Dennis,

 

What is the max static RPM you can get?  There are two of us with the same Renesis, RD1-C and Catto 76X88 and the best we get is 4750.  Does that match what you get?

 

Chris

 

 

Friday I flew to Llano (70 miles) to pick up some barbecue for the wife and myself.  Take off was at 900' field elevation and I climbed at full throttle to 7,500'.  I used 7500' as the test altitude because Bill Eslick's RV-6 flight test data sent to the list on 3/10/10 had graphs for 7500'.

My aircraft is an RV-7A, Renesis 4 port, RD1-C redrive 2.85:1, Catto 76X88 composit prop, EC-2, EM-2, very quiet exhaust, DEI intake designed for 6200 rpm, full 42 gal. auto fuel, 200 # payload (pilot with some A/C tools, headsets etc).

Field elevation  900'
Climbed @  110 kts. indicated air speed  - Full throttle climb to 7500"
OAT 70 deg. at takeoff
Initial climb rate was 1800 - 1900 fpm
( I get ~ 2400 fpm with only 21 gallons in the tanks)

@ 4500" the climb rate was ~ 1400 fpm
Water 188 F, Oil 200 F

@ 6000' the climb rate was ~ 1250 fpm
Water 188 F, Oil 203 F , OAT 60 F

@ 7500' climb rate was ~ 1000 fpm
Water 189 F, Oil 204 F

I leveled off for about 5 minutes than went to full throttle again.

Full throttle for about 3 ot 4 minutes @ 7500'
MP 23.3 in.
Fuel flow - 12.1 gph
TAS 193 mph  - EM-2 data
Engine: 6660 - 6680 rpm
Water 184 F, Oil 205 F  OAT 65 F

When I fly at 7500' I normally use 8 to  8.3 gph
TAS 157 mph
Water 160 F, Oil 180 F

The barbecue from Cooper's in Llano was great!

Dennis Haverlah