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#21
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Hm,I just started using gliderpilot.net instead of google
to view RAS.Looks like it strips all line breaks and decided to post my message more than once.-Tom Tom Serkowski ASH-26E To email me, place '@' after Tom, and append '.com' |
#22
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No speculation.
After such a long flight, having been cooled by the high altitude the chances that the battery would be able to crank the pylon up is remote. (It should be at full nominal charge as it is charged in flight by a generator) If it did extend, the chances that there would be enough power available spin a two stroke engine at well below freezing point, fast enough to start is even more remote. Then you have fuel that may have gelled at low temperature, and the probability of carburettor icing. I don't think there is much speculation. The chances of starting your engine under these circumstances must be almost zero. Bruce Alan Irving wrote: Speculation on whose part? I'm merely reporting what Ohlmann himself said. Perhaps he was speculating that the engine wouldn't start after spending 15 hours at sub zero temperatures - do you actually think it would? Seeing how meticulous he was in all other facets of his preparation, I imagine he might have tried the motor during a local flight to confirm that it wouldn't start. But that's just speculation... At 15:12 28 June 2004, Andrew Henderson wrote: That's speculation, and the record whilst a magnificent flight is not the same as one without an engine. Are you saying that in all of Klaus's previous practise flights at these heights he never started the engine to get home because the flight 'wasn't on'? I think not. Andy Henderson At 14:18 28 June 2004, Alan Irving wrote: When Klaus Ohlmann talked about his Argentinian record flights at the BGA conference a few years back, I believe he said that having spent all day at 20,000+ feet the engine in the Stemme would be highly unlikely to start. Hence there is no more 'opt out' than if the flight had been done in a pure sailplane, and the aachievement is no less valid. |
#23
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To play devils advocate for a moment .....
No one is going to start the engine at 20000' and minus 25 degrees C. Its started at 2000' agl and in Argentina the temperature may be 30 degrees or more at that altitude. I'll give you that it might take a while for the engine to warm up to that temperature but would a pilot fly all the way down without starting to employ energy/height saving measures Generally two stroke engines don't have crankcases full of oil, lubrication being acheived by the fuel oil mixture. If it's a turbo it doesn't need cranking, it windmill starts and the ignition is magneto's - no battery needed. The Stemme uses a 4 stroke powerplant I think. Ian "Bruce Greeff" wrote in message ... No speculation. After such a long flight, having been cooled by the high altitude the chances that the battery would be able to crank the pylon up is remote. (It should be at full nominal charge as it is charged in flight by a generator) If it did extend, the chances that there would be enough power available spin a two stroke engine at well below freezing point, fast enough to start is even more remote. Then you have fuel that may have gelled at low temperature, and the probability of carburettor icing. I don't think there is much speculation. The chances of starting your engine under these circumstances must be almost zero. Bruce Alan Irving wrote: Speculation on whose part? I'm merely reporting what Ohlmann himself said. Perhaps he was speculating that the engine wouldn't start after spending 15 hours at sub zero temperatures - do you actually think it would? Seeing how meticulous he was in all other facets of his preparation, I imagine he might have tried the motor during a local flight to confirm that it wouldn't start. But that's just speculation... At 15:12 28 June 2004, Andrew Henderson wrote: That's speculation, and the record whilst a magnificent flight is not the same as one without an engine. Are you saying that in all of Klaus's previous practise flights at these heights he never started the engine to get home because the flight 'wasn't on'? I think not. Andy Henderson At 14:18 28 June 2004, Alan Irving wrote: When Klaus Ohlmann talked about his Argentinian record flights at the BGA conference a few years back, I believe he said that having spent all day at 20,000+ feet the engine in the Stemme would be highly unlikely to start. Hence there is no more 'opt out' than if the flight had been done in a pure sailplane, and the aachievement is no less valid. |
#24
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tango4 wrote:
