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05-21-2014, 03:34 AM | #1 (permalink) |
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Kosmiki timing with new KDE 700XF-455 G3?
Can someone please help and advise me how I should set the timing on a Cool Kosmik 160A for the new KDE 700GX-455 G3 motor. I have left it on automatic in the Kosmik, and the motor is very hot after a short hover.
I have a 12 cell set-up with a standard 13 tooth pinion on a Compass 7HV Ultimate. Andy |
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05-21-2014, 07:24 AM | #2 (permalink) | |
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Join Date: May 2011
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Quote:
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Richard Zappe Team Kontronik USA PeakAircraft |
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05-21-2014, 07:51 AM | #3 (permalink) |
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Thank Richard,
I have just looked at the KDE site, and although they say that the 700XF runs most efficiently and coolest at 0 timing (or 5 deg), they say with the Kosmik to use the Auto Timing. So I will leave at this to start with. Another question is that where I have programmed APM and then Mode 4, my understanding is that this has no brake function, although it looks like this can be programmed with the Progdisk even in this mode (not that I want it!), but the selection of brake on / off is not very obvious like the other selection function. For example, I want to confirm that the brake is off, so I go to this parameter in the list and see the brake shows 'off' but then a brake figure of 75%. I select the brake 'off' by tilting to the right to then confirm off, and it changes to on! Very confusing. Regards, Andy |
05-21-2014, 08:11 AM | #4 (permalink) | |
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Join Date: May 2011
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Also what do you consider hot can you hold your hand on it indefinitely or is it too hot to touch?
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Richard Zappe Team Kontronik USA PeakAircraft |
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05-21-2014, 09:35 AM | #5 (permalink) |
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Join Date: Aug 2009
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KDE motors run very hot. 180-200F is not uncommon during the California summers.
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05-21-2014, 10:21 PM | #6 (permalink) | |
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Join Date: Aug 2011
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The way to think about it is to select the option where it is not possible to adjust the brake %.
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Goblin 700C "Sabrina", Logo 500 "Maika", Kosmik, HC3-SX, DX-9 |
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05-22-2014, 03:52 AM | #7 (permalink) |
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Thank you all,
I think I have got the sense of it now, but as has been said, the logic is different from all the other menu items! The KDE did run hot, but I had my head speed too high and am going to see how it goes at a much lower head speed. The KDE website suggests just leaving the motor to the automatic timing of the Kosmik, but I wonder if anyone else has tried this at 0 degrees - does this help much? Richard, I will email the guy at KDE and see whether he has any further advice. Thanks, Andy |
05-23-2014, 04:17 AM | #8 (permalink) |
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Thank you Wh1teAfr1can,
I received a very kind email back from Patrick Koegler who sounds like a fantastic advocate for KDE, and great at customer service and support. I hope he will not mind if I copy his reply to my email, but I thought the information might be useful to many people. Here is his response: "Hey Andrew, Auto-Timing works exceptionally well with the KOSMIK series and this is the recommended setting for the new G3 motors, and typically, temperatures and nothing of concern on this. The entire motor is rated to over 400F, so no concerns of any damage from heat-generation. In actuality, when the motor is running in the flight, the centrifugal fan is efficient at keeping the motor cool and consistent, designed to run around 120F-140F during a flight as optimal performance. When you land and shut down the centrifugal fan, you’ll experience a motor that feels much hotter than during operation, simply due to the high-performance design of the motor. With high-performance motors, there is a high-copper concentration stored in the motor which naturally stores heat during flight. When the fan is shutdown, all the heat is expelled to the outer case and what you are feeling is the heat conducting to the Aluminum Fan, as it’s designed to do. In this, the temperature may feel hot, but this is normal for all high-performance motors and nothing of concern due to the quality of the components. If you are after purely efficiency and cooler-running temperatures, you can set this to a fixed timing of 5° in the KOSMIK programming. The power is limited at the top-end versus using the Auto-Timing algorithm, but it will raise the overall efficiency of the motor and reduce temperatures. It’s not needed and Auto-Timing is most optimal for best balanced performance, but you can also do this as an option if you would like. Hope this helps and thanks for supporting the KDE Direct brand! Thanks, Patrick Owner, KDE Direct" Thank you again Patrick, and good luck with your endeavours with KDE. Regards, Andy |
05-25-2014, 08:52 PM | #9 (permalink) |
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I've just completed some further test flights and have been getting 120 - 130 degrees F (49 - 55 degrees C).
This was after reprogramming the Cool Kosmik, running in hover at 70%, equating to about 1550 rpm (KDE 700XF-455-G3 and 13 tooth pinion on slant gear 7HV, ambient temperature in Melbourne of about 20 C, or 68 F). Regards, Andy |
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