Synergy Tech Support
Synergy Electric Helicopters => Synergy E7SE => Topic started by: troasb on September 02, 2015, 05:44:49 AM
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I am now building my E7se. I would like to have more than the usual 4 minutes flying time. What headspeed should I go for if I want to get around 6 minutes flying time? And how much power will I sacrifice then?
I run a Kontronik Pyro 750-50L motor and Optipower 6S 5000mAh 50C batteries.
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I'm running something like 1650, 1800, 1950, and I can get 6 minutes at 1950. That's sport flying. I also use a mAh counter, so I've ditched my timers. I've done the same on my E5s and gone to 8c and am around the 6 minute mark.
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I'm running something like 1650, 1800, 1950, and I can get 6 minutes at 1950. That's sport flying. I also use a mAh counter, so I've ditched my timers. I've done the same on my E5s and gone to 8c and am around the 6 minute mark.
Thank you for your useful reply. That is good news that I can run up to 1950 headspeed. I am also running a Kontronik Kosmic esc so I am going to use a mAh counter too.
But I don't understand what you mean by 8c?
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On my E5, I am running it on 8 cells (2 packs, 4 cells each) and running a 890kv motor.
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On my E5, I am running it on 8 cells (2 packs, 4 cells each) and running a 890kv motor.
So you went to 8S to improve flight times? What capacity do you use on the LiPo's?
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Yes. I am running 2 Pulse Ultra 3700mAh 4 cell packs:
http://www.helidirect.com/plu45-37004-pulse-lipo-3700mah-14-8v-45c-ultra-power-series.html (http://www.helidirect.com/plu45-37004-pulse-lipo-3700mah-14-8v-45c-ultra-power-series.html)
I'm running a lot lower headspeed then most too. I think normal is like 1400, IU1 1600, IU2 around 2000 (maybe 2050). If I stay in IU1 I can get around the 7 minute mark. Depends on how much I beat on it.
I've toyed with going to a 12c setup, but well it'll have to wait till next year if I do and I'd have to see some good gains to do so. If I just bought the E5 and was building it for the first time, I'd give a good consideration of going to 12c, especially if I stretched it right away. Stretching it and staying with the 4025-1100kv motor just killed way too much flight time for me. Plus going to the 2 pack setup, each pack is around $70 and if one goes bad I can replace the one (I'd replace them both due to age) but it's nice to have that option.