To play devils advocate for a moment ..... No one is going to start the engine at 20000' and minus 25 degrees C. Its started at 2000' agl and in Argentina the temperature may be 30 degrees or more at that altitude. I'll give you that it might take a while for the engine to warm up to that temperature but would a pilot fly all the way down without starting to employ energy/height saving measures Generally two stroke engines don't have crankcases full of oil, lubrication being acheived by the fuel oil mixture. If it's a turbo it doesn't need cranking, it windmill starts and the ignition is magneto's - no battery needed. The Stemme uses a 4 stroke powerplant I think. Ian "Bruce Greeff" wrote in message ... No speculation. After such a long flight, having been cooled by the high altitude the chances that the battery would be able to crank the pylon up is remote. (It should be at full nominal charge as it is charged in flight by a generator) If it did extend, the chances that there would be enough power available spin a two stroke engine at well below freezing point, fast enough to start is even more remote. Then you have fuel that may have gelled at low temperature, and the probability of carburettor icing. I don't think there is much speculation. The chances of starting your engine under these circumstances must be almost zero. Bruce Alan Irving wrote: Speculation on whose part? I'm merely reporting what Ohlmann himself said. Perhaps he was speculating that the engine wouldn't start after spending 15 hours at sub zero temperatures - do you actually think it would? Seeing how meticulous he was in all other facets of his preparation, I imagine he might have tried the motor during a local flight to confirm that it wouldn't start. But that's just speculation... At 15:12 28 June 2004, Andrew Henderson wrote: That's speculation, and the record whilst a magnificent flight is not the same as one without an engine. Are you saying that in all of Klaus's previous practise flights at these heights he never started the engine to get home because the flight 'wasn't on'? I think not. Andy Henderson At 14:18 28 June 2004, Alan Irving wrote: When Klaus Ohlmann talked about his Argentinian record flights at the BGA conference a few years back, I believe he said that having spent all day at 20,000+ feet the engine in the Stemme would be highly unlikely to start. Hence there is no more 'opt out' than if the flight had been done in a pure sailplane, and the aachievement is no less valid. Hi Ian Comment based on information provided by Stemmme among others, where they commented that they had to leave the engine overnight to warm up before it was warm enough to start without fear of damage. This on some of the record flights they were involved in. Similarly any oil has a temperature range in which it works as specified. After a good long cold soak, I doubt the short descent to 2000 AGL will significantly warm the engine or the fuel/oil mix. Not only because of time, but because much of the ground in the Andes is well over 10,000 MSL, so you are unlikely to be getting the balmy plains temperatures when you are in trouble in the mountains. Look at some of the videos, they show snow as far as the eye can see, in most directions for much of the flight. The Solo used in the Nimbus is not a turbo, so needs battery power to start. The first obstacle is probably enough to make the starting issue moot. Very cold batteries simply do not deliver much power. I doubt you could get the jackscrew to crank the pylon up... |
#25
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Incidentally, am I right in thinking that a Bocian held one of the world women's two-seater records before they were abolished? Free distance, perhaps? Ian What!! Women have been abolished??? -- Mike Lindsay |
#26
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Hm,I just started using gliderpilot.net instead of google
to view RAS.Looks like it strips all line breaks and decided to post my message more than once.-Tom Tom Serkowski ASH-26E To email me, place '@' after Tom, and append '.com' |
#27
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tango4 wrote:
If it's a turbo it doesn't need cranking, it windmill starts and the ignition is magneto's - no battery needed. I'd be interested in the windmill start procedure for a Stemme. ....and with NO battery? Graeme Cant |
#28
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#29
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On Thu, 01 Jul 2004 21:29:23 +1000, Graeme Cant
wrote: tango4 wrote: If it's a turbo it doesn't need cranking, it windmill starts and the ignition is magneto's - no battery needed. I'd be interested in the windmill start procedure for a Stemme. ...and with NO battery? Don't forget all the bits that slide and open, like the nose cone and vents, before you can start a Stemme. Cold-soak all that grease for a few hours and then I bet you'd struggle to expose the prop and open the air intakes, let alone get a start. Just a thought. -- martin@ : Martin Gregorie gregorie : Harlow, UK demon : co : Zappa fan & glider pilot uk : |
#30
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On Wed, 30 Jun 2004 21:02:30 UTC, Mike Lindsay
wrote: : Incidentally, am I right in thinking that a Bocian held one of the : world women's two-seater records before they were abolished? Free : distance, perhaps? : What!! Women have been abolished??? No, silly. Bocians. Ian -- |
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