> "BernieFlyer" gmail.com> wrote in message
> news:rs-dnWbbUNZVYCXVnZ2dnUVZ_rjinZ2d@westnet.com.au...
>

>> Alan Peake wrote:
>>

>>> BernieFlyer wrote:
>>>

>>>> Hi Team
>>>>
>>>> I have an IO 360 engine with a 3 bladed constant speed prop.
>>>>

>>> ........
>>>
>>>

>>>> I am interested in the views of those more of an engineering bent or
>>>> anyone who has a well informed view on the matter.
>>>>
>>>> Bernie
>>>>

>>> What does the manufacturer recommend?
>>> Alan
>>>
>>>

>> The manufacturer (Lycoming) allows quite a large range of settings. They
>> also say that "square" is a carry-over from radial engines but I guess
>> before I go against all that advice to keep the engine square I was
>> looking for some real world experience. Lycoming say that 2100 rpm with 24
>> inches is ok (with all sorts of combinations allowable) so I doubt there
>> is any short term issue. Its the long term effects of different settings
>> that I am interested in.
>>

>
> IIRC the IO-360 has full wedge rings. Run it square or over-square on
> cruise/let-down or suffer ring flutter and early ring/cylinder failure.
>
> Run it undersquare and you won't have any long term effects. You won't have
> any long term.
>
> They are my least favourite engine (except for a GSIO-540, of course :-)
>
>
>