Author Topic: MW 50 and GM1 (Read 802 times)

Wilbus · « **on:** June 10, 2002, 10:10:22 AM »

Are they at all existant in AH in any plane???

MANDOBLE · « **Reply #1 on:** June 10, 2002, 11:49:47 AM »

Yep, in the La7

Wilbus · « **Reply #2 on:** June 10, 2002, 12:27:41 PM »

LOL!!

Well, actually, that's the unknown RATO

Karnak · « **Reply #3 on:** June 10, 2002, 02:07:46 PM »

The Bf109G-10, Fw190D-9 and Ta152H-1 all have MW50 in AH. I'm not sure about GM-1.

DarkglamJG52 · « **Reply #4 on:** June 10, 2002, 02:56:22 PM »

Quote

Originally posted by MANDOBLE
Yep, in the La7

LOL!!

Kevin14 · « **Reply #5 on:** June 12, 2002, 06:38:23 PM »

How do you enable MW50 in the D9, I'm dying to get better with it. I can only get about 325mph at 8k and not much faster high up.

Did D9 have GM1 in any versions?
Were GM1 and MW50 liquid or gas fuel?
Were GM1 and MW50 used in conjunction with the fuel or used
separately?
And finally, why do you drain the AFT tank to 25% first?

If anyone can answer my questions I'd be grateful

Naudet · « **Reply #6 on:** June 13, 2002, 01:44:29 AM »

Yes Kevin, the D9 had MW-50 boost, also in some testmachines GM-1 was added, but never used operational..

And to give you a better idea what MW-50 and GM-1 are i will give a short description:

MW-50: It means Water-Methanol, and the 50 simply means its 50% water mixed with 50% Methanol.
This mixture is injected into the engine together with the fuel. It enables the engine to run at higher boost pressure. This increases the poweroutput. Also the water cools the engine down and in this way allows to run the engine relativly long on the increased power.

GM-1: Its Stickoxyduhl (at least in german) or N²O. This was also injected together with the fuel. The main function of GM-1 boost was to ack as a Oxygen carrier. That means it should add Oxygen to the engine at high alt and so boost it power there. Power boost was linked to the injection rate of GM-1, the more was injected the more extra power the engine would give.

And about 325mph at 8K is that IAS(the white speed arrow) or TAS(the little red marker)?
You can use WEP in most planes, and the D9 features it too. I think default key is "p".

You drain the aft tank to 25% 1st to keep your CG "forward".
If you drain the forward tank 1st the CG moves aft and that destabilizes the D9 in loops and low speed moves.

butch2k · « **Reply #7 on:** June 13, 2002, 02:25:55 AM »

Hummm the MW50 do not really cool the engine, it cools the mixture and act as anti-knock. The engine get as hot with MW50 as with 110% WEP. As a side note the time between overhaul of a DB605ASM was just 12 hours due to the increased stress caused by the higher temperature experienced by the cylinders and pistons.
On a test bed with more than adequate cooling it was possible to run a DB605D with MW50 boost for as long as 10 minutes before sereve overheat caused engine trouble. In real planes the time was reduced to about 3 minutes due to inneficient cooling.

Naudet · « **Reply #8 on:** June 13, 2002, 04:12:33 AM »

Might be true for the DB605.

The JUMO213 was cleared for 10 minutes use of MW50 from the TAM (Technischer Aussendienst Motorenbau) in the D9.

But i think as with every Emergency Boost setting the pilot had to keep a sharp eye on the instruments, especially the engine temperature.

butch2k · « **Reply #9 on:** June 13, 2002, 04:25:26 AM »

Yes the DB605D was also cleared for 10 minutes but the engine blew up after just 4-5 minutes running with MW50... Discepencies between the constructor data and the realities of manufacturing during wartime with lower part quality than expected. It was probably the same with the 213.

Naudet · « **Reply #10 on:** June 13, 2002, 04:41:39 AM »

As i said, the pilot must have had a real sharp eye out for the engine temperature.

And as it gave engines that blew up after just 3 mins, others ran for much longer than the 10 minutes.

It is all about engine quality and luck.

Dr Zhivago · « **Reply #11 on:** June 13, 2002, 05:02:51 AM »

Who knows what bomber(s) was fitted with GM-1

Naudet · « **Reply #12 on:** June 13, 2002, 05:33:21 AM »

Possibly the JU88, i know that some nightfighter variants used GM1 injection and if i remember right the JU88S (fast bomber) used GM1 also.

Dr Zhivago · « **Reply #13 on:** June 13, 2002, 06:57:52 AM »

Thx Naudet
I was thinking that some Nachtjäger carried that boost system but wasnt sure. My source says that Ju88 S-1 used BMW 801 G with GM1 boost (fuel tank was placed to rear part of bomb bay). Same source claims that GM1 was additional equipment at Me410 A1...

Wilbus · « **Reply #14 on:** June 13, 2002, 07:28:54 AM »

Will check it out Zhivago.