just some questions
09-26-2007 | 04:18 PM
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From: Marrietta,
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just some questions
Ok I had some simple questions to some of you jet guys. I’m not taking any plunge. I haven’t even soloed yet to tell the truth. I just have wanted some answers.
But what is the ratio between a model jet and a full size jet? I don’t know any model numbers of real jet engines so just pick one.
I know some knowledge on real jet engines but what are huge differences in model jet engines and real ones? I do know some but correct me if wrong; model engines don’t have afterburners, they don’t have an adjustable aghast cone, and don’t have as many compressors or turbines.
Another question is; what is the average cost of some model jets, and what makes them so expensive?
What controls the speed on model jet engines?
Why do you need such big receivers?
That is about all for now. Any help will be appreciated
But what is the ratio between a model jet and a full size jet? I don’t know any model numbers of real jet engines so just pick one.
I know some knowledge on real jet engines but what are huge differences in model jet engines and real ones? I do know some but correct me if wrong; model engines don’t have afterburners, they don’t have an adjustable aghast cone, and don’t have as many compressors or turbines.
Another question is; what is the average cost of some model jets, and what makes them so expensive?
What controls the speed on model jet engines?
Why do you need such big receivers?
That is about all for now. Any help will be appreciated
09-26-2007 | 04:27 PM
#2
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RE: just some questions
MY ANSWERS WILL BE IN CAPS NEXT TO YOUR QUESTIONS
ORIGINAL: seemefly_1
Ok I had some simple questions to some of you jet guys. I’m not taking any plunge. I haven’t even soloed yet to tell the truth. I just have wanted some answers.
But what is the ratio between a model jet and a full size jet? I don’t know any model numbers of real jet engines so just pick one. AVERAGE IS 1/7 SCALE
I know some knowledge on real jet engines but what are huge differences in model jet engines and real ones?NOT A WHOLE LOT OF DIFFERENCE, THE CONCEPT IS THE SAME, SUCK, SQUEEZE, BANG, BLOW I do know some but correct me if wrong; model engines don’t have afterburners, they don’t have an adjustable aghast cone, and don’t have as many compressors or turbines. MOSTLY CORRECT. ONE COMPRESSOR WHEEL, ONE TURBINE WHEEL. THESE ARE SINGLE STAGE VANE AXIAL GAS TURBINES.
Another question is; what is the average cost of some model jets, and what makes them so expensive? THE KIT OR ARF ITSELF IS NOT NECCESSARILY MORE EXPENSIVE. THE LANDING GEAR TENDS TO BE MORE BECAUSE ITS NOT A MOLDED ONE PIECE OF FIBERGLASS WITH 50 CENT AXLES AND FOAM WHEELS. SEE ROBART.COM
What controls the speed on model jet engines? THERE IS A PUMP THAT PUMPS FUEL BASED ON WHERE YOU SET THE THROTTLE. MORE FUEL OR LESS IN THE COMBUSTION CHAMBER OF THE ENGINE MEANS FASTER SPINNING OR SLOWER.
Why do you need such big receivers? DEFINE "BIG" RECEIVER. A REGULAR 20 DOLLAR RECEIVER WILL FLY A JET, BUT WILL NOT MEET THE REGULATIONS. BETTER EQUIPMENT COSTS MORE MONEY (NORMALLY).
That is about all for now. Any help will be appreciated
Ok I had some simple questions to some of you jet guys. I’m not taking any plunge. I haven’t even soloed yet to tell the truth. I just have wanted some answers.
But what is the ratio between a model jet and a full size jet? I don’t know any model numbers of real jet engines so just pick one. AVERAGE IS 1/7 SCALE
I know some knowledge on real jet engines but what are huge differences in model jet engines and real ones?NOT A WHOLE LOT OF DIFFERENCE, THE CONCEPT IS THE SAME, SUCK, SQUEEZE, BANG, BLOW I do know some but correct me if wrong; model engines don’t have afterburners, they don’t have an adjustable aghast cone, and don’t have as many compressors or turbines. MOSTLY CORRECT. ONE COMPRESSOR WHEEL, ONE TURBINE WHEEL. THESE ARE SINGLE STAGE VANE AXIAL GAS TURBINES.
Another question is; what is the average cost of some model jets, and what makes them so expensive? THE KIT OR ARF ITSELF IS NOT NECCESSARILY MORE EXPENSIVE. THE LANDING GEAR TENDS TO BE MORE BECAUSE ITS NOT A MOLDED ONE PIECE OF FIBERGLASS WITH 50 CENT AXLES AND FOAM WHEELS. SEE ROBART.COM
What controls the speed on model jet engines? THERE IS A PUMP THAT PUMPS FUEL BASED ON WHERE YOU SET THE THROTTLE. MORE FUEL OR LESS IN THE COMBUSTION CHAMBER OF THE ENGINE MEANS FASTER SPINNING OR SLOWER.
Why do you need such big receivers? DEFINE "BIG" RECEIVER. A REGULAR 20 DOLLAR RECEIVER WILL FLY A JET, BUT WILL NOT MEET THE REGULATIONS. BETTER EQUIPMENT COSTS MORE MONEY (NORMALLY).
That is about all for now. Any help will be appreciated
09-26-2007 | 04:37 PM
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From: Marrietta,
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RE: just some questions
THESE ARE SINGLE STAGE VANE AXIAL GAS TURBINES.
DEFINE "BIG" RECEIVER
09-26-2007 | 05:11 PM
#4
RE: just some questions
Quote:
I know some knowledge on real jet engines but what are huge differences in model jet engines and real ones? I do know some but correct me if wrong; model engines don’t have afterburners, they don’t have an adjustable aghast cone, and don’t have as many compressors or turbines.
Response:
The principles are the same for model or full size jet engines, the model engines are just simpler designs for ease of construction and cost reduction. There is one model engine that I know of that has an afterburner it’s called the Skypipe and made in Germany, there are no adjustable exhaust cones at this time, they would require a much more complicated design to handle the internal pressure changes in the engine without causing flameouts or compressor stalls. All currently available jet engines use single stage centrifugal flow compressors with one turbine wheel. The prices of these engines are high because of the tight tolerances and material required to withstand the high temps and RPM that they operate at. Hope that answers your questions.
I know some knowledge on real jet engines but what are huge differences in model jet engines and real ones? I do know some but correct me if wrong; model engines don’t have afterburners, they don’t have an adjustable aghast cone, and don’t have as many compressors or turbines.
Response:
The principles are the same for model or full size jet engines, the model engines are just simpler designs for ease of construction and cost reduction. There is one model engine that I know of that has an afterburner it’s called the Skypipe and made in Germany, there are no adjustable exhaust cones at this time, they would require a much more complicated design to handle the internal pressure changes in the engine without causing flameouts or compressor stalls. All currently available jet engines use single stage centrifugal flow compressors with one turbine wheel. The prices of these engines are high because of the tight tolerances and material required to withstand the high temps and RPM that they operate at. Hope that answers your questions.
