Model Boat Mayhem
The Shipyard ( Dry Dock ): Builds & Questions => Springer Tugs => Topic started by: Martin (Admin) on August 06, 2008, 12:43:40 pm
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Re: "Gurney Strip" - if you get a chance Arrow5 I think we would like to see a comparison of like for like standard and Gurney Strip rudder!
Edit: Found a bit more info....
http://en.wikipedia.org/wiki/Gurney_flap
http://www.airliners.net/aviation-forums/tech_ops/read.main/198623/
http://www.patentstorm.us/patents/7338011/claims.html
From the original post by Arrow5:
http://www.modelboatmayhem.co.uk/forum/index.php?topic=11717.msg112871#msg112871
Glad you chipped in Bluebird, I second the tapering of the skeg and while in that area perhaps a longer(going towards bow) brass skid to accommodate two fixing screws. A sideways knock with your single wood-screw means the rudder gets strained as the brass strip moves sideways, maybe bending rudder shaft. Pity the rudder sticks out beyond stern, again prone to knocks. Consider a sheet brass rudder with the "salmon tail" or even just a T down the trailing edge. Details are buried somewhere in the RCGroups.com Springer pages. If you don't think it looks right do a Google search on "Gurney Strip" (yes Dan Gurney racing driver and car designer). I just file out the rivets on a standard (Ripmax?) rudder and replace the blade with a 2sq" brass sheet soldered in the slot. A vast improvement on "streamlined" rudder.
(http://www.modelboatmayhem.co.uk/forum/index.php?action=dlattach;topic=11717.0;attach=52752;image)
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OK Martin give me a day or two. I`ll do a video comparison on Youtube. It is info gleaned from the RCGroups experts.
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I should mention thet the US versions are not Gurney but called Salmon Tails, Some are wedge shaped, some diamond shaped but I think the principle is the same.
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Hi Guys,
Checkout Re Springer Tugs Reply 677.
This Rudder was sketched for me by Ron Birchett the Canadian Tug Captain and Modeler and it does what it says on the post.
Len O0 O0