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Search: Posts Made By: barit1
Showing results 1 to 16 of 16
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Forum: Tech Log
3rd Mar 2012, 01:55
Replies: 155
Views: 42,082
Posted By barit1

Quite OK, thermostat, I've managed to learn a...

Quite OK, thermostat, I've managed to learn a thing or two after 70 years around planes and engines, and if I'm able to pass some of it along, I'm flattered.

But my original point was that when...
Forum: Tech Log
29th Feb 2012, 01:37
Replies: 155
Views: 42,082
Posted By barit1

thermostat: Recip or turbine, more air...

thermostat:

Recip or turbine, more air requires more fuel. The exact ratio will vary slightly (but ONLY slightly) as component efficiencies migrate, but if you've found a way to boost airflow...
Forum: Tech Log
14th Feb 2012, 21:58
Replies: 155
Views: 42,082
Posted By barit1

No doubt you climb faster, but since TAS & GS are...

No doubt you climb faster, but since TAS & GS are greater, your rate of turn (assuming same bank angle) is less, time & distance traveled is greater, and total trip distance is greater.

So the...
Forum: Tech Log
8th Jan 2012, 01:37
Replies: 155
Views: 42,082
Posted By barit1

The temperature rise in the burner expands the...

The temperature rise in the burner expands the gas - thus its velocity increases smartly. But it's still subsonic flow, in an environment where the velocity of M1.0 is greatly increased compared to...
Forum: Tech Log
7th Jan 2012, 12:13
Replies: 155
Views: 42,082
Posted By barit1

Well, not really. The combustor does not create...

Well, not really. The combustor does not create pressure, unlike a piston engine. In fact there's a small pressure drop as air flows through the burner. The main restriction to flow is the turbine...
Forum: Tech Log
19th Dec 2011, 20:00
Replies: 155
Views: 42,082
Posted By barit1

TTex600: Sorry, I had missed your point. You...

TTex600:

Sorry, I had missed your point. You are of course correct.

But I was addressing the common misconception of the escaping exhaust of a jet or rocket "reacting" against the atmosphere...
Forum: Tech Log
19th Dec 2011, 19:51
Replies: 155
Views: 42,082
Posted By barit1

Exactly, and the oxidizer pump performs exactly...

Exactly, and the oxidizer pump performs exactly the same function as a gas turbine's compressor. Without pressure in the rocket's chamber, there is no thrust. And without a fuel pump supplying a like...
Forum: Tech Log
30th Nov 2011, 23:40
Replies: 155
Views: 42,082
Posted By barit1

Does anyone remember the pulsejet...

Does anyone remember the pulsejet (http://en.wikipedia.org/wiki/Pulse_jet_engine) engine? The German V-1 used it.
Forum: Tech Log
30th Nov 2011, 23:34
Replies: 155
Views: 42,082
Posted By barit1

TTex600: Absolutely NOT true, and the...

TTex600:

Absolutely NOT true, and the obvious example is a rocket engine in a vacuum. The thrust is the result of the mass flow of gas and its exit velocity, and does not require "something to...
Forum: Tech Log
29th Nov 2011, 18:08
Replies: 155
Views: 42,082
Posted By barit1

This effect can be achieved by valving, gradually...

This effect can be achieved by valving, gradually opening a bypass duct while closing down airflow to the gas turbine. Several schemes have been tested, going back to P&W's entry in the SST race of...
Forum: Tech Log
29th Nov 2011, 18:02
Replies: 155
Views: 42,082
Posted By barit1

Well, almost. The ramjet needs a high-pressure...

Well, almost. The ramjet needs a high-pressure fuel pump, and it's generally driven by an air turbine, by tapping some inlet air from the diffuser.
Forum: Tech Log
25th Nov 2011, 12:55
Replies: 155
Views: 42,082
Posted By barit1

TURIN: Well, a prop blade is an airfoil, and...

TURIN:

Well, a prop blade is an airfoil, and Bernoulli tells us all about that. Static pressure is increased on the aft face of the blade. This may have little or no effect on the ENGINE cycle,...
Forum: Tech Log
22nd Nov 2011, 12:51
Replies: 155
Views: 42,082
Posted By barit1

Methinks you are all missing the point. Suppose I...

Methinks you are all missing the point. Suppose I build an aircraft that is electrically powered (motor driving a prop), or hydraulically powered, or compressed air, or human powered. In all cases...
Forum: Tech Log
22nd Nov 2011, 03:20
Replies: 155
Views: 42,082
Posted By barit1

Any aircraft engine supplies a propulsive force...

Any aircraft engine supplies a propulsive force by capturing a mass of air and then accelerating that air. It may be a propeller doing the job, or it may be a gas turbine (we call it a jet engine)....
Forum: Tech Log
20th Nov 2011, 21:52
Replies: 155
Views: 42,082
Posted By barit1

oggers: Well, this may or may not be true...

oggers:

Well, this may or may not be true for a given engine type, depending on the characteristics of the control system (whether governing to a constant core speed, constant corrected speed,...
Forum: Tech Log
11th Nov 2011, 12:35
Replies: 155
Views: 42,082
Posted By barit1

One might approach this from the ramjet end of...

One might approach this from the ramjet end of the spectrum. What makes a ramjet work, and why won't it create thrust while standing still? Once you internalize this problem, you begin to understand...
Showing results 1 to 16 of 16


 
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