P-39 Whining noise during taxi?

Hear for your self at the end of this video

http://www.youtube.com/watch?v=YL3CGztqe3s

Thanks for that B VI, I did wonder.
Glad ‘Miss Velma’ was passed fit in time.

I am advised that:-

…the whining noise from P39/P63 is the reduction gearbox, not the drive the shaft. The sequence is, engine – drive shaft – intermediate bearing – drive shaft – reduction gearbox, which brings the line of drive from the engine up to the line of drive for the prop shaft.

Mark

The hollow prop-shaft, with the cannon barrel (or reasonable facsimile) protruding through the center.

NOISE.

P-39 noise is, as has been stated,the reduction gearbox.

P-51 noise was the ground test rig not the aircraft.

Flying Legends….Can any knowledgeable person tell me what the whining noise was caused by in the P-39 while taxing. Was this the driveshaft? Does the P-63 have the same noise. I only noticed this while it was taxing & not when flying.
All aircraft make noises of some sort so I assume this to be normal for the P-39.

are you sure it just wasn’t a **** with a step ladder after being asked to move;)

Just read JJ’s reference to Lee Proudfoot and quite agree, all of the OFMC pilots are in the Ray Hanna mould.
Bernard Chabbert referred to Ed Shipley as the best P-51 driver in the world, and I wouldnt disagree, but I’d add Alistair Kay to the list of contenders, I love his displays in ‘Ferocious Frankie’.

That was sunday, he did appear to be a smidge over the crowd.

Back to the original theme of noises, I was surprised at the racket the P-51’s undercarriage makes whilst being cycled.
I had just arrived at Legends on sunday to see ‘Miss Velma’ jacked up and having her undercarriage attended to under the watchful eye of Mr Grey, Steve Hinton and Ed Shipley.
Whilst the undercarriage is in motion, there is quite a high pitched noise which obviously wouldnt normally be evident whilst flying.

By the way, I hope ‘Miss Helen’ is on the mend.

The cats were short lived following a mis-judgement from the F4F and subsequent summonds to land

Was that Saturday or Sunday? I was in the friends enclosure on Saturday and he seemed to get out of kilter on the first loop with the Hellcat. Looked horrid.

I am advised that:-

…the whining noise from P39/P63 is the reduction gearbox, not the drive the shaft. The sequence is, engine – drive shaft – intermediate bearing – drive shaft – reduction gearbox, which brings the line of drive from the engine up to the line of drive for the prop shaft.

Mark

Thanks for all the replys.
We also thought that the three oldies…P-36, P-39 & P-40B were excellent performers. Congratulations to all involved in getting them airborne.
Allison’s do sound great! Along with the others of course. One better than the next. Pure Music!

P-39 and the rest

The noise is the from the prop-shaft which negotiates under the floor of the cockpit to a drive system aft of the pilot.
P-63’s make the same sound.

I think the P39 was flown in a spirited way and made up for a comparitively poor sequence of displays on the sunday afternoon.

The cats were short lived following a mis-judgement from the F4F and subsequent summonds to land and the Spitfire sequence was bity – apart enjoying the progressively brillliant display by Lee Proudfoot in 434.
I think he is the one to watch in the next few years!!!

I still think 2000+2001 were the best FL events – from a display sequence point of view.

Its time to refresh the displays and themes. If I had the time I would shake up the order of play.

Something had to be wrong with the engine it was the roughest sounding Allison engine Ive ever heard in that it was verging on sounding like a Griffon. And when compared for example to that Blue Yak 3A which sounded super smooth it was clear to notice the difference.

Yes and talking of that Yak, is that a mighty impressive plane or what! Diving down at the start of its display it must have been hitting nearly 500 mph and making possibly the sweetest sound an Allison has ever made!

Flying Legends….Can any knowledgeable person tell me what the whining noise was caused by in the P-39 while taxing. Was this the driveshaft? Does the P-63 have the same noise. I only noticed this while it was taxing & not when flying.
All aircraft make noises of some sort so I assume this to be normal for the P-39.

Propshafts don’t normally make any noise, but straight cut gears whine like hell; is there a gearbox inline to align the shaft with the propellor?

More worryingly, didn`t anyone notice the serious misfire or detonation that the French P-40 had on Sunday?
It did it during its entire take-off run and during much of the display.

Apparently it had been worked on on Saturday at some point, but I don`t know if there is a connection.

Pete

Something had to be wrong with the engine it was the roughest sounding Allison engine Ive ever heard in that it was verging on sounding like a Griffon. And when compared for example to that Blue Yak 3A which sounded super smooth it was clear to notice the difference.

More worryingly, didn`t anyone notice the serious misfire or detonation that the French P-40 had on Sunday?
It did it during its entire take-off run and during much of the display.

Apparently it had been worked on on Saturday at some point, but I don`t know if there is a connection.

Pete

Yes, I had always thought it was the pilot complaining that his slot wasn’t long enough.

*cues up punch line from very old joke*

the whining noise can’t have been the cabin crew as it doesn’t have any.

I’ll get my coat

Yep I noticed this also.

Did anyone else see what appeared to be quite a nasty fuel/coolant leak gushing out from the underneath of the fuselage?

Quite normal; our P-63’s made the same noise too. I should think the engine noise drowns out a lot of it when flying.

I’m fairly sure that after it had taxied past their position on the flight-line, one of the guys on commentary said that the whining was indeed caused by the prop shaft…

Cheers

Peter D Evans
LEMB Administrator