Author Topic: 30kg Weapons, Methanol and Fuel tanks on N1K2-J (Read 758 times)

FDutchmn · « **on:** May 20, 2002, 08:28:59 AM »

reading further on on the N1K2-J....

On page 186 of ShidenKai and Its Data on Its 99 Mysteries (ISBN4-576-95141-6) , it says that the ShidenKai was able to load the Mark 3 bombs and Mark 7 bombs. These were the aerial bombs and the unguided A to A missle respectively. I suspect that these were modelled after the German ones. Would anyone know any details to these weapons?

Second question is while I think this was loaded on the N1K2-J and the N1K1-J (as per ShidenKai and Its Data on Its 99 Mysteries (ISBN4-576-95141-6) and "Fighter: Shidenkai" by Y. Ikari, 1975), a 30kg weapon is not mentioned in Kawanishi N1K2-J gGeorgeh Shiden-Kai (ISBN4-499-22711-9) for some reason. I am kinda wondering why.

Thirdly, on page 80 there is a diagram of the location of the fuel tanks on the N1K2-J, There were the forward tank (270 liters), aft tank (260 liters), right and left wing tanks each of 160 liters. On AH right now there is only the left and the right tanks. This could be corrected.

Lastly, on this page, there is a 140 liter methanol tank of which I am not sure what this was used for. Would anyone know?

Wilbus · « **Reply #1 on:** May 20, 2002, 09:05:23 AM »

The 140 liter Methanol tank is used when you use WEP on some planes. Most German planes had/could have it. Water Methanol injection, cools down etc, not quite sure how it works and what it does, it uses it during extra bursts though. That AUX tank in the 190 A8 was usually filled with Methanol instead of fuel as in AH.

Starbird · « **Reply #2 on:** May 20, 2002, 11:24:41 AM »

Methanol increases the octane rating of gasoline. A higher octane lets you run at higher MP without detonation (the fuel will want to ignite before the piston reaches TDC). It also give you a bit more oxygen to burn.

The water is used to help cool the whole thing down.

Found this dune-buggy site that talks about methanol injection, oddly enough

http://www.dune-buggy.com/turbo/methanol.htm

FDutchmn · « **Reply #3 on:** May 20, 2002, 10:49:18 PM »

so what you guys are telling me is that when methanol runs out, no more WEP?

BUG_EAF322 · « **Reply #4 on:** May 21, 2002, 01:19:25 AM »

The engine runned out before the NOS bottle got empty.
So it was no problem.

Samm · « **Reply #5 on:** May 21, 2002, 01:41:31 AM »

Isn't 140liters of wep an unusually generous amount ?

FDutchmn · « **Reply #6 on:** May 21, 2002, 01:56:20 AM »

Quote

Originally posted by Samm
Isn't 140liters of wep an unusually generous amount ?

well, that's the point, is it a lot or is that consumed in how many minutes...

Naudet · « **Reply #7 on:** May 21, 2002, 02:08:34 AM »

About MW duration:

115 liters in the FW190D9 are good for 40 minutes of MW-WEP.

Now i thing 140 liters would therefor be good for around 60 minutes of MW-WEP. But this might be influenced by MW consumptionrate an MW-mixture. (i.e. Germany birds used MW50, that meant it was half water, half methanol if i remember right) anothe mixture might give a different consumption rate.
Also engine contruction might have some impact. N1K uses an air-cooled radial, while the D9 has a liquid cooled inline. That might change consumption rate also.

Hope that helps.

Samm · « **Reply #8 on:** May 21, 2002, 04:21:29 AM »

Methanol water basically acts as a refrigirant . It cools the fuel air mixture therefore making it denser and increasing the manifold pressure . I think nitrous boost just infuses more oxygen . A wep tank of 140liters is the largest I've ever heard of . Is it a dedicated wep tank or just a fuel tank that was occasionally improvised as a wep tank ?

Someone should do a test to determine if wep endurance of AH planes matches that of the real planes .

Samm · « **Reply #9 on:** May 21, 2002, 04:29:19 AM »

PS.
When I say refigerant I don't mean as in compressed and expanded like freon . I mean becuase of alcohol's evaporation charactaristics . Refigerant is probably the wrong word . Bah !this is what etoh does to me !

Vermillion · « **Reply #10 on:** May 21, 2002, 10:17:34 AM »

Samm the word your looking for is "anti-detonant"

kreighund · « **Reply #11 on:** May 21, 2002, 09:33:38 PM »

The MW tank on the Ki-84 and Ki-100II are nearly the same or larger....I'll have to dig out my books if you need the precise amounts....

What does your book say on 20mm ammo capacity?

FDutchmn · « **Reply #12 on:** May 21, 2002, 11:29:51 PM »

Quote

Originally posted by kreighund
The MW tank on the Ki-84 and Ki-100II are nearly the same or larger....I'll have to dig out my books if you need the precise amounts....

well, not that I need it for a specific purpose, but rather just blabbering away thinking it might be a matter of interest for some people here.

The reason that I posted this was because I think I read some where in this forum that the Homare engine did or did not have a methanol based wep on the N1K2-J. Certainly, the wep as modelled on AirWarrior did not mention methanol at all, so I thought this might be sort of a new discovery for the community as to the N1K2-J.

As for the purposes for Aces High, wep seems endless here. (well, I probably get shot down before I use it all) So, if certain planes or engine requires a consumable like methanol, there will be a limit to its usage. If HTC takes interest in this, it can be modelled, right? And to further suggest, it is like a fuel tank, so we can have a damage model for it was well, so certain hits will kill wep all together, or something like that...

Quote

Originally posted by kreighund
What does your book say on 20mm ammo capacity?

You mean for the N1K2-J? My books are in agreement as modelled on AH right now. 250 rpg for outter guns and 200 rpg for inner guns.

Also, I thought the 30kg weapons, the Mark 3 aerial bombs and the Mark 7 unguided A to A missile were German derived, but it seems from another BBS in Japanese, the Mark 3 Bomb was not from Germany, but developed simulatenously. I am not sure how the development affected each other but it might be fun to know.

My books give one incident for each of these bombs where it was successfully used, but it does say the effiency was very limited to lucky shot... of course...