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Arplast PV 50 Prop
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Gilles.Thesee(at)ac-greno
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PostPosted: Sat Sep 29, 2012 5:29 pm    Post subject: Arplast PV 50 Prop Reply with quote

craig a écrit :
Quote:


If you look at the current "production" aircraft both fixed wing and rotor
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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paul.the.aviator(at)gmail
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PostPosted: Sat Sep 29, 2012 6:25 pm    Post subject: Arplast PV 50 Prop Reply with quote

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:
Quote:
--> Europa-List message posted by: Gilles Thesee <Gilles.Thesee(at)ac-grenoble.fr>

craig a écrit :
Quote:
--> Europa-List message posted by: "craig" <craigb(at)onthenet.com.au>

If you look at the current "production" aircraft both fixed wing and rotor
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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Alan Carter



Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

PostPosted: Sun Sep 30, 2012 1:09 am    Post subject: Re: Arplast PV 50 Prop Reply with quote

Hi.
Strange you should say that, a flock a microlights from France landed at Headcorn yesterday, and some had fixed 6 bladed propellers.
Two 3s bolted together.
Alan


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Gilles.Thesee(at)ac-greno
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PostPosted: Sun Sep 30, 2012 2:37 am    Post subject: Arplast PV 50 Prop Reply with quote

Alan Carter a écrit :
Quote:


Hi.
Strange you should say that, a flock a microlights from France landed at Headcorn yesterday, and some had fixed 6 bladed propellers.
Two 3s bolted together.


Hi Alan,

Supposing you're answering to the pros and cons of multblade props.
As you may already know, the presence of a device on a microlight is no
guarantee that there has been a proper engineering study beforehand.
I have already seen such a setup. I'd say it is just what it looks like
: two 3-blade props quickly bolted together...Do you really believe the
'designers' did any calculations, activity factor or disc load
computations ?

Best regards,
--
Gilles
http://contrails.free.fr


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Alan Carter



Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

PostPosted: Sun Sep 30, 2012 1:54 pm    Post subject: Re: Arplast PV 50 Prop Reply with quote

Hello Gilles.
Do you really believe the
'designers' did any calculations, activity factor or disc load
computations ? Probably not, but Take a look at the Europe,s stabilator control components did an engineer really design that load of holes pins nuts and washers , I think we better stay with prop for now as i would like to start this as a new topic later as it may bring a number of posts..

Regards
Alan


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