Model Boat Mayhem

Dry Dock / Shipyard: Builds & Questions => Springer Tugs => Topic started by: Martin [Admin] on August 06, 2008, 12:43:40 PM

Title: Gurney Strip & Rudders
Post by: Martin [Admin] on August 06, 2008, 12:43:40 PM
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)

Title: Gurney Strip & Rudders
Post by: Arrow5 on August 06, 2008, 01:11:07 PM
OK Martin give me a day or two. I`ll do a video comparison on Youtube.  It is info gleaned from the RCGroups experts.
Title: Re: Gurney Strip & Rudders
Post by: Arrow5 on August 06, 2008, 05:36:42 PM
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.
Title: Re: Gurney Strip & Rudders
Post by: Big Ada on August 07, 2008, 05:31:21 PM
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