[wellss]

I've constructed this airfoil. I don't know if it is accurate, since I haven't been able to find anything definitive. However, I've reversed engineered it based on what I could find. My research is here,

http://wellssullivan.blogspot.ca/201...g-section.html

To summarize, it's a 1% camber, reflexed airfoil, 14% in thickness with the thickest point at 36-37%. Feel free to use it, either on a Mosquito or something else and let me know how it goes! RCC won't accept dxf files?? You can get it here,

https://skydrive.live.com/redir?resi...D7AB8871%21169

[kip51035]

I have designed and used a very similar airfoil on quit a few aircraft. The slow speed qualities is excellent, as in as the speed slows down the stall slowly creeps forward from the back giving a gentle reduction in in lift as you slow down. The angle the air crashes together at the back causes a fairly large wake and as you drive it faster it becomes worse. With moderate RPM's on your engines and 4-5 or 6 pitch propellers it is excellent and maneuvers are great. The wing I used was straight and I made the last three inches on the bottom trailing edge flat which allowed me to build the wing straight while still attached to the table. With the Mosquito I would suggest that you do it with the top trailing edge and build the wing upside down. This will build in some washout making it more stable. Pin a couple of blocks to the leading edge to keep it straight and sheet the entire bottom while still on the table. You will find it is fairly ridged after the glue dries. I usually pin it back to the table being careful to maintain the twist with block under the trailing edge spar, then sheet the top of the wing. Do not forget to install all the linkages and wires first.

[kip51035]

The airfoil I am referring to is the one in the first link.

[kcaldwel]

For what it's worth, David Lednicer's "Incomplete Guide to Airfoil Usage" list the RAF 43 mod as the Mosquito airfoil;

http://aerospace.illinois.edu/m-selig/ads/aircraft.html

Th coordinates for the RAF 34 are available here:

http://aerospace.illinois.edu/m-seli...atabase.html#R

I'm not sure what the modifications where.

I imagine they used the slightly reflexed, low Cm airfoil to reduce the torsion load on the wing structure at high speed.

I've attached the gif file and the dat file. I renamed the dat file to a .pdf to upload it here. Just change the suffix from .pdf to .dat to return it to a dat file for use with most airfoil plotting and analysis programs.

Kevin

Edit: Added polars of the RAF 34 from Re = 50k to 500k. The airfoil has a very mellow stall, and would work reasonably well on a big model. The drag starts to increase markedly below Re = 100k. There seems to be laminar separation below Re = 100k or so. That might be a problem with the pointy tips of the Mosquito at low speeds. Perhaps thinning the airfoil to 8% at the tips would help at low Re?

[kcaldwel]

I stumbled across an interesting article about the RAF 34 in an old Soaring magazine:


http://soaringweb.org/Soaring_Index/...Jul-Aug_05.pdf

http://soaringweb.org/Soaring_Index/...Jul-Aug_13.pdf

Kevin

[wellss]

The RAF34 was combined with a Piercy section, as per the "Mosquito Manual". I have not been able to find drawings or coordinates as of yet ( I've contacted museums and restorers ). Hence, my research and conclusions thereof.

P.S. Piercy was an aerodynamics professor who wrote a textbook called "Aerodynamics" in 1947, I think it was. In there, he describes how to construct the airfoil shapes. The RAF 34 is just a generalized Joukowski type, with thickest point at 1/3 chord, wrapped around a cubic mean line.