REFLECTOR: Second Flight and a reusable airplane

[Douglas Holub]

Or it would be like taking off with a fixed pitch cruise prop. You need more 
runway, but the RPMs will be lower and Chris was concerned about over 
revving the engine.

----- Original Message ----- 
From: "John Dibble" <aminetech at bluefrog.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Sunday, June 24, 2012 7:36 AM
Subject: Re: REFLECTOR: Second Flight and a reusable airplane


> 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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