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Search: Posts Made By: bookworm
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Forum: Tech Log
12th Dec 2003, 22:48
Replies: 57
Views: 10,426
Posted By bookworm

That the "engine output" is not fixed. If the...

That the "engine output" is not fixed. If the thrust is constant, then just as the power required (drag * TAS) increases with density altitude at constant CAS, so does the power available (thrust *...
Forum: Tech Log
12th Dec 2003, 18:19
Replies: 57
Views: 10,426
Posted By bookworm

I think that's a rather more general definition...

I think that's a rather more general definition than Hawk37 intended when he wrote:



He was suggesting that the thrust produced was independent of temperature over the range of interest. That...
Forum: Tech Log
12th Dec 2003, 05:29
Replies: 57
Views: 10,426
Posted By bookworm

So, what does flat rated mean then?

So, what does flat rated mean then?
Forum: Tech Log
6th Dec 2003, 18:59
Replies: 57
Views: 10,426
Posted By bookworm

Looks like we agree on the equations, Keith. ...

Looks like we agree on the equations, Keith. We'll just have to agree to differ as to how we describe those in words.
Forum: Tech Log
6th Dec 2003, 15:50
Replies: 57
Views: 10,426
Posted By bookworm

Keith I think this TAS cubed thing is just a...

Keith

I think this TAS cubed thing is just a lack of clarity about what we're holding constant and what we're considering as a variable. We're probably saying the same thing in different ways.
...
Forum: Tech Log
5th Dec 2003, 23:38
Replies: 57
Views: 10,426
Posted By bookworm

But the climb rate wouldn't be unchanged if the...

But the climb rate wouldn't be unchanged if the excess thrust is unchanged. It would be increased. The rate of climb depends on excess power, which is excess thrust times TAS. With TAS as a factor...
Forum: Tech Log
5th Dec 2003, 14:49
Replies: 57
Views: 10,426
Posted By bookworm

One point I don't follow Keith: Surely...

One point I don't follow Keith:



Surely the drag depends on the dynamic pressure and therefore the CAS squared?
Forum: Tech Log
5th Dec 2003, 02:38
Replies: 57
Views: 10,426
Posted By bookworm

Post The figures Baron and HotDog quote demonstrate...

The figures Baron and HotDog quote demonstrate that the engine is not capable of supplying that flat-rated thrust (static or otherwise) over the entire temperature and altitude range.

What would...
Forum: Tech Log
4th Dec 2003, 02:35
Replies: 57
Views: 10,426
Posted By bookworm

Post Nice explanation Keith, thank you. I...

Nice explanation Keith, thank you.



I guess there's a continuum from almost-constant-thrust turbojet through low-bypass turbofans, high-bypass turbofans to almost-constant-power turboprops.
Forum: Tech Log
3rd Dec 2003, 23:40
Replies: 57
Views: 10,426
Posted By bookworm

Nope, fell at the last unfortunately! Excess...

Nope, fell at the last unfortunately! Excess thrust at higher speed generates more power, and therefore a higher rate of climb -- just enough, in fact, to compensate for the extra distance travelled...
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