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#81
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$1 billion BMS Ooops...
Moshe Braner wrote on 3/7/2021 2:07 PM:
But I'm getting further off topic.* Gliders are nice.* They don't need no steenkin' engines. Alright! Back to Basics: bungey launch! Or is it still OK to use electric motors? No steenk there. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 |
#82
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$1 billion BMS Ooops...
On Sunday, 7 March 2021 at 22:04:16 UTC, Moshe Braner wrote:
On 3/7/2021 8:31 AM, Martin Gregorie wrote: On Sun, 07 Mar 2021 04:44:36 -0800, Mark Mocho wrote: It suggests one way to make mass electric-powered air transport work: Put the pax and cargo in nice accommodation on a large airship and tow it cross country behind an electric locomotive running on repurposed AmTrak tracks. And just what happens when the train goes under a bridge? Another unicorn inspired idea. Keep 'em coming. I need the laughs. The author is a bit more than a unicorn, methinks. He's well-regarded in technical circles. Anyhow, if such a system was set up it could obviously only work on lines that have no tunnels and that don't run in deep valleys (so not on the Glendale-Denver line obviously), and that have been 'adjusted' so that the line is always at the top of the crossing stack. It would also be faster than the old Goon Show concept of horse-drawn zeppelins. Or you can use the newfangled idea of making that airship very narrow and fly it very low to the ground so it can go under the bridges and through tunnels. Oh wait... While the rest of the world has double-tracked and electrified their long-range railroads (e.g., the trans-Siberia), here in the US we sit on our heels while a few loonies play with "pods" and other nonsense. But I'm getting further off topic. Gliders are nice. They don't need no steenkin' engines. I have yet to see a glider take off (bungee launches excepted) or return from a field without an engine. |
#83
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$1 billion BMS Ooops...
I have yet to see a glider take off (bungee launches excepted) or return from a field without an engine.
Does the one in the tow vehicle count? |
#84
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$1 billion BMS Ooops...
I have yet to see a glider take off (bungee launches excepted) or return from a field without an engine. See and believe: https://youtu.be/_JNg9zwvDkI?list=PLC40EB4949AD5395B Been there, done that. With a favorable wind one circle was enough to get high over the heads of the observers at the gravity launch site, and hours long ridge/wave soaring was possible. BTW, Bezmiechowa is the place where Wanda Modlibowska set a new women's duration record of 24 hours 14 minutes in May 1937. When I was there for the first time, other pilots from our group did night ridge soaring in a 'Bocian' glider (by design equipped with position lights). The ridge line was marked with a series of campfires. In 1993-95 night flights were still part of the training for licensed glider pilots in some places in Poland. Happy to have that exotic (and extinct?) endorsement in my logbook. Just keen memories in a thread about dreams about self-launching gliders (in expectation of a new soaring season). |
#85
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$1 billion BMS Ooops...
On 3/7/2021 6:08 PM, Eric Greenwell wrote:
Moshe Braner wrote on 3/7/2021 2:07 PM: But I'm getting further off topic.Â* Gliders are nice.Â* They don't need no steenkin' engines. Alright! Back to Basics: bungey launch! Or is it still OK to use electric motors? No steenk there. Lighten up, Eric and others. I was just saying that in gliders we don't need to be dragged cross-country by a locomotive. I have nothing against launching by some motorized thing or another. And back to the topic, we have some people who believe all the hype from Saint Elon about new batteries etc, and others who are more skeptical. But we all revel in what has been achieved in electric glider launching and sustaining, and hope for more. It's a lot more feasible than electric air transport. Personally I think that dragging an expensive battery pack along in every glider is inefficient use of resources. But then you may say the same about dragging equally, if not more, expensive composite structures around the sky. We do what we have to do to achieve our aerial dance performances. Then we land, and like any performance art, it's all gone poof, into the past. We only do it because we love it. |
#86
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$1 billion BMS Ooops...
