REFLECTOR: Prop dia

[Ron N VelocityXLFG]

Motor is good   . I have been using my fixed pitch through the phase one 
and it works very well.
   I am turning my engine 5500 rpm to get a top speed of 180 knots So I 
got the IVo propeller on ebay and want to give it a try. It is a little 
long  76 diameter so I was thinking
of cutting it down. I will fly with it first to see what it is like 
before I cut it down.  Right now I like to cruise at 145 knots turning 
4200 rpm. My comfort rpm . My goal is to
run the engine at 4200 and cruise 160 knots with the hope of not too 
much loss in take off performance.

Ron


On 6/6/2013 10:49 AM, John Dibble wrote:
> I previously flew with 1" shorter blades (66" pitch) for more 
> clearance.  I couldn't quite use full power and stay below 2600 rpm.  
> So I went back to the 68" pitch recommended by IVO.  Now I can easily 
> get down to 2500 rpm at full power.  I think it would go lower, but 
> haven't checked.  1" change in blade length makes a big difference.  
> IVO shortened blades for me once.  Seems like your 72" blades should 
> work.  Have you checked that the motor is working good?
>
> John
>
> On 6/6/2013 10:30 AM, Ron N VelocityXLFG wrote:
>> Lower RPM at higher speed.  I have a email out to Ivo to see about 
>> making the blades shorter . Have not heard back yet.
>>  From past experience they are a little slow in response.
>>
>>
>> Ron
>> On 6/6/2013 8:10 AM, John Dibble wrote:
>>> On 6/5/2013 4:13 PM, Ron N VelocityXLFG wrote:
>>>> I have a 72 dia prop on my  XLFG I am going to try a 76 inch Dia 
>>>> Ivo propeller  and  I am a little concerned with the clearance . Seems
>>>> like I have plenty even with a high rotation angle. Is there any 
>>>> other concerns or advice out there for this configuration.
>>>>
>>>> Ron
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>>> If you do have ground contact, the blades are easily repairable or 
>>> you can cut a little off the ends.  My 220 HP Franklin uses a 68" 
>>> IVO prop.  76" seems like a lot.  What is the objective?
>>>
>>> John
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>
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