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frankm(at)clara.net
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 Posted: Mon Sep 02, 2013 9:59 am Post subject: Prop balancing |
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Does anyone know of someone in the UK who can statically balance an Arplast PV50 3-bladed propellor. I bought some re-conditioned blades when I damaged my own, but they came with an obsolete hub so I fitted them to my old, and much newer hub, but the result is more out of balance then dynamic balancing can cope with, so I need to start with static balancing. There is no point in trying Arplast as they don't seem to like English speakers and ignore them. Please reply to me direct.
Frank Mycroft
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grahamsingleton(at)btinte
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| Posted: Mon Sep 02, 2013 1:55 pm Post subject: Prop balancing |
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Frank
You can check the balance of each blade with an accurate (to 1/10th gram) balance.
Make a jig to carry the blade pivoted about the centre of the prop, then weigh each blade moment
at a point somewhere around 60% radius. Should be equal of course.
Simplest knife edge pivot would be a pair of nails through the wooden jig.
Jerry Davis printed a better description and diagram but I lost it years ago {{
Graham
From: Frank Mycroft <frankm(at)clara.net>
To: europa-list(at)matronics.com
Sent: Monday, 2 September 2013, 18:58
Subject: Prop balancing
Does anyone know of someone in the UK who can statically balance an Arplast PV50 3-bladed propellor. I bought some re-conditioned blades when I damaged my own, but they came with an obsolete hub so I fitted them to my old, and much newer hub, but the result is more out of balance then dynamic balancing can cope with, so I need to start with static balancing. There is no point in trying Arplast as they don't seem to like English speakers and ignore them. Please reply to me direct.
Frank Mycroft
[quote]http://www.matronics.com/Navigator_blank" href="http://forums.matronics.com/">http://forums.matronics.com</ rel="nofollow" target="_blank" href="http://www.matronics.com/contri===
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richard collings
Joined: 08 Jul 2011
Posts: 73
Location: warwickshire england
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| Posted: Tue Sep 03, 2013 2:58 am Post subject: Prop balancing |
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Hi Frank
CFS aero at Coventry Airport Baginton CV8 3BB Tel 02476 305873.
They were at the Rally and seemed able to cover most things see www.cfsaero.com
Regards Richard
From: Frank Mycroft (frankm(at)clara.net)
Sent: Monday, September 2, 2013 6:58 PM
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Subject: Prop balancing
Does anyone know of someone in the UK who can statically balance an Arplast PV50 3-bladed propellor. I bought some re-conditioned blades when I damaged my own, but they came with an obsolete hub so I fitted them to my old, and much newer hub, but the result is more out of balance then dynamic balancing can cope with, so I need to start with static balancing. There is no point in trying Arplast as they don't seem to like English speakers and ignore them. Please reply to me direct.
Frank Mycroft
[quote]
href="http://www.matronics.com/Navigator?Europa-List">http://www.matronhref="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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