Eric,
The EH airfoils do well on deltas if you use a small amount of up
trim to make the pitching moment slightly more positive. The up trim
will be negligible when flying at high speed, but more substantial at
slower speeds. Inverted flight will not be a problem with an EH
section.
Any of the EH series should work well for you. Pick the camber you'll
need based on the design lift coefficient, and the thickness based on
structural considerations. You can find the EH sections at
<http://www.halcyon.com/bsquared/EH.html>.
Once you've found the MAC, use a static margin of about 7.5% to
start. This setting will force you to use more up trim than will be
required once you have the CG moved to its proper location. You'll
probably find that you'll like a static margin of around 5% once the
'ship is trimmed out.
For a good MAC and CG location, plug your planform into the Panknin
formula. This can be done with a scientific calculator using the
formula at <http://www.halcyon.com/bsquared/Panknin.html>.
If you have any further questions, please ask!
>Anyone out there have an airfoil suitable for a small delta flying wing? Any
>CG (in relation to MAC) recommendations?
Try <www.traplet.com>. However, Traplet is once again redesigning
their web site, and so the information regarding QFI may not be
readily accessible.
>Anyone know if QFI magazine has a website?
B^2 B2Streamlines
Bill & Bunny Kuhlman 'specialty books for aircraft modelers'
[EMAIL PROTECTED] http://www.halcyon.com/bsquared/
P.O Box 975 P.O. Box 976
Olalla WA 98359-0975 Olalla WA 98359-0976
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