Spitfire makes only 300 mph?

[Peril]

Originally Posted by Kurfürst

Looks like it's only a faulty boost gauge Than..



The thing about rpm is odd though. I believe you have to fly 3000/+12 to get max speed, less rpm should yield less power..

Not less power 'to the air' if your prop is entering compression FX due to high tip speeds. Power to the engine is one thing, transferring this to the prop/air another. The larger props in Targetware also had the same effect where props became inefficient in this manner at high RPMs..

Perhaps the props data/size is wrong if this is incorrect here?

Food for thought.

[Viper2000]

Originally Posted by Peril

Not less power 'to the air' if your prop is entering compression FX due to high tip speeds. Power to the engine is one thing, transferring this to the prop/air another. The larger props in Targetware also had the same effect where props became inefficient in this manner at high RPMs..

Perhaps the props data/size is wrong if this is incorrect here?

Food for thought.

Typical tip Mach numbers were around 0.9ish (column #6); typical prop efficiencies were around 70-80% (column #12/13), and shock losses were assumed to be about 7% (column #14).

[Redroach]

Originally Posted by reflected

I dare anyone to fly the Spit MK2 faster than that. It's supposed to make 350mph, but no matter how I adjust my prop, it jsut wouldn't go faster. The max speed I can reach in the MKI is about 250. What am I doing wrong? Full real except for temp.effects.

I know, it was at sea level

Heh, sorry, but I had to smile about that for a long time
Being a test pilot is not just "fly around somehow" and then bash the developers. You also have to get your physics right. You have to be the absolute master over your machine (and I seriously doubt anyone has already mastered CEM to the full extent) - and you have to be able to set reproduce-able conditions.

Well, the third point is not even conceivable right now from what I read here, but the first two... Guys, I'd respectfully suggest doing a lot more "flight schooling" before you jump to conclusions like "Plane XX is woefully undermodelled" or "They've got to get their flight models right". No, it's the other way round - people got to get their test flights right, judging from what has been written here.
I hope the devs don't jump to overly nervous conclusions... but, seeing they are all battle-hardened veterans with own flight experience, I shouldn't be too scared, I hope

P.S.: Oh, and as always on the internet: Screenshot or it didn't happen! ^-^

[reflected]

Originally Posted by Redroach

Heh, sorry, but I hat do smile about that for a long time
Being a test pilot is not just "fly around somehow" and then bash the developers. You also have to get your physics right. You have to be the absolute master over your machine (and I seriously doubt anyone has already mastered CEM to the full extent) - and you have to be able to set reproduce-able conditions.

Well, the third point is not even conceivable right now from what I read here, but the first two... Guys, I'd respectfully suggest doing a lot more "flight schooling" before you jump to conclusions like "Plane XX is woefully undermodelled" or "They've got to get their flight models right". No, it's the other way round - people got to get their test flights right, judging from what has been written here.
I hope the devs don't jump to overly nervous conclusions... but, seeing they are all battle-hardened veterans with own flight experience, I shouldn't be too scared, I hope

OK master test pilot, go ahead and fly it at 350 mph level!

The spit 2a should have a Merlin XII which ran at 9 lbs/ sq.in without boost cut-out. I believe that no plane would be fitted with a boost indicator that even doesn't show the nominal max boost. Currently the clock only shows 8 with boost cut-out. Also you have to have boost cut-out to exceed 6.2 lbs /sq.in

I think this is a bit strange. I think our Spit 2a is no Spit 2a but a Spit 1a with small modifications.

[*Buzzsaw*]

Originally Posted by 41Sqn_Stormcrow

The spit 2a should have a Merlin XII which ran at 9 lbs/ sq.in without boost cut-out. I believe that no plane would be fitted with a boost indicator that even doesn't show the nominal max boost. Currently the clock only shows 8 with boost cut-out. Also you have to have boost cut-out to exceed 6.2 lbs /sq.in

I think this is a bit strange. I think our Spit 2a is no Spit 2a but a Spit 1a with small modifications.

The graphics model is of a Spit II. It has the six exhaust stubs per side instead of three, and there are other elements.

However, it doesn't even have the performance of a historical BoB Spit Ia at +12.

[ICDP]

Originally Posted by *Buzzsaw*

The graphics model is of a Spit II. It has the six exhaust stubs per side instead of three, and there are other elements.

However, it doesn't even have the performance of a historical BoB Spit Ia at +12.

The Spitfire II did not have six exhaust stubs per side, it had three. Have you tested the MkII in CoD yet? At SL it is getting correct speeds even with only 9lbs boost, I haven't tested all other altitudes yet but so far it looks like only the boost is being reported wrong.

So far the indications are that the MkIs are not modelled correctly and the CSP is broken on the MkIa, they both underperform quite badly.

The 109E is also performing well below its actual real performance.

It seems there is a lot of work required on getting the FMs and performance fixed on most aircraft.

[Xiola]

Originally Posted by reflected

I dare anyone to fly the Spit MK2 faster than that. It's supposed to make 350mph, but no matter how I adjust my prop, it jsut wouldn't go faster. The max speed I can reach in the MKI is about 250. What am I doing wrong? Full real except for temp.effects.

It only goes 350mph at its fastest height.

If you are at sea level, I believe the top speed is 292mph

[Redroach]

Finally! The first one to realize that! *cheer*

[ICDP]

Originally Posted by Xiola

It only goes 350mph at its fastest height.

If you are at sea level, I believe the top speed is 292mph

292 at SL is Correct for a Mk IIa running +9 lbs
For a +12 lbs boost it should (and does) get around 310-315mph

Originally Posted by Redroach

Finally! The first one to realize that! *cheer*

Well spotted... I pointed out that the Spitfire Mk IIa was a +12lbs boost version on the first page of this thread.