 |
Matronics Email Lists Web Forum Interface to the Matronics Email Lists
|
View previous topic :: View next topic |
Author |
Message |
Gilles.Thesee(at)ac-greno Guest
|
Posted: Sat Sep 29, 2012 5:29 pm Post subject: Arplast PV 50 Prop |
|
|
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
| - The Matronics Europa-List Email Forum - | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
|
|
|
Back to top |
|
 |
paul.the.aviator(at)gmail Guest
|
Posted: Sat Sep 29, 2012 6:25 pm Post subject: Arplast PV 50 Prop |
|
|
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
====================================
target="_blank">http://www.matronics.com/Navigator?Europa-List
====================================
http://forums.matronics.com
====================================
le, List Admin.
="_blank">http://www.matronics.com/contribution
====================================
|
[quote][b]
| - The Matronics Europa-List Email Forum - | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
|
|
|
Back to top |
|
 |
Alan Carter
Joined: 02 Jul 2012 Posts: 378 Location: Kent, England.
|
Posted: Sun Sep 30, 2012 1:09 am Post subject: Re: Arplast PV 50 Prop |
|
|
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
| - The Matronics Europa-List Email Forum - | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
|
|
|
Back to top |
|
 |
Gilles.Thesee(at)ac-greno Guest
|
Posted: Sun Sep 30, 2012 2:37 am Post subject: Arplast PV 50 Prop |
|
|
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
| - The Matronics Europa-List Email Forum - | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
|
|
|
Back to top |
|
 |
Alan Carter
Joined: 02 Jul 2012 Posts: 378 Location: Kent, England.
|
Posted: Sun Sep 30, 2012 1:54 pm Post subject: Re: Arplast PV 50 Prop |
|
|
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
| - The Matronics Europa-List Email Forum - | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
|
|
|
Back to top |
|
 |
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|