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EA 81 - Douglas Redrive

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  • Very pleasing to hear the static test went well !! Now for the real thing !!BrianPooncarie NSW

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    • I dont know Nick but would reckon if it didnt boil in 5 minutes tied up it would be fine flying. I was surprised when mine went to the red in maybe 2 minutes or less but just figured it was like sitting revving a car with no cooling fan? As i say, no probs when flying. In testing we have to be sure we dont overdo it like doing a bolt up till it strips then backing it off a few turns.Mine is out of a Nissan Pulsar and tucked under the engine at about?? 70 deg I spose to the keel. I have to say I dont like the idea of scalding water sitting above my head, especially when it is not necessary to get efficient cooling. I have a 74 inch warp drive and a rotax box. There is a photo in the "testing forums" under a thread called "test photo".good luck with it allMC

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      • I dont know Nick but would reckon if it didnt boil in 5 minutes tied up it would be fine flying. I was surprised when mine went to the red in maybe 2 minutes or less but just figured it was like sitting revving a car with no cooling fan? As i say, no probs when flying. In testing we have to be sure we dont overdo it like doing a bolt up till it strips then backing it off a few turns.Mine is out of a Nissan Pulsar and tucked under the engine at about?? 70 deg I spose to the keel. I have to say I dont like the idea of scalding water sitting above my head, especially when it is not necessary to get efficient cooling. I have a 74 inch warp drive and a rotax box. There is a photo in the "testing forums" under a thread called "test photo".good luck with it allMC

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        • So nick,The story about the ejection seat has me slightly bemused. Did the nasa man use the same seat in 27 tests or did he crash 27 different aircraft while testing the one ejector seat before it failed to eject?little matter, the ejector seat would only have to work once! My point is that we all need to make sure that we dont get too **** on one particular part of the build.While I am in some kind of stupified awe at your attention to detail, I am, at the same time astonished at your scant regard for advice offered by those with previously accumulated knowedge (see how I artfully avoided using the words "old fellas")15 minutes at full bore and no overheating is exactly what I would be looking for when setting up a pump to lift water the 80 odd feet from the river to my tank, but that pump has more chance of swimming than flying.equally I am looking forward to seeing how your machine will fly. That fan on the back of your gyro isnt there to keep the engine cool (this machine is no air cooled chiller circuit)The prop is there to provide thrust. Why would you restrict the airflow to the prop by jamming a big sqaure thing in front of it?Kindest regards,Horribulus.

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          • So nick,The story about the ejection seat has me slightly bemused. Did the nasa man use the same seat in 27 tests or did he crash 27 different aircraft while testing the one ejector seat before it failed to eject?little matter, the ejector seat would only have to work once! My point is that we all need to make sure that we dont get too **** on one particular part of the build.While I am in some kind of stupified awe at your attention to detail, I am, at the same time astonished at your scant regard for advice offered by those with previously accumulated knowedge (see how I artfully avoided using the words "old fellas")15 minutes at full bore and no overheating is exactly what I would be looking for when setting up a pump to lift water the 80 odd feet from the river to my tank, but that pump has more chance of swimming than flying.equally I am looking forward to seeing how your machine will fly. That fan on the back of your gyro isnt there to keep the engine cool (this machine is no air cooled chiller circuit)The prop is there to provide thrust. Why would you restrict the airflow to the prop by jamming a big sqaure thing in front of it?Kindest regards,Horribulus.

