I'm pretty sure this was suggested before, but in light of some recent posts by HTC on how they will work on perked ordnance/weapon options I thought it may be worthwhile to bring this up again.
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We've had almost countless arguments involving which plane used which grade of fuel, which engine boost setting, and which of those settings in game are acceptable for "balance" or not.
For example, on the earlier 109s such as the 109F-4, the 1.42 ata boost rating wasn't cleared until much later. Now, when HTC modelled the Friederich, I'm pretty sure the intention was to add in a represantative Bf109 variant of 1941, but for some reason they've graciously modelled it upto post-'41 standards using 1.42 ata. However, in contrast, our SpitV has reverted once more to 1941 standards, and the +16 boost setting was dropped.
As an avid Luftwaffle fanboy who hates Spitfires

and who thinks there can never be too much advantage in performance when it comes to fighting those mega-HO Hizooka planes

, seeing the 109F-4 or G-2 "derated" to 1.30 ata as per its initial setting before clearance would probably make me cry. However, that does not mean I'm an unfair person, and if the SpitV in the game is under 1941 standards as per its original introduction, then there's no reason why the 109s shouldn't be using the same standards.
Then, perhaps a more interesting solution can be suggested. Why not model all planes to its initial/represantative flight condition, and then give the pilots an option to use higher boost/fuel setting by paying a certain amount of perks? In the above case, the Bf109F-4 or G-2, would then probably be "derated", (or "limited", rather) to 1.30ata as it should be. And then, in the hangars, there would be an option concerning the grade of fuel/engine setting, in which the pilot can pay the set price. In this case, the pilot would be able to select a "1.42ata" option at perhaps.. let's say 2 or 3 perks?
This basic concept could probably be applied all sorts of planes.
* The Bf109K-4 would be using 1.80 ata as AH default, as this would be more closer to the "initial performance". The 1.98 ata would be perked slightly.
* The Typhoon we have, should be using original 1941 Typhoon standards as default.. the higher boost ratings (the 1944 Typhoons we have) will also be perked slightly.
* The various Spitfires, P-47s, P-51s, P-38s.. and etc etc.. would be 100 octane as standard. However, the perked options will make the 150 octane be available. In this case the significant increase in performance due to better grade fuel would have much higher impact in the MA than others.. so their perk prices would be somewhat heavier.. perhaps 10~15 perks. (Looking at the figures, seems like 150 octane, even if it was common for the USAAF or RAF after 1944, would make our AH planes even more monsterous than what we have now!)
... and etc etc.. for almost every plane we have.
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While this would probably be a very tedious and time-consuming process for HTC, it still has some very positive aspects for the overall gameplay IMO.
1) Any arguments or accusations concerning impartiallity in modelling standards will stop. All the planes will use their "standard", or "introductory" boost/fuel settings as a rule. And then, they will be given the option to use historical, higher boost/fuel options by paying perks. Ofcourse the perks will vary according to their impact/balance in the MA.
2) It would greatly benefit any historical Events, Tours, Scenarios...since the historical representation of each planes according to a timeline would be easier to manage. When we are playing 1941 Scenarios, nobody would be complaing about a "uber", '44 standard Typhoon out performing every plane. Likewise, early "Battle of the Channel" fights won't have to pit '41 Spit5s against '42 Bf109F-4s.
3) It would get rid of any future troubles when HTC decides to introduce a plane that had a same airframe, but differing performances according to timeline due to different grade of fuel/engine setting. There would be no difficulties in deciding on what standard would have to be used. Just model the 'initial' or 'standard' setting, and then add in a perked option.
4) It would give players a new way of spending perks at.
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If there is any chance that introducing the higher grade fuel/engine setting would become problematic in that the more 'elite' grade of AH pilots will make exclusive usage of it, then the perks prices could easily factor in some "penalties", like having a substantially higher K/D than the average pilot would result in increase of the perk cost for such options.. or etc etc ideas.
If we're going to see perked ordnance/weapons, might as well see perked fuel grade/engine settings too.. Wouldn't that be great?