REFLECTOR: Obtaining Repairmans Certificate - Static RPM

[John Dibble]

Yeah, that clears up a lot.  I was concerned that you were planning to 
fly with 2 blades.  Glad that's not the case.  Have you installed the 
standard toggle switch that varies prop pitch?

John

On 3/30/2012 10:15 AM, Brian Michalk wrote:
> Ah, I think I understand your confusion.
>
> I reconfigured to two blades, three washers a few months ago just for 
> static ground testing, and was able to get to about 2500RPM.  Last 
> weekend I switched to one washer.  With that, I could get 2750, 
> occasionally surging to 2800 because of the turbo.  I'm planning to 
> reconfigure back to three blades, three washers this weekend and do my 
> weight and balance.
>
> I learned a few things with my high power ground testing last week.  
> Seeing the behavior in static tests with the two bladed prop, I now 
> know that I was boosting on the first flight, which was three washers, 
> three blades.  The wastegate was wide open, but it still presents a 
> restriction causing the turbo to make just a little bit of boost.
>
> Regardless, I think Deeter, who runs the same configuration as me can 
> also redline his RPM after takeoff if he doesn't dial in more pitch.
>
> Man, that first flight three years ago was a kick in the pants.  I've 
> never piloted an airplane that climbed (almost) to pattern altitude 
> before leaving the airport boundary.
>
> On 3/30/2012 9:22 AM, John Dibble wrote:
>> 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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