David Williams
New member
What are the altitude limitation >5000 meter of the PTE-450A2 micro turbojet engine?
Max rpm 82,000.
Fuel Jet A 1.
Max rpm 82,000.
Fuel Jet A 1.
Help! What are the altitude limitation >5000 meter of the PTE-450A2 micro turbojet engine?
- Thread starter David Williams
- Start date
500 feet is the minimum altitude for manned aircraft. The max for unmanned aircraft is 400 feet in most places. Some AMA fields have the limitations raised to 700 or 1000 ft depending on the airspace they occupy. The field I fly has a 700 foot limit.
Houndpup Rc
Legendary member
Piotrsko
Legendary member
Go to the local GA airport, buy or borrow yourself a "sectional" map (maybe $10 usd new and current. Free if obsolete). Iirc, everything blue edged is legal to fly in below 401 ft agl OR above. It will tell you your maximum allowed altitude above ground. Be advised you can have full sized aircraft operating below 500 ft with waivers. Pipeline survey and crop dusting come to mind, maybe traffic control with a chopper or fixed wing, rescue and firefighting aircraft. Stories abound of firefighting/ cropduster stuff comming back with tree branches stuck on the plane somewhere.
It appears the OP is asking for info about a micro turbo jet.
I think he's wanting to know what the altitude limitations are for engine operation.
I have no personal experience here, but searches tell me other similar engines have a rough altitude limit of approx. 10,000 meters.
Note: It is a relatively unusual post. Use caution.
I think he's wanting to know what the altitude limitations are for engine operation.
I have no personal experience here, but searches tell me other similar engines have a rough altitude limit of approx. 10,000 meters.
Note: It is a relatively unusual post. Use caution.
Houndpup Rc
Legendary member
Mr Man
Mr SPEED!
I must;be been thinking of my club 🤣
Piotrsko
Legendary member
Agl or density altitude on a standard day? Not like you can see it up there
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I'm fairly confidant it's not going to be operated line of sight at 3+ miles up.
He did say it is going in a Human vehicle in another thread....
That is the one I linked....
David Williams
New member
On Sunny day, I fly near touching 16,400 feet (5000 m) but I observed engine flame out, All sensors found In good condition, on third attempt Engine restart . Life saved.
On discussion with expert, following main points result out why engine flame out at such high altitude.
Either violation with following points
1.Low density air.
2.Engine can flame out without any sensor warning ⚠️.
3.Automatic relight often fail due to low density of air.
4.ECU altitude compensation Map vs Ambient Pressure/Low Density of Air.
As engine fuel tank not pressurized .
Flight envelope here.
What are forum friends openion?
On discussion with expert, following main points result out why engine flame out at such high altitude.
Either violation with following points
1.Low density air.
2.Engine can flame out without any sensor warning ⚠️.
3.Automatic relight often fail due to low density of air.
4.ECU altitude compensation Map vs Ambient Pressure/Low Density of Air.
As engine fuel tank not pressurized .
Flight envelope here.
What are forum friends openion?
Piotrsko
Legendary member
Too rich fuel mixture ratio at altitude such that there is too much fuel for ignition Or not an efficient enough spray pattern to ignite. Believe the spray pattern changes to not dispersal shape which may miss the igniter. You can also extinguish a fire with fuel (mostly by cooling) in space, but that is inefficient and only applicable where there is no sufficient oxidizer available in the environment. Traditional engines run until they cannot make a critical horespower to continue acceleration rotation. It will run, but not make adequate thrust to burn available mixture. Egt will indicat near ambient tempratures instead of typical
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quorneng
Master member
All turbines even full size have an altitude limit where the lack of oxygen reduces the thrust to the minimum the plane needs to fly although it is usually higher than the relight altitude.
This was exactly what Gary Powers in the U2 suffered over the Soviet Union. Flying at 65,000 feet and power limited to flying just a few knots above the stall speed he suffered a flame out. To stand a chance of a relight he had to descend to below 60,000 feet where due to the reduced altitude he came within range of a SAM missile.
Each design of model turbine as they have a less efficient compressor then full size will have a specific and much lower relight altitude limit.
This was exactly what Gary Powers in the U2 suffered over the Soviet Union. Flying at 65,000 feet and power limited to flying just a few knots above the stall speed he suffered a flame out. To stand a chance of a relight he had to descend to below 60,000 feet where due to the reduced altitude he came within range of a SAM missile.
Each design of model turbine as they have a less efficient compressor then full size will have a specific and much lower relight altitude limit.
