Performance Tables for 74 P337 vs Riley Super SkyRocket

[DrZGard]

I have taken the book figures to make a couple of Excel spreadsheets for performance tables comparing a 1974 T337G to Riley's Super SkyRocket conversion with the TSIO520's. The book figures only show MPH and LBs of fuel burned and total range exhausting fuel (which is a misleading figure). These tables add Knots, gallons per hour and range with 45 minute and 1 hour reserves. The 74 SkyMaster carried 123 gallons/738 lbs while the Super SkyRocket carries 148 usable/888 lbs.

I turned the excel files into pdf files since they didn't want to upload.

[patrolpilot]

Curious, why the choice of 2200 RPM?

[DrZGard]

Originally Posted by patrolpilot

Curious, why the choice of 2200 RPM?

2200 rpm is the max continuous rpm after initial takeoff and climb as well as cruise in the Riley Super SkyRocket. I know... interesting.

[patrolpilot]

Originally Posted by DrZGard

2200 rpm is the max continuous rpm after initial takeoff and climb as well as cruise in the Riley Super SkyRocket. I know... interesting.

Learn something new everyday!

[Dr.Dan]

Interesting, thanks. The P337 values are very similar to what I've experienced with my '73 P337 so far. The Rocket seems to have a significantly increased fuel burn for a modest increase in speed. I guess one other factor is it gets up to altitude quicker.

DD

[DrZGard]

Originally Posted by Dr.Dan

Interesting, thanks. The P337 values are very similar to what I've experienced with my '73 P337 so far. The Rocket seems to have a significantly increased fuel burn for a modest increase in speed. I guess one other factor is it gets up to altitude quicker.

DD

The STC only allows full power, which is 300 hp, not 310 like the same engine in 340. 38"@2,600rpm for 2 minutes. Then 34"@2200rpm for max continuous (which ironically is 225 hp). The other interesting factor I discovered is the AD for the engine back in 2009 instructing to NOT operate at rpm's below 2,300 for cruise. If I can get a chance to talk to a Super SkyRocket pilot I can ask if they use something other than the 2,200 which the Riley POH calls for.