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  • Solo 2350 start issues

    From Ben Wilson@21:1/5 to All on Wed Jan 25 00:30:29 2023
    Hi,
    I’m after some insight regarding my LS8 which is running the solo2350.
    I purchased it second hand and I’ve always known about the issue so did the previous owner with himself sending the engine away for inspection, no successful outcome. It start fine.. but I have to dive to 85-90kts for it to windmill fast enough to get
    cranking. Not ideal close to the ground. From other turbo owners they usually start around the 70kt mark.
    Any and all suggestions are welcome.

    Cheers

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  • From Christoph Barniske@21:1/5 to All on Wed Jan 25 01:38:57 2023
    Hi,

    it's a known issue of the LS/DG sustainer system. It needs more airspeed than other systems to start properly, hence loses more altitude. The propeller needs quite a high airspeed to bring the engine RPM to the level needed for proper ignition. A friend
    acquired an LS8st two years ago. He had the same experience and stated after a few flights that he is checking engine RPM before closing decompression valves. RPM need to exceed a certain level for proper ignition. This works well for him.

    Best
    Christoph

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  • From krasw@21:1/5 to All on Wed Jan 25 03:27:35 2023
    LS8-st requires 30 kph more speed that Schempp or Schleicher turbos to start. Handbook speed is absolutely minimum for warm engine, cold engine usually requires 15-20 kph more speed. Way to save some altitude is to accelerate first, and pull deco then,
    as acceleration with propeller rotating is slow. LS8-st requires more altitude than others for safe start, but mine has been 100% reliable to start with proper speed. You do not operate it, or any other windmilling turbo close to ground. Very simple rule.

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  • From Drone 2.0@21:1/5 to [email protected] on Wed Jan 25 07:08:24 2023
    On Wednesday, January 25, 2023 at 2:30:31 AM UTC-6, [email protected] wrote:
    Hi,
    I’m after some insight regarding my LS8 which is running the solo2350.
    I purchased it second hand and I’ve always known about the issue so did the previous owner with himself sending the engine away for inspection, no successful outcome. It start fine.. but I have to dive to 85-90kts for it to windmill fast enough to
    get cranking. Not ideal close to the ground. From other turbo owners they usually start around the 70kt mark.
    Any and all suggestions are welcome.

    Cheers
    The belt could be overtight , ( if its too loose there will be starting issues) It could be loosened to slightly less torque then what its set at now,

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  • From Drone 2.0@21:1/5 to krasw on Wed Jan 25 07:08:53 2023
    On Wednesday, January 25, 2023 at 5:27:38 AM UTC-6, krasw wrote:
    LS8-st requires 30 kph more speed that Schempp or Schleicher turbos to start. Handbook speed is absolutely minimum for warm engine, cold engine usually requires 15-20 kph more speed. Way to save some altitude is to accelerate first, and pull deco then,
    as acceleration with propeller rotating is slow. LS8-st requires more altitude than others for safe start, but mine has been 100% reliable to start with proper speed. You do not operate it, or any other windmilling turbo close to ground. Very simple rule.

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  • From Hank Nixon@21:1/5 to krasw on Wed Jan 25 07:51:53 2023
    On Wednesday, January 25, 2023 at 6:27:38 AM UTC-5, krasw wrote:
    LS8-st requires 30 kph more speed that Schempp or Schleicher turbos to start. Handbook speed is absolutely minimum for warm engine, cold engine usually requires 15-20 kph more speed. Way to save some altitude is to accelerate first, and pull deco then,
    as acceleration with propeller rotating is slow. LS8-st requires more altitude than others for safe start, but mine has been 100% reliable to start with proper speed. You do not operate it, or any other windmilling turbo close to ground. Very simple rule.

    '29E requires about 25 kph more than the manual says to reliably start.
    Wait too long- land with non running engine out.
    Been there- done that.
    UH

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  • From krasw@21:1/5 to Dan Marotta on Wed Jan 25 12:13:47 2023
    On Wednesday, 25 January 2023 at 21:19:12 UTC+2, Dan Marotta wrote:
    What difference between gliders would make so much airspeed difference required to start the same engine? Different propeller, perhaps?

    Dan
    5J
    On 1/25/23 08:51, Hank Nixon wrote:
    On Wednesday, January 25, 2023 at 6:27:38 AM UTC-5, krasw wrote:
    LS8-st requires 30 kph more speed that Schempp or Schleicher turbos to start. Handbook speed is absolutely minimum for warm engine, cold engine usually requires 15-20 kph more speed. Way to save some altitude is to accelerate first, and pull deco
    then, as acceleration with propeller rotating is slow. LS8-st requires more altitude than others for safe start, but mine has been 100% reliable to start with proper speed. You do not operate it, or any other windmilling turbo close to ground. Very
    simple rule.

    '29E requires about 25 kph more than the manual says to reliably start. Wait too long- land with non running engine out.
    Been there- done that.
    UH

    I have only 100+ hrs in 29E, but I did not have trouble starting it by the book.

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  • From Dan Marotta@21:1/5 to Hank Nixon on Wed Jan 25 12:19:08 2023
    What difference between gliders would make so much airspeed difference
    required to start the same engine? Different propeller, perhaps?

    Dan
    5J

    On 1/25/23 08:51, Hank Nixon wrote:
    On Wednesday, January 25, 2023 at 6:27:38 AM UTC-5, krasw wrote:
    LS8-st requires 30 kph more speed that Schempp or Schleicher turbos to start. Handbook speed is absolutely minimum for warm engine, cold engine usually requires 15-20 kph more speed. Way to save some altitude is to accelerate first, and pull deco then,
    as acceleration with propeller rotating is slow. LS8-st requires more altitude than others for safe start, but mine has been 100% reliable to start with proper speed. You do not operate it, or any other windmilling turbo close to ground. Very simple
    rule.

    '29E requires about 25 kph more than the manual says to reliably start.
    Wait too long- land with non running engine out.
    Been there- done that.
    UH

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  • From Ben Wilson@21:1/5 to All on Wed Jan 25 16:46:45 2023
    Hi everyone,

    Thanks for the quick reply’s. From the recommendations above I won’t be sending it away for inspection and wasting my money doing so. I’ll just have to live with the higher airspeed required with the LS8 to start it. I like the tip of diving to the
    required airspeed then pulling the decompression lever instead of the dive while having a windmilling prop/extra drag.

    Cheers
    Ben Wilson
    New Zealand

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  • From krasw@21:1/5 to Dan Marotta on Thu Jan 26 03:10:53 2023
    On Wednesday, 25 January 2023 at 21:19:12 UTC+2, Dan Marotta wrote:
    What difference between gliders would make so much airspeed difference required to start the same engine? Different propeller, perhaps?

    Dan

    LS turbo propeller looks like it came from a boat, so yes. The climb rate is ok, though.

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  • From Muttley@21:1/5 to krasw on Fri Jan 27 10:54:01 2023
    On Thursday, January 26, 2023 at 11:10:56 AM UTC, krasw wrote:
    On Wednesday, 25 January 2023 at 21:19:12 UTC+2, Dan Marotta wrote:
    What difference between gliders would make so much airspeed difference required to start the same engine? Different propeller, perhaps?

    Dan
    LS turbo propeller looks like it came from a boat, so yes. The climb rate is ok, though.


    Priming the engine on the Ground before flight might help

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