On Thursday, March 4, 2021 at 1:55:30 PM UTC-8, Kenn Sebesta wrote:
A hybrid system with a gas engine wouldn't have the pucker factor associated with starting a gas powered motorglider to avoid a landing: if the hybrid engine doesn't start, it just means your potential retrieve distance is shorter, instead of an imminent landing. I'll wade in here with some experience. Top Flight, a Boston startup specializing in hybrid propulsion systems, spend over half a decade developing their power unit. The hardest part for them was developing a unit which was reliable. Motors don't like vibration and they don't like heat. Combine the two together and the motor is not long for this world. It took a lot more R&D than anyone expected to make a lightweight package which could survive.. I would not expect anyone to be deploying this technology anytime soon. If and when it is commercialized, it will be useful for ferry flights of electric aircraft. For any use which requires permanent installation, you're probably better having it drive the propeller directly. eGliders, I sense a tone here which is reminiscent of discussions about finally putting the 2-33 to rest. The US is no longer the forefront of light aviation, so we need to look east to see what the trends are. We know that leading glider manufacturers are racing to bring eGliders to market. A gentleman who works on glider competition rules noted this summer that glider records are falling left and right to eGliders. There is a growing group of amateurs who are pulling their engines out of their gas self-launchers and replacing them with electric (If you'd like to be a part of this group, DM me). The future was yesterday, but like any future it doesn't arrive at all places at once. Why don't you start by naming JUST ONE that replaced an ICE with an electric. Tom |
#87
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$1 billion BMS Ooops...
Tom BravoMike wrote on 3/7/2021 5:48 PM:
I have yet to see a glider take off (bungee launches excepted) or return from a field without an engine. See and believe: https://youtu.be/_JNg9zwvDkI?list=PLC40EB4949AD5395B Been there, done that. With a favorable wind one circle was enough to get high over the heads of the observers at the gravity launch site, and hours long ridge/wave soaring was possible. BTW, Bezmiechowa is the place where Wanda Modlibowska set a new women's duration record of 24 hours 14 minutes in May 1937. When I was there for the first time, other pilots from our group did night ridge soaring in a 'Bocian' glider (by design equipped with position lights). The ridge line was marked with a series of campfires. In 1993-95 night flights were still part of the training for licensed glider pilots in some places in Poland. Happy to have that exotic (and extinct?) endorsement in my logbook. Just keen memories in a thread about dreams about self-launching gliders (in expectation of a new soaring season). Bungee AND gravity launch! Yahoo! -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 |
#88
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$1 billion BMS Ooops...
2G wrote on 3/7/2021 8:30 PM:
On Thursday, March 4, 2021 at 1:55:30 PM UTC-8, Kenn Sebesta wrote: A hybrid system with a gas engine wouldn't have the pucker factor associated with starting a gas powered motorglider to avoid a landing: if the hybrid engine doesn't start, it just means your potential retrieve distance is shorter, instead of an imminent landing. I'll wade in here with some experience. Top Flight, a Boston startup specializing in hybrid propulsion systems, spend over half a decade developing their power unit. The hardest part for them was developing a unit which was reliable. Motors don't like vibration and they don't like heat. Combine the two together and the motor is not long for this world. It took a lot more R&D than anyone expected to make a lightweight package which could survive.. I would not expect anyone to be deploying this technology anytime soon. If and when it is commercialized, it will be useful for ferry flights of electric aircraft. For any use which requires permanent installation, you're probably better having it drive the propeller directly. eGliders, I sense a tone here which is reminiscent of discussions about finally putting the 2-33 to rest. The US is no longer the forefront of light aviation, so we need to look east to see what the trends are. We know that leading glider manufacturers are racing to bring eGliders to market. A gentleman who works on glider competition rules noted this summer that glider records are falling left and right to eGliders. There is a growing group of amateurs who are pulling their engines out of their gas self-launchers and replacing them with electric (If you'd like to be a part of this group, DM me). The future was yesterday, but like any future it doesn't arrive at all places at once. Why don't you start by naming JUST ONE that replaced an ICE with an electric. Tom Hank Nixon. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 |
#89
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$1 billion BMS Ooops...
