109 prop pitch (rpm) and the supercharger

[bongodriver]

Originally Posted by JtD

You can skip all the plane manuals and go directly to engine data, if you find plane manuals confusing. Engine limits are engine limits, they don't change.

Are you Crumpp in alias?....you seem to have much the same charm, no need to get patronising.

I don't find aircraft manuals confusing thank you, I just find the idea of a prop turning at 1500 rpm being efficient less than believeable.

[JtD]

Originally Posted by bongodriver

Are you Crumpp in alias?

I find that very insulting. I'm not calling you names just because you don't want to "believe" a simple technical fact.

Originally Posted by bongodriver

I don't find aircraft manuals confusing thank you, I just find the idea of a prop turning at 1500 rpm being efficient less than believeable.

For your consideration: 1500 rpm with a 3.1m diameter prop is 240m/s prop tip speed. Combined with 430km/h cruise you're at 270m/s. If you now consider going supersonic (300ish m/s at altitude) is a bad thing, you might find the figure much more believable. Hope that helps, even if my charm is still lacking.

[bongodriver]

Originally Posted by JtD

I find that very insulting. I'm not calling you names just because you don't want to "believe" a simple technical fact.For your consideration: 1500 rpm with a 3.1m diameter prop is 240m/s prop tip speed. Combined with 430km/h cruise you're at 270m/s. If you now consider going supersonic (300ish m/s at altitude) is a bad thing, you might find the figure much more believable. Hope that helps, even if my charm is still lacking.

I was eqally insulted by your sarcasm, I don't recall putting my query in any form that called your intelligence in to question.

[JtD]

Originally Posted by bongodriver

I was eqally insulted by your sarcasm, I don't recall putting my query in any form that called your intelligence in to question.

I wasn't being sarcastic, the plane manuals did not appear to clarify the things for you. With the benefit of hindsight the if clause wasn't necessary, but not meant as an offence in the first place.

[bongodriver]

Originally Posted by JtD

I wasn't being sarcastic, the plane manuals did not appear to clarify the things for you. With the benefit of hindsight the if clause wasn't necessary, but not meant as an offence in the first place.

Ok, sorry for jumping on you, actually likening you to Crumpp was probably the most insulting thing for which I am most regretfull, I have to admit my mistake was not thinking 10 foot diameter props.....goes to show how your own experience can get you stuck in a rut sometimes, I fly a Stearman with a 7 foot and a bit prop and 1500 rpm is practically idling, the R-670 engine has no reduction drive.