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            • Gentlemen,My apologies for the delay in responding, the motherboard in my other computer is fritzed and I've not had the time to attend to it, swapped back to my old faithfull for a bit.Easter is looking like a good time for a test in flight. I thank you for your words of encouragement and will forward the result when known, you never know, we might all end up with overhead radiators...Mark C - it didn't seem to matter where the old one went, it would not keep up on a static test and trended in the same horrible way as in flight, I'm soundly convinced the old radiator was undersized. Thanks for the link and I'll have a look when I get there.The reason for putting it overhead is that it would not fit well underneath and I am concerned that it would suffer stone damage if so mounted, being alloy I believe it would not have copped a stone very well, and that you would only find out about such a thing when you began to run out of water and your engine began to cook, too bad if you weren't vigilant in monitoring your engine temp - eg, busy mustering. The other reason for mounting it overhead was the heat from the exhaust manifolds would have been caught by the radiator, decreasing its efficiency. I don't like the prospect of a bath in boiling water any more than the next bloke, burns from scalding water are even worse than fire because of the energy trnasfer out of the water and solidity of contact, plus it soaks into clothes. However, I have to ask the q - how does it get on you? I think Tim nominated a roll over, the machine could just as easy end up upside down as right side up, what happens then? I'm going to run with the idea of 'acceptable risk' for the moment.Mr Horribulus,The ejector was, I think, in relation to the Apollo rockets and the lunar landings the yanks did. So he did wreck as I understand it a few mock up modules, very expensive testing. I agree that it would only need to work once. How did you teach your pump to swim? Chinese water torture??Thank you for your stupefaction and awe.. but I would like to know where you get the 'scant regard' from, please enlighten me..I know the fan is for thrust, worked that out... another thing I worked out was that it doesn't matter where you put the radiator, it is still a big square thing in front of the fan... so no matter what you do there will be some sort of a restriction to the air flow to the fan.As to how it flies, I will be treading carefully with same and will do the ususal taxis/hops/circuits and the like to verify the operation and performance of the beast, though I really haven't got the full McCoy from it yet from the refit since doing it, too much tinkering around.regards,Nick.Nicholas TomlinAlarmist - www.alarmist.com.au - we scare for you

              Comment


              • Gentlemen,My apologies for the delay in responding, the motherboard in my other computer is fritzed and I've not had the time to attend to it, swapped back to my old faithfull for a bit.Easter is looking like a good time for a test in flight. I thank you for your words of encouragement and will forward the result when known, you never know, we might all end up with overhead radiators...Mark C - it didn't seem to matter where the old one went, it would not keep up on a static test and trended in the same horrible way as in flight, I'm soundly convinced the old radiator was undersized. Thanks for the link and I'll have a look when I get there.The reason for putting it overhead is that it would not fit well underneath and I am concerned that it would suffer stone damage if so mounted, being alloy I believe it would not have copped a stone very well, and that you would only find out about such a thing when you began to run out of water and your engine began to cook, too bad if you weren't vigilant in monitoring your engine temp - eg, busy mustering. The other reason for mounting it overhead was the heat from the exhaust manifolds would have been caught by the radiator, decreasing its efficiency. I don't like the prospect of a bath in boiling water any more than the next bloke, burns from scalding water are even worse than fire because of the energy trnasfer out of the water and solidity of contact, plus it soaks into clothes. However, I have to ask the q - how does it get on you? I think Tim nominated a roll over, the machine could just as easy end up upside down as right side up, what happens then? I'm going to run with the idea of 'acceptable risk' for the moment.Mr Horribulus,The ejector was, I think, in relation to the Apollo rockets and the lunar landings the yanks did. So he did wreck as I understand it a few mock up modules, very expensive testing. I agree that it would only need to work once. How did you teach your pump to swim? Chinese water torture??Thank you for your stupefaction and awe.. but I would like to know where you get the 'scant regard' from, please enlighten me..I know the fan is for thrust, worked that out... another thing I worked out was that it doesn't matter where you put the radiator, it is still a big square thing in front of the fan... so no matter what you do there will be some sort of a restriction to the air flow to the fan.As to how it flies, I will be treading carefully with same and will do the ususal taxis/hops/circuits and the like to verify the operation and performance of the beast, though I really haven't got the full McCoy from it yet from the refit since doing it, too much tinkering around.regards,Nick.Nicholas TomlinAlarmist - www.alarmist.com.au - we scare for you

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