hi all what are the current wing sections for high speed models

Dirk Pflug Custom is good for 446mph.
http://dskinetic.com/

Those 446 mph speeds are highly suspicious and possibly erratic by the measurement devices used.

Of course, erratic measurement could mean the speeds were higher than 446mph.

In any case, the airfoil is probably good for "high speed models" however you define high speed.

Hi Stu62,

If your question is general rather than looking for specific foils: you want to be looking at skinny foils with minimal camber. Looking at the polars and lift curves you want something with low drag at low CL. A low Cl-max isn't a problem.

I would suggest modern foils that have been designed by computer-modelling the drag, SD, MH, AG etc... but alot depends on the type of construction your planning and the level of accuracy you can work to.


Jon

Those speeds are ground speeds..not air speeds.

Foils could be this; http://www.ae.illinois.edu/m-selig/a.../naca65210.gif or more modelling foil; http://www.worldofkrauss.com/foils/1180

does it have flaps up at high speed...then this; http://www.mh-aerotools.de/airfoils/mh23koo.htm

What sort of high speed application?  Dynamic soring, pylon racing, speed record flights, turbine jet scale models?

the sort of model is about 80" span large scale pylon

Being a pylon racer.... and by this you mean that it will actually be used for pylon racing and not just as a scale model ... then you need an airfoil that has some camber to allow for tighter turns without reaching too high a lift coefficient where the drag piles up. But at the same time you want an airfoil that still shows low drag coefficients at Cl's of around zero since a lot of the time in the "straights" between turns you're going weightless and therefore have zero lift. So you want an airfoil with some camber but not too much and with a thickness that meets your rules. Without the rules you're operating under there's no way to pick an airfoil for you.

A good place to start would be the Martin Hepperle website where he's done some airfoils intended for racing and higher speed applications.

http://www.mh-aerotools.de/airfoils/...ylonracing.htm

the rules for the models are just to look like the 3 view no wing thickness are in the rules one model fixed gear on fuz other 1 with retracts

Then anything thin with up to around 2% camber will do nicely as long as you can fold the landing gear into it and make it strong enough to withstand the very high G loads of high speed #1 pylon turns. 

Don't discount this G load.  Do the numbers for the sort of turn radii you see at these events and the speed.  The last time I did such a thing for a Quickie 500 model I was seeing G load numbers of around 30 to 35 depending on the radius estimate of the turn.  And my buddy wondered why his wing exploded when he pulled up too strongly in the turn.... 

Over engineering the wing spar design in such models is not time or weight badly spent.