>
> <snip>
>>
>> Good going Bill. That is just plain great. Here is a tip.
>> The stock RX8 manifold makes 247 HP at 8500 RPM. You will need a bit
>> shorter
>> runners to get peak HP at 7500 RPM
> <snip>
>>
>> Paul Lamar


> Shouldn't that be a little longer?
>
> Bob W.



> Could be. Won't know for sure until sombody dynos it.
>
> BTW Bill, You might need four yellow and two red RX8 injectors
> for anything over 200 HP.
> Tracy tell me the low power secondary RX8 injectors are blue.
>
> Paul Lamar


Bob
Shorter is correct.
What is wrong with selecting a prop. To let her spin to 8000 and get the

HP.

Will Tracy's EMC run two red and four yellow?

Ian

What say you Vance about a shorter prop running at 2,800 RPM?

I am all for this. We have not worn out a rotary yet in aircraft
service. I would like to see people run it at higher RPM to
see exactly what the TBO limit would work out to.

Paul Lamar

2800 is still a rather modest rpm, and a slightly shorter prop will
have almost no perf compromise at top and cruise speed, A slight
loss in static and climb where disc area becomes more significant
just do not decieve yourself that you can make up diameter loss
by more blades  - unless the equivalent 2 blade is a real paddle,
the only gain with 3 blade is some smoothness (esp for canards)
top may actually lose.
Vance

Paul Lamar