REFLECTOR: Obtaining Repairmans Certificate - Static RPM

[John Dibble]

Brian,

2250 with 3 washers, 3 blades sounds about right.  I don't understand 
how you got 3000 rpm, unless that was with turbo, in which case it may 
be better to not use turbo for T/O.  You should have plenty of power 
without it.  Maybe you've figured out something that I don't understand, 
but it seems like the right approach is to remove washers, not blades.  FWIW

John
>
>
> I just wrote an update.  With three washers, I get 2250, but I for the 
> life of me can't remember my manifold pressure.  I'm strictly running 
> 28BTDC, so am losing some power there, and am also drawing air through 
> a non-boosted turbo.
>
> On my first flight I did see 3,000 RPM, so I don't want to remove any 
> more washers.  Once I finish the development of the constant speed 
> prop controller, I may remove the extra washers.
>
> On 03/20/2012 11:20 AM, Laurence Coen wrote:
>> With three blades and one washer I can get 2500 RPM static with my 
>> Franklin IVO.  High speed taxi test 2600+ RPM.  In testing for max 
>> cruse at 8000 ft I found a 2 KT increase from 2600 RPM to 2700 RPM 
>> and no increase at 2800 RPM. If it runs good at 2600 RPM you're golden.
>>
>> Larry Coen
>> N136LC
>>
>> --------------------------------------------------
>> From: "John Dibble" <aminetech at bluefrog.com>
>> Sent: Tuesday, March 20, 2012 10:58 AM
>> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>> Subject: Re: REFLECTOR: Obtaining Repairmans Certificate - Static RPM
>>
>>> Brian, There's something wrong if you can't get high rpm with 3 
>>> blades. What is your fuel burn rate at idle?
>>>
>>> John
>
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