Upcoming Patch FM Changes

[Sutts]

Originally Posted by klem

From Hurricane MkI Pilots Notes, Melrin II or III engine. This is a May 1941 edition - I haven't found an earlier one yet so it is possible that the combat advice differed during the BoB. I'll re-check the Library. However, the engines were the same.

Interesting stuff Klem, thanks for posting.

I find it quite hard to overspeed my prop - certainly not to 3600 RPM. Is there any situation on CloD where that kind of overspeed is possible?

[Robo.]

Originally Posted by Sutts

Interesting stuff Klem, thanks for posting.

I find it quite hard to overspeed my prop - certainly not to 3600 RPM. Is there any situation on CloD where that kind of overspeed is possible?

Not with the Rotol equipped Hurricane, these limits were set to the engine in general - Merlin II and III. Following airscrews have been fitted on Hurricanes of that era: Weybridge fixed pitch, de Havilland 2-pitch or Rotol constant speed. With the first two, you could indeed overrev your engine in a dive, hence the limit set in the pilot's manual. You will be able to overrev your engine in the sime flying de Havilland Mk.I fighters (Spitfire Mk.I and DH-20 Hurricane Mk.I),

klem - I do have great copy of Hurricane Mk.I pilot notes and maintenance manual dated March 1939, all pre-BoB Merlin II and III related. Great stuff, PM me if you'd care for a copy.

[Sutts]

Originally Posted by Robo.

Not with the Rotol equipped Hurricane, these limits were set to the engine in general - Merlin II and III. Following airscrews have been fitted on Hurricanes of that era: Weybridge fixed pitch, de Havilland 2-pitch or Rotol constant speed. With the first two, you could indeed overrev your engine in a dive, hence the limit set in the pilot's manual. You will be able to overrev your engine in the sime flying de Havilland Mk.I fighters (Spitfire Mk.I and DH-20 Hurricane Mk.I),

klem - I do have great copy of Hurricane Mk.I pilot notes and maintenance manual dated March 1939, all pre-BoB Merlin II and III related. Great stuff, PM me if you'd care for a copy.

Thanks Robo, I forgot it wasn't a constant speed prop on these early machines Dohhh! The reason I ask is that I've seen reference to overspeeding props in manuals for aircraft with constant speed units fitted and was wondering under what circumstances an overspeed could happen.

I guess slamming the throttle to max when going into a dive might not give the constant speed unit time to adjust?

[Robo.]

Originally Posted by Sutts

I guess slamming the throttle to max when going into a dive might not give the constant speed unit time to adjust?

Exactly.

[klem]

Originally Posted by Robo.

Not with the Rotol equipped Hurricane, these limits were set to the engine in general - Merlin II and III. Following airscrews have been fitted on Hurricanes of that era: Weybridge fixed pitch, de Havilland 2-pitch or Rotol constant speed. With the first two, you could indeed overrev your engine in a dive, hence the limit set in the pilot's manual. You will be able to overrev your engine in the sime flying de Havilland Mk.I fighters (Spitfire Mk.I and DH-20 Hurricane Mk.I),

klem - I do have great copy of Hurricane Mk.I pilot notes and maintenance manual dated March 1939, all pre-BoB Merlin II and III related. Great stuff, PM me if you'd care for a copy.

Thanks,

I've PM'd you.

[41Sqn_Banks]

@klem: Could you provide the paragraph that deals with the propeller pitch control, especially with regards to the handling of the DH two position pitch? Compare Spitfire I: http://www.il2bugtracker.com/issues/97

It would be important to know if the Hurricane had the same "bycicle pump" control like the Spitfire that allowed setting any pitch between "fine" and "coarse". So the images of the cockpit could also be interesting.

[klem]

Originally Posted by 41Sqn_Banks

@klem: Could you provide the paragraph that deals with the propeller pitch control, especially with regards to the handling of the DH two position pitch? Compare Spitfire I: http://www.il2bugtracker.com/issues/97

It would be important to know if the Hurricane had the same "bycicle pump" control like the Spitfire that allowed setting any pitch between "fine" and "coarse". So the images of the cockpit could also be interesting.

The Hurricane Pilots Notes I have (1941) give mid-r.p.m. settings for climb etc as you know from my previous post. Unfortunately the only reference to changing rpm is 'fully forward' or 'fully back' except where it says:

'Greatest Range.... 1700 r.p.m. '.....

'DIVING
(i) Generally, set the airscrew to govern at cruising r.p.m....'

'AEROBATICS
.... Cruising r.p.m. should be used....'

I'm sure as I can be that the Mk I prop control was a lever alongside the throttle and mixture (I don't have the notes to hand but I'll look tomorrow).

Opinion on these forums is that the 2-pitch prop lever couldn't be finely controlled like the Spitfire MkI plunger could. HOWEVER! The well respected 'Aviation Classics' magazine covered the Hurricane in its March 2012 issue so I will be getting that to see if there are any little nuggets in there. Its a great magazine, usually with pilot contributions.