[camber]

Gentlemen!

So many of these arguments seem to based on interpreting an slightly ambiguous statement to make it wrong.

Originally Posted by JtD

As an example of WW2 climb tests, look at table I in this Spitfire IX test, you can see a constant IAS up to FTH and a constant TAS above FTH. Il-2 compare will always give you constant TAS, which will give you the somewhat higher climb performance below FTH, about 100 fpm in this case. Less than 5% obviously, and all I wanted to say.

Well this is pretty clear and supported by the reference. the Spittie pilots doing that test climbed at constant IAS mostly and recorded climb rate.

Originally Posted by Crumpp

Climb speed will never be constant with altitude. Any pilot or first year aeronautical science students knows this....

Obviously the pilot can choose to climb at constant IAS if aircraft capability permits. I take it, this statement should be:

Vx (IAS for best climb angle) and Vy (IAS for best rate of climb) will never be constant with altitude."

This is true enough but I know a flight instructor that had it a bit confused . So climb tests at constant IAS (such as that Spittie one) may not be capturing optimum rate of climb at each altitude? Interesting.

Originally Posted by JtD

Yes, and in second year they learn that there always are exceptions to the rule, and thus it's "hardly ever" and not "never". An example for an exception has already been given in this topic, so feel free to educate yourself.

There seems no real disagreement at this point, just an imaginary one

Originally Posted by Crumpp

Baloney. To achieve Vx or Vy, velocity must change with altitude. There are no exceptions to that no matter how much you tap dance.

A clearer statement now it is expanded from just "climb speed".

It is quite hard to write unambiguously in technical detail, and anyone's forum posts are likely to fall down on this now and again regardless of their aviation knowledge. But instead of jumping on it as evidence of moron, why not have a lovely big glass of wine? Of course that is what I am doing AND writing this post, so maybe you can do both if you really want to

2007 Reisling, camber