Upper end throttle saturation with TM Warthog

[Motorpool]

I was putting in a lot of 'Bolt/Double Wasp seat time in anticipation of flying the Corsair.  I always had an issue with my Warthog throttle causing 'runaway' manifold pressure into the 60s at the upper end of the unit's physical travel.  I never wanted to 'saturate out' the upper end of the axis mapping in the event I'd need it in ultra high altitude situations, etc. and never got around to testing that.

Have any of you experienced something similar? 

[Art-J]

With single-speed supercharging coupled with turbocharging It's a very different forced induction setup compared to Corsair's one, so I'd say flying Tbolt won't really prepare you for the latter (not to mention the whole engine modelling still being WIP over there).

Moreover, our Tbolt doesn't feature MAP regulator so "runaway" MAP at low altitudes is always going to be a thing because of either turbo kicking in (when linking throttle lever with boost one), or simply performing dives and getting extra ram-air boost on top of what levers suggest.

That being said, you "run out of" physical throttle movement at medium alts already, so I wouldn't bother with fiddling with throttle axis saturation to be honest.

[PawlaczGMD]

10 hours ago, Motorpool said:

I was putting in a lot of 'Bolt/Double Wasp seat time in anticipation of flying the Corsair.  I always had an issue with my Warthog throttle causing 'runaway' manifold pressure into the 60s at the upper end of the unit's physical travel.  I never wanted to 'saturate out' the upper end of the axis mapping in the event I'd need it in ultra high altitude situations, etc. and never got around to testing that.

Have any of you experienced something similar? 

The turbo can have a VERY delayed response in some situations. I know what you mean. I don't think it's a hardware issue, that's how the turbo behaves. I would not mess with the throttle axis. When the turbo speed is low, I advance the throttle slowly and anticipate a fast spike. Not sure if this is correct or what the technical reason is, but that's what it does sometimes. 

[grafspee]

12 hours ago, PawlaczGMD said:

The turbo can have a VERY delayed response in some situations. I know what you mean. I don't think it's a hardware issue, that's how the turbo behaves. I would not mess with the throttle axis. When the turbo speed is low, I advance the throttle slowly and anticipate a fast spike. Not sure if this is correct or what the technical reason is, but that's what it does sometimes. 

Turbocharger is driven by exhaust gases. So when turbo reaches working rpm, compressor starts to elevate boost, elevated boost creates more exhaust gases which makes turbo spin faster then compressor provide  even more boost and so on so on. There is a chain reaction which simply leads to engine blowup if not controlled properly.  In P-47 there is a system which controls turbo but it is very basic and only thing which that system does is, that it will prevent engine from blowing up instantly, keeping proper boost is up to pilot.

Supercharger setups are much more stable in that regard, system controls how much air goes to supercharger and that's it. Sudden boost increase does not affect supercharger speed and does not affect supercharger output.

[Motorpool]

Thanks all.  Very helpful, and nothing to do other than be more mindful on the throttle advance especially at low altitude.

The multistage blower in the F4U is definitely less prone to helmet fires, but I always thought the turbo in the trunk of the P-47 was pretty ingenious.