REFLECTOR: Second Flight and a reusable airplane

[John Dibble]

On 6/23/2012 4:15 PM, Chris Barber wrote:

I had coursed the prop a bit as to not again reach 3100 rpm. Airspeed 
was slower to build but was developing. When I hit 70 kts I pulled back 
and started flying. Wow. It was much more sluggish today but I was 
climbing while maintaining around 90 kts. I flattened the prop a bit and 
climbed a bit better.


Chris,

Increasing prop pitch to avoid high rpm makes about as much sense as 
starting a car from a full stop in second gear (with the accelerator 
floored) to avoid over-revving.  You can get about the same T/O 
performance by using full fine pitch with less throttle.  The advantages 
are 1) less abuse to your engine and 2) you don't have to make prop 
pitch changes during the T/O process.

John

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