|
| If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|||||||
|
|
Thread Tools | Display Modes |
|
#11
June 3rd 08, 07:18 PM
posted to rec.aviation.piloting,alt.usenet.kooks,alt.alien.vampire.flonk.flonk.flonk
|
|||
|
|||
Ram air
On Jun 3, 10:18 am, "Ken S. Tucker" wrote:
I wonder if ram scoops were ever installed near the prop tips. Probably too expensive for GA, but a WW2 A/C with tips spinning at what(?) 500-600 mph would give a nice pressure boost. I've read dual phase superchargers were used in recon A/C to get the speed and altitude. Airspeed off the tips is the same as the speed off the inner blade areas, due to the pitch washout across the blade span, so there'd be no advantage to having scoops behind the tips. The propeller's blades are flying at an AOA of between 2 and 4 degrees in cruise flight, anywhere between the tips and hub, because of that pitch variation. See Figure 6-4 of this page: http://www.allstar.fiu.edu/aero/flight63.htm Dan 
|
| Thread Tools | |
| Display Modes | |
|
|
Threaded Mode