Turbine performance database
12-15-2006, 09:04 AM
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Turbine performance database
It has been a bit of a surprise to me to learn about the variance between claimed and actual performance of various model turbines. This is post is not intended to be a slam, and I would request that anyone who posts a reply not slam. Full disclosure - I own a P120 with about 85 flights in a Bobcat. It has been a great motor for me, very reliable, and whatever thrust it is producing, the Bobcat/P120 combo is a blast to fly. Having said that:
It would be highly useful if there was a database of consistent, reliable, accurate test info that could be used by us when shopping for a turbine. I am currently unaware of any such database other that the GTBA tests, and those tests appear to have a somewhat limited number of participants. It does appear that other info exists, such as tests by magazines, but the other test info does not appear to exist in one convenient database.
Does such a database exist? If not, could such a database be created? How would the test info be evaluated for accuracy before inclusion (GTBA and magazine tests might be acceptable without verification, but mfg. data could be problematic)? Where would the database be hosted? I doubt that RCU would want it here, but perhaps JPO? GTBA? Privately hosted website?
Again, no slams please, and thanks in advance for info/suggestions.
Regards,
Bob R
It would be highly useful if there was a database of consistent, reliable, accurate test info that could be used by us when shopping for a turbine. I am currently unaware of any such database other that the GTBA tests, and those tests appear to have a somewhat limited number of participants. It does appear that other info exists, such as tests by magazines, but the other test info does not appear to exist in one convenient database.
Does such a database exist? If not, could such a database be created? How would the test info be evaluated for accuracy before inclusion (GTBA and magazine tests might be acceptable without verification, but mfg. data could be problematic)? Where would the database be hosted? I doubt that RCU would want it here, but perhaps JPO? GTBA? Privately hosted website?
Again, no slams please, and thanks in advance for info/suggestions.
Regards,
Bob R
12-15-2006, 09:52 AM
#2
RE: Turbine performance database
ORIGINAL: bobber
It has been a bit of a surprise to me to learn about the variance between claimed and actual performance of various model turbines. This is post is not intended to be a slam, and I would request that anyone who posts a reply not slam. Full disclosure - I own a P120 with about 85 flights in a Bobcat. It has been a great motor for me, very reliable, and whatever thrust it is producing, the Bobcat/P120 combo is a blast to fly. Having said that:
It would be highly useful if there was a database of consistent, reliable, accurate test info that could be used by us when shopping for a turbine. I am currently unaware of any such database other that the GTBA tests, and those tests appear to have a somewhat limited number of participants. It does appear that other info exists, such as tests by magazines, but the other test info does not appear to exist in one convenient database.
Does such a database exist? If not, could such a database be created? How would the test info be evaluated for accuracy before inclusion (GTBA and magazine tests might be acceptable without verification, but mfg. data could be problematic)? Where would the database be hosted? I doubt that RCU would want it here, but perhaps JPO? GTBA? Privately hosted website?
Again, no slams please, and thanks in advance for info/suggestions.
Regards,
Bob R
It has been a bit of a surprise to me to learn about the variance between claimed and actual performance of various model turbines. This is post is not intended to be a slam, and I would request that anyone who posts a reply not slam. Full disclosure - I own a P120 with about 85 flights in a Bobcat. It has been a great motor for me, very reliable, and whatever thrust it is producing, the Bobcat/P120 combo is a blast to fly. Having said that:
It would be highly useful if there was a database of consistent, reliable, accurate test info that could be used by us when shopping for a turbine. I am currently unaware of any such database other that the GTBA tests, and those tests appear to have a somewhat limited number of participants. It does appear that other info exists, such as tests by magazines, but the other test info does not appear to exist in one convenient database.
Does such a database exist? If not, could such a database be created? How would the test info be evaluated for accuracy before inclusion (GTBA and magazine tests might be acceptable without verification, but mfg. data could be problematic)? Where would the database be hosted? I doubt that RCU would want it here, but perhaps JPO? GTBA? Privately hosted website?
Again, no slams please, and thanks in advance for info/suggestions.
Regards,
Bob R
a testbench
and you send him your engine ,so they can run it.
must be a guy who has no connection with any manufacturer.
i for instance just found out that my testbench was showing less thrust then actualy did (gtba stand).
it was a 500 gram difference.
so now we need a honnest guy...
also we need users to send the engines and not manufacturers , they most of the time send very good engines that need a particular user.
no just one from a guy you know.
12-15-2006, 10:18 AM
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RE: Turbine performance database
I believe what we are looking for is a standard throughout the industy. A standard way of specifying the thrust, fuel economy, weight that actualy gets met when an engine leaves any manufacutrers facility.
With the amount of attention latley on manufacturer specs compared to actual values i would hope to see some sort of standard being created.
Any suggestions?
With the amount of attention latley on manufacturer specs compared to actual values i would hope to see some sort of standard being created.
Any suggestions?
12-15-2006, 11:14 AM
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RE: Turbine performance database
easy you just need one honnest guy
Paul.
12-15-2006, 04:09 PM
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RE: Turbine performance database
ORIGINAL: digitech
also we need users to send the engines and not manufacturers , they most of the time send very good engines that need a particular user.
no just one from a guy you know.
also we need users to send the engines and not manufacturers , they most of the time send very good engines that need a particular user.
no just one from a guy you know.
The person have to send his ECU, fuel tank, and filters, battery as all of them would have adverse effect on the outcome of the test.
A clogged fuel filter will not give you the proper reading. And a fuel tank rigged with small ID fuel tubing would also affect outcome of the test
The only problem I see with this is how are you going to protect yourself from liabilities resulting from receiving and running somebody else’s engine. I can see some unscrupulous individual sending you a faulty motor and claiming that it happened after you received and ran it
12-15-2006, 05:30 PM
#7
RE: Turbine performance database
My take on this is that if you brand "X" turbine and it is performing like you want it to, be happy and go flying. Don't get bent out of shape if you bought a fish scale from Dollar General to test the thrust and it is putting out a 1/2 pound of less thrust than what it is supposed to.
There are too many variables here, so go fly, have fun and be safe.
Going to be 81 here tomorrow and guess where I'm going to be and it is not at home fretting if I'm getting the claimed thrust.
There are too many variables here, so go fly, have fun and be safe.
Going to be 81 here tomorrow and guess where I'm going to be and it is not at home fretting if I'm getting the claimed thrust.
12-15-2006, 07:43 PM
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RE: Turbine performance database
FWIW, I was not suggesting in the original post that Consumer Reports style testing be undertaken. Big can of worms for many reasons. Moderators, please close or delete this thread so as to save bandwidth. Thanks.
12-16-2006, 12:32 AM
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RE: Turbine performance database
ORIGINAL: bobber
FWIW, I was not suggesting in the original post that Consumer Reports style testing be undertaken. Big can of worms for many reasons. Moderators, please close or delete this thread so as to save bandwidth. Thanks.
FWIW, I was not suggesting in the original post that Consumer Reports style testing be undertaken. Big can of worms for many reasons. Moderators, please close or delete this thread so as to save bandwidth. Thanks.
Done
