ground loop
Registered User
Anchorage
Steve,
Are the amphibs about the same speed as straight floats?
Are the amphibs about the same speed as straight floats?
steve said:Crash,
The picture would do no good since my ASI is totally whacked. I flight plan 100kts (115mph) with 31" tires, belly pod, extended wings, etc. I have done some GPS tests in many directions and calm winds and that is about all she has. That is running 2400rpm at 24" of MP at low levels. If I push it to 25" mp I can eeek out another few knots - but at the cost of a lot more fuel than the knots are worth.
sj
mvivion said:Crash,
What kind of fuel burn do you run at that power setting, and have you strobed your prop to verify the accuracy of your tach?
Just curious.
As Brian says--those are pretty exceptional Cub numbers in my experience. I don't have a lot of experience in 180 Cubs, though.
MTV
Crash, Do you have the Thrustline mod on your Super Cub?I cruise at 107 with pod and big tundra tires.
Lance said:Steve,
Have you gone up to the 4-7000 ft range to see what that constant speed will true out at? Any better than 100kts?
I would imagine you would open up the spread between your and Crashes speed even more as you go up.
Lance
mvivion said:Crash,
I'm well aware that there's a lot of variability in Cub speeds, and especially in Cub fuel burns. The differences in fuel burn rates is one of the little mysteries I've never quite been able to figure out.
But--you didn't answer either of my questions:
Has your tach been verified for accuracy?
What fuel burn are you seeing, leaned or not, at that power setting?
Saying you are burning less than an O-320 in another Cub means nothing to me, cause I've seen those that burn anywhere from 7.8 up to nearly 10 gph at that power setting, which is my point.
If I were to run a Husky at that rpm setting, I'd be burning a lot of gas, like 9 +, even if I pull the throttle back.
Again, I'm just curious, and not doubting, just trying to calibrate.
These things tend to be all over the place.
MTV