On Sunday, March 7, 2021 at 8:52:23 PM UTC-8, Eric Greenwell wrote:
2G wrote on 3/7/2021 8:30 PM: On Thursday, March 4, 2021 at 1:55:30 PM UTC-8, Kenn Sebesta wrote: A hybrid system with a gas engine wouldn't have the pucker factor associated with starting a gas powered motorglider to avoid a landing: if the hybrid engine doesn't start, it just means your potential retrieve distance is shorter, instead of an imminent landing. I'll wade in here with some experience. Top Flight, a Boston startup specializing in hybrid propulsion systems, spend over half a decade developing their power unit. The hardest part for them was developing a unit which was reliable. Motors don't like vibration and they don't like heat. Combine the two together and the motor is not long for this world. It took a lot more R&D than anyone expected to make a lightweight package which could survive.. I would not expect anyone to be deploying this technology anytime soon.. If and when it is commercialized, it will be useful for ferry flights of electric aircraft. For any use which requires permanent installation, you're probably better having it drive the propeller directly. eGliders, I sense a tone here which is reminiscent of discussions about finally putting the 2-33 to rest. The US is no longer the forefront of light aviation, so we need to look east to see what the trends are. We know that leading glider manufacturers are racing to bring eGliders to market.. A gentleman who works on glider competition rules noted this summer that glider records are falling left and right to eGliders. There is a growing group of amateurs who are pulling their engines out of their gas self-launchers and replacing them with electric (If you'd like to be a part of this group, DM me). The future was yesterday, but like any future it doesn't arrive at all places at once. Why don't you start by naming JUST ONE that replaced an ICE with an electric. Tom Hank Nixon. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 And what was the glider? |
#90
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$1 billion BMS Ooops...
On Monday, March 8, 2021 at 12:06:57 AM UTC-5, 2G wrote:
On Sunday, March 7, 2021 at 8:52:23 PM UTC-8, Eric Greenwell wrote: 2G wrote on 3/7/2021 8:30 PM: On Thursday, March 4, 2021 at 1:55:30 PM UTC-8, Kenn Sebesta wrote: A hybrid system with a gas engine wouldn't have the pucker factor associated with starting a gas powered motorglider to avoid a landing: if the hybrid engine doesn't start, it just means your potential retrieve distance is shorter, instead of an imminent landing. I'll wade in here with some experience. Top Flight, a Boston startup specializing in hybrid propulsion systems, spend over half a decade developing their power unit. The hardest part for them was developing a unit which was reliable. Motors don't like vibration and they don't like heat. Combine the two together and the motor is not long for this world. It took a lot more R&D than anyone expected to make a lightweight package which could survive.. I would not expect anyone to be deploying this technology anytime soon. If and when it is commercialized, it will be useful for ferry flights of electric aircraft. For any use which requires permanent installation, you're probably better having it drive the propeller directly. eGliders, I sense a tone here which is reminiscent of discussions about finally putting the 2-33 to rest. The US is no longer the forefront of light aviation, so we need to look east to see what the trends are. We know that leading glider manufacturers are racing to bring eGliders to market. A gentleman who works on glider competition rules noted this summer that glider records are falling left and right to eGliders. There is a growing group of amateurs who are pulling their engines out of their gas self-launchers and replacing them with electric (If you'd like to be a part of this group, DM me). The future was yesterday, but like any future it doesn't arrive at all places at once. Why don't you start by naming JUST ONE that replaced an ICE with an electric. Tom Hank Nixon. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "A Guide to Self-Launching Sailplane Operation" https://sites.google.com/site/motorg...ad-the-guide-1 And what was the glider? ASW-24e |
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