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XyZspineZyX
11-08-2003, 03:59 PM
I found this site, it has a lot of flight procedure infos about the P-51:

http://nasaui.ited.uidaho.edu/nasaspark/safety/cover.htm

One thing I found very interesting is this:

"Flight restrictions are: no "power-on" spins; no snap rolls; inverted flying should not exceed 10 seconds (there will be a loss of oil pressure and failure of the scavenge pumps to function properly in inverted position); "power-off" spins are acceptable as long as spins occur above 12,000 feet."

Now I wonder if the Mustangs engine works properly when flow upside down in FB?

Was there a similar restriction on other planes for the same reason? Or was this unique with the Merlin engine?

XyZspineZyX
11-08-2003, 03:59 PM
I found this site, it has a lot of flight procedure infos about the P-51:

http://nasaui.ited.uidaho.edu/nasaspark/safety/cover.htm

One thing I found very interesting is this:

"Flight restrictions are: no "power-on" spins; no snap rolls; inverted flying should not exceed 10 seconds (there will be a loss of oil pressure and failure of the scavenge pumps to function properly in inverted position); "power-off" spins are acceptable as long as spins occur above 12,000 feet."

Now I wonder if the Mustangs engine works properly when flow upside down in FB?

Was there a similar restriction on other planes for the same reason? Or was this unique with the Merlin engine?

XyZspineZyX
11-08-2003, 07:56 PM
~S!

No, the machine didn't have an inverted oil system, so in negative G there was no oil circulating in the "bottom end". The result is the main bearing run dry in a few seconds and the engine then has a bunch of metal circulating.

The reason they didn't use 'em was too much weigth and not enough room. Don't know of any fighters that had inverted systems.



BPO5_Jinx
C.O. Replacement Air Group
Birds of Prey. 16th GvIAP
http://www.birdsofprey16thgviap.com ( <A HREF=)" target=_blank>http://www.birdsofprey16thgviap.com</a>
http://www.soaridaho.com/Schreder/RS-15/N50GL.html ( <A HREF=)" target=_blank>http://www.soaridaho.com/Schreder/RS-15/N50GL.html</a>

BPO5_Jinx
C.O. Replacement Air Group
Birds of Prey. 16th GvIAP
http://www.birdsofprey16thgviap.com
http://www.soaridaho.com/Schreder/RS-15/N50GL.html

XyZspineZyX
11-08-2003, 10:16 PM
Thanks for the link !!

I like this bird but my kid is just crazy about this plane.


Brazil Salutt !!

XyZspineZyX
11-08-2003, 10:18 PM
Ummmm...we will find it out later if can make create tactic to their disadvange.

Regards
SnowLeopard

XyZspineZyX
11-08-2003, 10:46 PM
From what I understand, radial engines all have intrinsicly invertable engines. However, I understand they are also vulnerable to hydraulic lock when off, where oil collects in the tops of the lower pistons, and prevents the engine from turning over correctly.

Harry Voyager

http://groups.msn.com/_Secure/0YQDLAswcqmIpvWP9dLzZVayPXOmo6IJ16aURujNfs4dDETH84 Q6eIkCbWQemjqF6O8ZfvzlsvUUauJyy9GYnKM6!o3fu!kBnWVh BgMt3q2T3BUQ8yjBBqECLxFaqXVV5U2kWiSIlq1s6VoaVvRqBy Q/Avatar%202%20500x500%20[final).jpg?dc=4675409848259594077

XyZspineZyX
11-08-2003, 10:51 PM
Republic stated in their '43 training film for the USAAF that the P-47D was not permitted to fly inverted for more than was required to perform a particular aerobatic manevuer due to lack of oil pressure when inverted. However - Grumman's training film made no reference to anything of the sort for the F6F Hellcat. Both were P&W R-2800 Double Wasps. Not sure if they were different sub-versions or not though.

As for any fighters having inverted oiling systems.....the Bf-109 had thier engines mounted inverted. So while the plane was level, the ending was upside down. I don't think they had any kind of G limitations as far as engine operation was concerned.