Synergy Tech Support
Other Manufacturer => General Heli Support => Topic started by: Dean H on November 26, 2015, 06:04:57 AM
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I plan on running a headspeed of 1250-1500 on my E5SS. I am not familiar with Kontronik and I'm researching purchasing a Kontronik 700-52 and a Jive Pro ESC. Is there a formula for figuring out what wattage or amps a certain headspeed will produce at a certain voltage? Or how many watts per pound is needed on a heli? If V * A = W and I have a Jive Pro 80HV lets say the heli is running at 60A. A 7s will give me approx. 24.5V under a load. so, 24.5 * 60A = 1470W but what is the actual HS at 1470W or 60A?
Basically, I want to know if I can get away with a Jive Pro 80HV ESC at 1200-1500 RPM on 7S ?
Also wondering if I should go 560Kv? I have 12T, 13T and 14T pinions. It appears that 60%-80% will give me my target HS range with 520Kv and 13T pinion. Need help understanding how Kontronik works.
Thanks for your advice!
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I plan on running a headspeed of 1250-1500 on my E5SS. I am not familiar with Kontronik and I'm researching purchasing a Kontronik 700-52 and a Jive Pro ESC. Is there a formula for figuring out what wattage or amps a certain headspeed will produce at a certain voltage? Or how many watts per pound is needed?
Basically, I want to know if I can get away with a Jive Pro 80HV ESC at 1200-1500 RPM on 7S ?
Also wondering if I should go 560Kv? I have 12T, 13T and 14T pinions. It appears that 60%-80% will give me my target HS range with 520Kv and 13T pinion. Need help understanding how Kontronik works.
Thanks for your advice!
Running a dedicated 7s setup you will want the 560kv and probably a 15t pinion to reach your desired headspeeds with the Jive Pro. If I were you I would get the 120 just to be future proof if nothing else, you might want to change up your setup one day. I'm not sure what kind of power your setup will draw. It's a very efficient motor and on 7s it should be low, but with a 15t pinion in a 700 it may not be as low as you would expect. You'll still be pushing the PWM high so it could still be in the 100A+ range fairly often depending on how you fly. That's just a guess sitting here looking at some old logs of mine from a Helijive 120 / Pyro 700 combo.
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Thanks Danny! I'm a careful sport flyer:) and my collective management is getting better!
I'm trying to cut grams everywhere I can, maybe unnecessarily as disc loading with 716's willl be light anyway and you're spot on, I may want to beef it up in the future; however, I do have 2 goblins if I want to get crazy.
How does the Kontronik gov. work as it relates to the pinion size as I've been thinking a 14T would work?
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You just throw the pinion on and fly :) There are no programmed headspeeds in the unit itself. Kontronik gov is super easy to set up - just program mode 4 and fly! Headspeed is set purely by a flat line throttle percentage in the tx. If it's not fast enough, higher flat line throttle %. You can run between 50% to 80% throttle with great gov preformance in mode 4. Use the logs or a tach to see what exact RPM you're running. I always look at the logs.
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I usually start a new setup with three headspeeds in my tx at 55%, 65%, 75% and see what speeds that gives me. Fine tune from there.
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Thanks, Danny! Do I need to calibrate the ATV? Mr Mel's HS calc. gves HS options with and without ATV callibrated.
P.S.my Tx is the VControl and I'm running the VBar Silverline on this build.
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You don't have to change any throttle endpoints. Just use a charged pack and set a 0-100% "normal" throttle curve in your tx to program the Jive. First set it to "mode one" (this calibrates the throttle), cycle power, and then set mode 4 and you're ready to go. No gov tuning required, just set your throttle percentages and have fun :)
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Bear in mind - my real world headspeeds always end up about 200rpm below what Mr Mel's calculator says.
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Sounds easy and I like easy and not tuning is even better! How do you know when you have the optimum headspeed set? What do I look for in the logs?
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If you know you're looking for a certain speed you can fine tune by looking at your logs to see if it needs to go up or down. Otherwise I usually just go by what feels good on the sticks ;)
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Not really looking for a specific head speed more an efficient running system close to my desired HS and a heli that feels good in the air!
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I particularly like the CGY gov with the scorpion esc. It's a bit soft at 1500 and below but I have it set that way. At 1800 and above the response is very tight. Maybe because of the added static drag?
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Here's a short video of this set up in an E7Se. Scorpion Commander 130A with a Scorpion Nick Maxwell edition. Both run cool...
https://youtu.be/nADcoBZyIlg
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nice flight!
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I'll be running between 1250-1500 head speed and what active freewheeling.
Cool flight!
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I'm running the Scorpion Commander 160A opto now. The 130A would over currently at the higher head speed (2050) but for 1500 hs on 12s 5000mAh packs it held up fine.
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I'm going to run a single 7S 5000 pack. Should be fun!