cooler, exhaust, intake and alternator to come to
about 330 pounds or less.
http://www.barrycontrols.com/UserFiles/File/Product_Catalog/bonded_tube/bcdi_prod_bonded_22000_series.pdf
Choice is between Barry 22001-15 (or -14) and 22002-13
(to -15) or their equivalent.
-13 appears to be a dyrometer (stiffness) of about 55, -14 about
65 and -15 about 75.
Brian Trubee used the 22002-13 equivalent.
I guess the 22001-14 or -15 can handle the load (rated at 250 to
300 pounds, showing compression curves to 1,200 and 1,800 pounds,
compressing 0.15").
The 22002-13 to -15 rated at 240 to 630 pounds, showing
compression curves to 1,000 through 2,600 pounds, compressing
0.25"
Obviously the softer ones will allow a lot more motion, perhaps
too much at the spinner/cowling intersection?
Other than the 22002-15, they are available for less than $30 for
four, including shipping (not including bolts, washers and mount
plates).
Any opinions or suggestions as to which to use?
I also need to figure out the optimum angle of the mount plates
(OSB wood in pictures). Looks like CG will be mid front (closest
to prop) rotor housing.
Finn
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