|
Here an update.
Sam Hodges informed that Catto was going to make him a new
prop - same diameter 76" but reduce the prop area by 30%. My back of the
envelope calculations indicates that should give Sam what he needs for his
Renesis
His first Catto prop was 8" in chord at its widest.
So 8" x 76" = 608 Sq inch (assuming same chord entire diam - which of course it
is not, but again back of envelop), this was simply way too much prop even for a
220HP engine
A 30% reduction in prop area = 608 - (608 *.30) = 608 -
182 = 425 sq inch / 76 = 5.6" chord width. That is just a tad wider
(1/10th inch) than my 74x88 Performance Prop, so give Sam's Renesis will likely
produce 10-15HP more with 2" longer diameter, this one should work out
fine.
Ed
|