SPIT MK I/II and over boost

[jf1981]

Hi,

I recently noticed that in the Spit, we can un-lock the throttle and make available higher boost than rated.

- Why does'nt it affect Spit 1 ?
- Why can we run constantly at max boost (2650 rev per sec) without any issue with the engine ?

TX

[Continu0]

some call it a feature, others a bug.

You have to wait for the next patch and hope it is fixed.

[SEE]

Boost doesn't function on Mk1 and Mk1a. A few claim it does but I reckon it's a placebo effect. I recall a post where the Boost figure was extracted from the FM and it adds 0.002 sq/in = zilch!

[jf1981]

Quote "Another important difference between the Bf109E and the Spitfire Mk.IA lay in the supercharger design. The early Merlin engines were equipped with gear-driven single-speed, single-stage units. The supercharger had to be throttles back at low altitude to avoid over-boosting the engine. As altitude increased, more and more of the supercharger capability was used and engine horsepower continued to increase until critical altitude was reached, after which power fell off rapidly"

http://theairtacticalassaultgroup.co...s-Spitfire-MkI

[Faustnik]

The biggest issue in the sim is radiators have no damage effect.

Hopefully that a lot of issues hill be fixed in the patch.

[41Sqn_Banks]

Originally Posted by jf1981

Quote "Another important difference between the Bf109E and the Spitfire Mk.IA lay in the supercharger design. The early Merlin engines were equipped with gear-driven single-speed, single-stage units. The supercharger had to be throttles back at low altitude to avoid over-boosting the engine. As altitude increased, more and more of the supercharger capability was used and engine horsepower continued to increase until critical altitude was reached, after which power fell off rapidly"

http://theairtacticalassaultgroup.co...s-Spitfire-MkI

This is wrong. Early Spitfire I were equipped with a fixed datum and later Spitfire I were equipped with a variable datum type boost control. Both limited the boost to +6.25 and therefore prevented over-boosting. +6.25 and 2600 PRM is "Climb power" which is allowed for 30 minutes.

Initially the boost control cut-out simply disabled the boost control to allow any boost up to around +17 at low level. Though the use of higher boost than +6.25 was only allowed when 100 octane fuel was used. (This is stated in a 1938 manual btw.!)

In 1940 when 100 octane fuel became available for operational squadrons the boost control cut-out was modified to disable the boost control but still limit the boost to +12 which was then allowed as emergency power for 5 minutes.

Reference: AP 1590B Merlin II and III Aero-Engines (October 1938, reprint October 1939).

[Basha]

As i have read elsewhere about the "Boost" the game should give Spits 100 octane fuel and 12lbs boost to be historically correct but has n't, will the next patch sort this issue ?

[Faustnik]

You are claiming that all Spits in 1940 use 100 Octane and 12 lb boost?

Spit boost in COD is not working. What for the patch when check speeds.

[fruitbat]

Originally Posted by Faustnik

You are claiming that all Spits in 1940 use 100 Octane and 12 lb boost?

Show me that the ones in 11 group weren't, during BoB.

I've read plenty of evidence that plenty were, but of course, i can't show that all important document they all were or weren't, which would finally end this debate one way or the other, because it may never existed.

However, it would be just as useful if someone could put up evidence that spits in 11 group weren't using 100 octane fuel during the BoB. Not squadrons that were on rotation out of 11 group, or in squadrons based in other groups.

I haven't seen any of that.

[TomcatViP]

Oh no ... another year of BS

you guys are really pushing us out of any flight Sim.

I don't fly RoF anymore and now shoot CoD only occasionally as there is no interest to fight those floating Spit MkIIa.

Great spirit!