I have a rv-7 with a 0-320 H2AD motor the motor has 1525 hours burns one quatr every 20 hours and the lowest cylinder is 72 lbs not bad for 3500 bucks I have put one 130 hours on this engine
I have a sessenich metal prop 80 pitch
It flew very well fairly fast once trimmed out in the 190's often but when at gross weight it lagged in climb so i wanted to make possible improvements
1 install sam james plemum yes lots of work on the h2ad motor modified vans cowl and turned out great
gained about 50 RPMs and some speed gain a few knots
for climb i orded a catto prop it is a 68long 74 pitch
I test flew with the sensenich prop then swaped the prop and flew the same with the catto
also used the heavy crush plate weight on the tail wheel stayed the same
static rpm went up to 2250/2300 rpm up from 2150
time airborn from idle to wheels off the ground using panel mounted timer gained 4 seconds
climb out at 80 mph gained 150 fpm
cruise at 5800 feet with auto pilot on no gain nor loss
I also found that during taxi it was no smoother
I did like the larger RPM range for when i was just up there dancing i didn't have to worry about overspeeding as much as the sessenich
however at certain rpm's on deaccelerate i would pick up vibration that i had never had before i could feel it in the stick it was worse on short final but only at centain rpm's
The wind had changed from the first flight and on the catto flight it was all over the place not strong but enough
I have threee more hours to put on the prop befor i can bring up people to check it a gross but so far i donn't know if the prop was worth it for me
ken flying in maine
I have a sessenich metal prop 80 pitch
It flew very well fairly fast once trimmed out in the 190's often but when at gross weight it lagged in climb so i wanted to make possible improvements
1 install sam james plemum yes lots of work on the h2ad motor modified vans cowl and turned out great
gained about 50 RPMs and some speed gain a few knots
for climb i orded a catto prop it is a 68long 74 pitch
I test flew with the sensenich prop then swaped the prop and flew the same with the catto
also used the heavy crush plate weight on the tail wheel stayed the same
static rpm went up to 2250/2300 rpm up from 2150
time airborn from idle to wheels off the ground using panel mounted timer gained 4 seconds
climb out at 80 mph gained 150 fpm
cruise at 5800 feet with auto pilot on no gain nor loss
I also found that during taxi it was no smoother
I did like the larger RPM range for when i was just up there dancing i didn't have to worry about overspeeding as much as the sessenich
however at certain rpm's on deaccelerate i would pick up vibration that i had never had before i could feel it in the stick it was worse on short final but only at centain rpm's
The wind had changed from the first flight and on the catto flight it was all over the place not strong but enough
I have threee more hours to put on the prop befor i can bring up people to check it a gross but so far i donn't know if the prop was worth it for me
ken flying in maine
