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View Full Version : Ah-ha! CEM



XyZspineZyX
10-16-2003, 01:30 PM
Its really quite simple after all!

100% = prop tries to keep up with engine.
0% = engine tries to keep up with prop.

So, if 80% throttle puts RPM's at redline, decreasing prop pitch will put more strain on the engine by causing the prop to "bite" more air. The craft lurches forward because the prop and engine are doing more work

If I want to slow down quickly, I go with 100% prop pitch and 0% throttle.

Armed with a better understanding of CEM, I have finally retired my I-153 for a P-40E. I still love the nimble handling of the I-153, but the P-40 hauls *** when flown properly (compared to I-153, that is).


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Message Edited on 10/16/03 09:10AM by BaldieJr

Message Edited on 10/16/0310:50AM by BaldieJr

XyZspineZyX
10-16-2003, 01:30 PM
Its really quite simple after all!

100% = prop tries to keep up with engine.
0% = engine tries to keep up with prop.

So, if 80% throttle puts RPM's at redline, decreasing prop pitch will put more strain on the engine by causing the prop to "bite" more air. The craft lurches forward because the prop and engine are doing more work

If I want to slow down quickly, I go with 100% prop pitch and 0% throttle.

Armed with a better understanding of CEM, I have finally retired my I-153 for a P-40E. I still love the nimble handling of the I-153, but the P-40 hauls *** when flown properly (compared to I-153, that is).


<font face="Courier New">

_____ | _____
_\__(o)__/_
./ \.

</font>

Message Edited on 10/16/03 09:10AM by BaldieJr

Message Edited on 10/16/0310:50AM by BaldieJr

XyZspineZyX
10-17-2003, 01:49 AM
Now what about mixture and altitude huh? You forgot that! a;slo the super chargers?!

Throw those in too , not so simple.

BaldieJr wrote:
- Its really quite simple after all!


http://www.imagestation.com/picture/sraid79/p9141f290fa1c1c59a2dc382c77af21f3/fb1a8321.jpg


Lead Whiner for the P-47D-40, M and N and Hvars

XyZspineZyX
10-17-2003, 01:51 AM
Mixture control isn't in the P-40. Supercharger operation is simple - shift to gear 2 above 4000m, shift to gear 1 below 4000m.

http://www.mechmodels.com/images/klv_ubisig1a.jpg


Oh yeah, I'm a P-63 whiner too! /i/smilies/16x16_smiley-very-happy.gif

XyZspineZyX
10-17-2003, 02:03 AM
Korolov wrote:
- Mixture control isn't in the P-40. Supercharger
- operation is simple - shift to gear 2 above 4000m,
- shift to gear 1 below 4000m.
-
Well it does depend on what the plane had. Some 109's u can't make adjustment as they are automatic.

http://www.imagestation.com/picture/sraid79/p9141f290fa1c1c59a2dc382c77af21f3/fb1a8321.jpg


Lead Whiner for the P-47D-40, M and N and Hvars

XyZspineZyX
10-17-2003, 04:14 AM
It seems to me if I chop throttle and pitch I sloew down even faster.

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XyZspineZyX
10-17-2003, 04:40 AM
whats the rule of thumb with magnetos?

http://www.vfa25.com/sigs/griffon.jpg

XyZspineZyX
10-17-2003, 04:55 AM
If you expect the engine to run, leave at least one on. If you expect it to run well, leave them both on.

Am I missing something?

adlabs6
10-17-2003, 05:11 AM
Bearcat99 wrote:
- It seems to me if I chop throttle and pitch I sloew
- down even faster.

Same for me. Chopping the throttle is nearly useless on some planes.

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XyZspineZyX
10-17-2003, 05:16 AM
Sniper762x51 wrote:
- Well it does depend on what the plane had. Some
- 109's u can't make adjustment as they are automatic.

I meant for the P-40 specifically. But supercharger stages all follow that general rule - shift up at 4000m, shift down below 4000m. You're supposed to be able to get a performance boost if you shift to gear 2 at lower altitudes, but I'm too chicken to test that out.

http://www.mechmodels.com/images/klv_ubisig1a.jpg


Oh yeah, I'm a P-63 whiner too! /i/smilies/16x16_smiley-very-happy.gif

XyZspineZyX
10-17-2003, 05:39 PM
In the real world: Turn them on to both and leave on when operating the engine(s). Do mag checks before take off.If get a too big a drop on one abort. Engine(s) off: mag switch to off. In game: leave then on and don't mess w/ them. If you mess w/ them and someething good happens then that is definately wrong.

http://www.imagestation.com/picture/sraid84/pcf14831e07273a1e01a33fb0e5650ffa/face10c7.jpg


Lead Whiner for the P-47D-40, M and N and Hvars

XyZspineZyX
10-17-2003, 05:43 PM
Korolov wrote:
- Sniper762x51 wrote:
-- Well it does depend on what the plane had. Some
-- 109's u can't make adjustment as they are automatic.
-
- I meant for the P-40 specifically. But supercharger
- stages all follow that general rule - shift up at
- 4000m, shift down below 4000m. You're supposed to be
- able to get a performance boost if you shift to gear
- 2 at lower altitudes, but I'm too chicken to test
- that out.
-
On the He 111 it is 2500m and there are some russian fighters (I forget which) this is true too.

http://www.imagestation.com/picture/sraid84/pcf14831e07273a1e01a33fb0e5650ffa/face10c7.jpg


Lead Whiner for the P-47D-40, M and N and Hvars

XyZspineZyX
10-17-2003, 05:54 PM
Bearcat99 wrote:
- It seems to me if I chop throttle and pitch I sloew
- down even faster.
-

In the P40E? I thought the same thing, but found myself retaining too much speed on approach and landing a bit too 'hot' with pitch at 0%.

I'll re-test tonight. If I'm wrong, the modelling is wrong. With the blades turned to 100% pitch, it should offer more resistance to oncoming air.

As far as mix and supercharger questions: read the manual, this is clearly explained for each plane. The only thing that is not made clear is the effect of air-temp on mixture control, but I'm not sure ambient air-temp is even modelled.

<font face="Courier New">

_____ | _____
_\__(o)__/_
./ \.

</font>

XyZspineZyX
10-17-2003, 10:53 PM
BaldieJr wrote:
-
- Bearcat99 wrote:
-- It seems to me if I chop throttle and pitch I sloew
-- down even faster.
--
-
- In the P40E? I thought the same thing, but found
- myself retaining too much speed on approach and
- landing a bit too 'hot' with pitch at 0%.
-
- I'll re-test tonight. If I'm wrong, the modelling is
- wrong. With the blades turned to 100% pitch, it
- should offer more resistance to oncoming air.
-
- As far as mix and supercharger questions: read the
- manual, this is clearly explained for each plane.
- The only thing that is not made clear is the effect
- of air-temp on mixture control, but I'm not sure
- ambient air-temp is even modelled.
-
- <font face="Courier New">
-
- _____ | _____
- _\__(o)__/_
- ./ \.
-
- </font>


you are not wrong . it is backwards in the game. 100% in the game is flat pitch and 0% is max pitch. I use the "lower" pitch #'s to load up the engine and help slow down the engine. this works for me On jugs, cobras, La7's


http://www.imagestation.com/picture/sraid84/pcf14831e07273a1e01a33fb0e5650ffa/face10c7.jpg


Lead Whiner for the P-47D-40, M and N and Hvars

Buzz_25th
10-17-2003, 10:59 PM
The P-40 has a constant speed prop. It doesn't act anything like the German planes on manual pitch.

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