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View Full Version : Hurricane: why does engine cut off when you nose it down?



drose01
03-08-2005, 12:03 PM
Does anyone notice that if you nose down a hurricane that the engine cuts off or revs down spontaneously?

Is this a bug or is there a reason why it should?

BaldieJr
03-08-2005, 12:06 PM
Its a huge bug left in by RUSSIAN developers who don't like the idea of BRITISH engineering being superior. Be sure.

Zeus-cat
03-08-2005, 12:13 PM
It is supposed to be there. It simulates the carburetor not getting any fuel when you pull negative g's. Same thing happens in one of the biplanes.

If you need to dive quickly, roll on your back and then pull back on the stick to bring the nose of the plane towards the ground.

Zeus-cat

Taylortony
03-08-2005, 12:15 PM
It is because the engine had a carburettor and not fuel injection, when the aircraft nosed down you pull negative G, this forced the fuel back from the carb and the engine cut until positive G or no G was resumed, A fuel injected Engine does not suffer this, Early Spits and Hurricanes used to roll inverted and maintain positive G in the dive..... The problem was cured by I believe a Mrs Shilling, A Rolls Royce or RAE Engineer and involved fitting a Restictor in the fuel line, a bit like a penny washer, this acted as a baffle and prevented the fuel flowing backwards.... It was as would be expected refered to on the Squadrons as Mrs Shillings Orifice................ Ignore Baldie, he has been left out in the sun to long again

Airmail109
03-08-2005, 12:16 PM
Well said TT! http://forums.ubi.com/images/smilies/88.gif

LLv34_Stafroty
03-08-2005, 12:20 PM
didnt let the fuel flow back, but.. still, fuel wasnt go in right way eighter.

F19_Ob
03-08-2005, 12:24 PM
This only happens in a few planes....
The early polikarpovs like I-16 and it can also happen in the swedish variant of the Gladiator (J8) or Fiat G50, and the hurricane as mentioned.
You can flood the engine so it cuts out.
If that happens, Idle the throttle and wait up to 10 -30 secs before trying to restart the engine again.
U can push the stick forward without cutting out if u have the throttle idle before u do it.

http://forums.ubi.com/images/smilies/16x16_smiley-wink.gif

Orfson
03-08-2005, 12:53 PM
Well, a nice, accurate feature of this simulation mistaken as a bug! http://forums.ubi.com/images/smilies/16x16_smiley-surprised.gif

TgD Thunderbolt56
03-08-2005, 01:13 PM
If you ever fly an F4 and find an I-16 sticking with you when you get jumped and suddenly go nosedown to use the gravity-fed carb of the Polikarpov to your advantage, know it's me.

I will almost invariably roll inverted right before I release my first volley. when you go nosedown "I" then have MORE control than you do...for about 3 seconds anyway...which is usually enough.


TB

reverendkrv1972
03-08-2005, 01:47 PM
why do the hurri's,spits & early zero NOT cut out in PF?

Rev

NORAD_Zooly10
03-08-2005, 03:55 PM
the neg fuel flow seems a little too overmodelled imo http://forums.ubi.com/images/smilies/784.gif

joeap
03-08-2005, 04:01 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by reverendkrv1972:
why do the hurri's,spits & early zero NOT cut out in PF?

Rev <HR></BLOCKQUOTE>

Umm the Hurri I DOES cut out, the later models were not effected. Only the Spit I was effected and we don't have it in the sim. The Zero cutting out in early versions of PF was a mistake that Oleg corrected when he got some info (documents and diagrams) from Japan.

turnipkiller
03-08-2005, 05:13 PM
The problem was not due to fuel actually leaving the carburettor, but caused by the floats in the fuel bowl closing the needle valve, thus starving the engine of fuel.
The device mentioned by Taylortony was actually placed inside the float chambers which allowed short negative-g manoevers. This device was fitted from March 1941 on. In 1942 an anti-g version of the SU carburetor was fitted to single and two-stage Merlins. 1943 saw the introduction of the Bendix-Stromburg carburettor which injected fuel directly into the supercharger.

mortoma
03-08-2005, 10:56 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by F19_Ob:
This only happens in a few planes....
The early polikarpovs like I-16 and it can also happen in the swedish variant of the Gladiator (J8) or Fiat G50, and the hurricane as mentioned.
You can flood the engine so it cuts out.
If that happens, Idle the throttle and wait up to 10 -30 secs before trying to restart the engine again.
U can push the stick forward without cutting out if u have the throttle idle before u do it.

http://forums.ubi.com/images/smilies/16x16_smiley-wink.gif <HR></BLOCKQUOTE>Also the Polish P-11C..........