Jerry Bass wrote:

Now I get a strong 1200 fpm climb at 6600.  Full throttle at level

is 155kts

[178 MPH] or better at 7500.  Noisy though.

Something wrong. You should be doing over 200 MPH like Ian as you both
have 2.85:1 gear boxes and RV6A's. With more climb as well. In theory

the

single pipes should be around 30 inches give or take a few. Perhaps

your prop

has something to do with it.

Paul Lamar

Are you sure he wasn't refering to 155 kts in the climb?
Something would be wrong if that was the level speed.

Dennis.

Dennis Hawkins (n4mwd@amsat.org)

He said "at level". Sounds to me his prop might be under pitched.
Ian are you there? What is your prop diameter and pitch again?

Paul Lamar

 Hi Fliers
My Prop. is 72.5 inches Diameter and 81 inch Pitch. Max engine RPM at 2000
feet. Around 7300 rpm. Haven't done a high speed low level run recently as
it is far too bumpy, and very hot. The more important figure is at
10,000feet. WOT lean 155knots indicated. 6500rpm. I would like to know if I
could get the same speed at 10,000ft with a corser prop and lower rpm and
lower fuel burn. Every direction I go in West  Ausralia seems to need a
range of 500kn miles( +reserve), which I can do if the wind is right.
I have been doing the run to Rottnest Island a few times recently to go
diving. It is 35 mins engine time, 100knots [115 MPH] at 2000ft 
(no tansponder) at 18 > litres per hour. [4.7 GPH  56 HP at BSFC = .5]
Ian

 
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