REFLECTOR: Prop dia

[John Dibble]

OK.  Now I understand.  I thought you were flying with the IVO with 72" 
blades.  As long as you get the same or greater static rpm with the IVO, 
your take off performance should be as good or better.  Check how many 
pitch limit washers on the forward end of the motor screw.  I'd take 
them all off, except for the rubber washer for max fine pitch adjustment.

John

On 6/6/2013 11:14 AM, Ron N VelocityXLFG wrote:
> 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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>
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