Angier,
For self interest purposes I upped the hi speed limit on the governor to
2770 and I routinely saw 2740 to 2770 on takeoff and climb to 700
AGL. 3000 RPM seems to have been a reasonable limit for certified
props. I xcntry raced at 2660 often with no
debilitating results.
Calculate tip speed and anything over .8 Mach is troublesome.
Hmmmm 70 inches equal a radius of 35 inches - say 3 feet. 2800
rpm equal 3 x pi x 2800 = 26390 ft/min = 5 mpm = 300 mph = .394 Mach tip
speed. No Problem.
Prop balance is another story.
The "wing" chord and twist in a prop usually provides max lift abut 2/3 of
the way towards the tip. Additional speed on the designed prop has lift vs
drag limits. Oh, that's right - if you have a Hartzell prop on a 360 it is
only 68 inches as a result of vibration analysis...............
Scott
In a message dated 4/26/2013 6:05:33 P.M. Central Daylight Time,
N4ZQ@VERIZON.NET writes:
Scott, I
think I may have acknowledged the warning and triggered a reset.
For an
IO360 180hp, what high RPM would be a serious cause for concern?
I
routinely see 2660/70 for sea level takeoff so not sure I need to tweak the
gov.
Angier
N4ZQ
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