One thing I've noticed in winglet discussions and proplet discussions is that if the devices aren't designed properly they can cause a degradation in performance instead of an improvement. That hasn't stopped me from playing with winglets but I'm not real confident about getting positive results.
----- Original Message -----
From: Eric
To: Indoor_Construction_at_yahoogroups.com
Sent: Tuesday, January 25, 2011 1:35 AM
Subject: [Indoor_Construction] Re: Winglets on props?
Thanks to all for the replies and insight. I can't say that I'm surprised so many people thought of this before I did. Sounds like the jury is still out on something like a LPP prop, but otherwise not beneficial.
Sooo...., who has thought of putting spiroids on their planes?
http://www.flightglobal.com/blogs/as-the-croft-flies/2009/05/gratzers-spiroids-in-flight.html
http://www.flightglobal.com/blogs/flightblogger/2008/06/spiroid-wingtip-technology-the.html
Eric Monda
--- In Indoor_Construction_at_yahoogroups.com, Phedon Tsiknopoulos <phedon21t_at_...> wrote:
>
> The vortex generated at the prop tip is insignificant. Any device added there
> even if it would elimiminate it would interfere significantly with tip velicity
> and reduce the time aloft especially towards the end of the run. Also don't
> forget that the anti-vortex device has to be fairly large in order to work. In
> my opinion it might be wiser to experiment with wing tip winglets. Ciao,
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
> Phedon
>
>
>
>
> ________________________________
> From: Brett Sanborn <bsanborn_at_...>
> To: "Indoor_Construction_at_yahoogroups.com" <Indoor_Construction_at_yahoogroups.com>
> Sent: Sun, January 23, 2011 6:02:16 PM
> Subject: Re: [Indoor_Construction] Winglets on props?
>
> Â
> Eric,
>
> I looked into this a bit before the world champs in an effort to gain an edge on
> the competition. I asked a guy who was in a phd program for aerodynamics and he
> thought that it could work but didn't have a real good reason as to why. Â After
> that I did a quick lit review but found surprisingly little information. When I
> was searching, however, I did see that a small airplane company made a prop that
> had about a 2 inch tip on the end, at a right angle like you're talking about.
> They didnt note an increase in efface
>
>
> On Jan 23, 2011, at 8:47nc PM, "Eric" <ewmonda_at_...> wrote:
>
>
> Â
> >Has anyone experimented with adding a "winglet" to the tip of a prop? Seems like
> >it should be analagous to tip plates on the ends of our wings, but I'm sure
> >there is a reason I've never seen one.
> >Thanks,
> >Eric Monda
> >
> >
>
Received on Tue Jan 25 2011 - 09:06:08 CET