Hi all, I am just curious to understand if a 3 blade propellor is more
efficient at higher altitudes, aka >12k. Thanks, Paul
On Saturday, September 29, 2012, Gilles Thesee wrote:
> Gilles.Thesee@ac-grenoble.fr>
>
> craig a =E9crit :
>
>>
>> If you look at the current "production" aircraft both fixed wing and rot
or
>> they are all moving to 5 blades or
>> More, Personally I think that speaks volumes.
>>
>>
>
> Craig, Karl and all,
>
> Karl gave a good number of the pros and cons of 2-blade vs 3-blade.
> As has been stated, drag is also to be taken into account, as well as
> propulsion efficiency.
> The main advantage of 3-blade props with small engines is reduced
> diameter, for ground clearance or reduced tip speed (= noise and drag).
> That's why 3 or more blades are used on airplane when noise reduction is
at
> a premium.
> Apart from the above, there are few engineering reasons for adding more
> blades on low power aircraft. (100 hp is not much for an aero engine).
>
> Best regards,
> --
> Gilles
> http://contrails.free.fr
>
>
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