Rob
The ts section is not particularly good. Tom arrived at it by chasing the pressure profile rather than a derived camber to get the ideal camber. I tried what he did and got similar ordinary results. The 07 series has a mathematically derived camber line so is about as good as you can get for a near constant pressure profile.
I did a comparison of the ts P30120 section against the NACA07310 and a NACA0012:
The 07 series has a wider working range than the ts P series and much lower drag. They should be designed to operate with a Cl of around 0.3 so will have heaps of reserve. Their operating angle would be only a few degrees.
I am putting together a VPP for Dennis's test proa. If he eventually settles on some hull shapes I will get on with it. I want to look at the merit of different ideas I have and the best way is to analyse over a range of conditions rather than speculate. I have found that what seem good ideas are not so good once analysed.
Rick
On 09/08/2010, at 10:30 PM, Rob Denney wrote:
On Mon, Aug 9, 2010 at 1:37 AM, bjarthur123 <bjarthur123@yahoo.com > wrote:i wonder whether there has been any more development since. in particular i wonder whether any boats have been built with such rudders and what control system they are using. that search is next on my long "to do" list...
I built Speer foils for one of the test bed harrys. Set up to rake them aft to get the balance correct. Tiller steered. I found that when they were turned one way, flow stayed attached and they were great. The other way, the flow seperated much earlier and they were hopeless. Could have been lousy shaping, but I have never had problems with NACA foils built the same way.They were not high on my to try list as the NACA 0012 skeg rudders are working well. Thanks to Rick, Todd, BMWO, those bloody mothies and sundry other contributors to this site, the "to try" list is getting way out of hand. Look forward to seeing some new results.Moved the Sol hulls and beam out of the shed and onto the grass today for assembly when the mast os built. Bit of a task single handed, but nothing got dropped. Start sanding and painting El on Thursday.rob
Rick Willoughby
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