Quote:
Originally Posted by ATAG_Dutch
Hello IceTbag, oh fellow Northwesterner! 
Oil temp is normal at 90-95 degrees, max coolant 120, but it's best to keep at around 90 for oil, 100 for coolant. Lowering the boost (throttle setting) will lower your coolant temperature, lowering your RPM to 2650 will keep your oil temp nicely under control. If you set boost to +5 (the white mark in the red zone on the boost gauge) and RPM at 2650, with 50% radiator you should have no probs at all. This is in the Hurri Rotol, Spit Ia and IIa.
In the Spit I and Hurri DH, with 2-speed props, I tend to keep it in fine pitch with fully open rad up to about 6000ft, or when rpm reaches 3000, then throttle back to zero boost and coarsen pitch. Boost will rise to about +3, I then throttle back up to +5 boost and reduce radiator to half. In fact I normally don't go over +5 boost unless in combat.
No doubt others do it differently, but this works for me.
This is all using cockpit instruments. I've no idea what the digital stuff would say.
For the max performance stuff, it largely depends on altitude, as the relationship between pitch and boost alters the higher you go. |
Sound advice.
Some notes about the two stage Spit I and Hurri DH:
If you are in combat and you at turning and losing speed, or diving down and then trying to cilmb back up, keep an eye on your RPM. Never enter a high degree dive on fine pitch and avoid attempting to make a high degree climb in coarse. The first situation will overspeed your engine as the wind forces your prop to turn faster and faster past the 3,000rpm mark, and the second situation will effectively act as an engine brake and you'll either stall out or lose so much speed that you'll be a sitting duck.
Never put your prop pitch from coarse to fine without reducing your throttle to avoid putting strain on the engine as your RPM jumps about 500 to 750 RPM in one shot. IE: if you're in coarse pitch, and you're reading 2,600 rpm and you put it into fine pitch without reducing your throttle, you will blow your engine in about three seconds flat.