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Post by JG on Mar 24, 2016 13:38:20 GMT
Hello Everyone, I was given this electric glider last year from a good friend, we have flown it but sadly the motor has not got enough power to pull it up to great heights, it's running a old brushed 600 motor and a 8.4v battery pack, just wondering what would be a good set up motor and lipo wise for it to get it up ? it has a built up wing and fuselage with a 100" wing span .  |
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Post by Jef on Mar 30, 2016 20:22:12 GMT
Hello JG
The old Brushed 600motors were great for the 100" gliders.
Personally, given the same set up, I would remove the Nickel technology battery and install a 2S1P 2200mAh LiPo pack of 30C or thereabouts, and just give it a go.
If you have a Wattmeter to hand, then it would be a good idea to check the amps drawn from a fully charged battery pack (on a short test run of less than ten seconds, outside, without anyone in front or to the sides of the prop).
The maximum current you will want to draw should be around 30A.
If the current is more than 30A, you will probably burn out the ESC, if you continue to use it. The ESC will probably have a current rating printed on it. Obviously if this is 25A, then you need to aim to reduce the current below 25A. This is done by reducing the size of the propeller.
A fully charged 2S1P LiPo will give 8.4V.
The battery pack will be considerably lighter than the old one. This will give it a better climb rate than it ever had with the Nickel cells.
Keep a close check on the voltage of the LiPo though, as discharging it to too low a voltage will cause irreparable damage. Keep the voltage above 3.6V per cell (7.2V total).
Hope this helps,
Jef
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Post by JG on Mar 31, 2016 11:21:49 GMT
Hello Jef, Yes i was told to go down the route of just trying a 2s lipo and see how it goes, but to be honest after talking to a few people they suggested a 1000kv brushless mortor and a 3s lipo would make it a nice setup, so was thinking of doing that i keep looking on Hoobbyking for a fair price setup  |
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Post by Jef on Mar 31, 2016 18:20:34 GMT
The model has no spoilers so it will never be competitive.
It is not worth throwing away a perfectly good motor.
Keep it brushed, up the battery to a 3S by all means, but reduce the pitch and diameter accordingly.
The wings will flex on launch, if you have a powerful motor in the nose and use it properly, so beware.
Jef
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Post by Jef on Mar 31, 2016 21:04:00 GMT
To put it all into perspective JG,
I was running a brushed set up, in my Reichard Rapid 2.2m, up until less than two years ago, VERY competitively, taking on models 50% larger and beating them in duration and landing accuracy.
When the 13 year old brushed Speed 600 motor wore out, through more than fair 'wear and tear', I changed it for a cheap outrunner with less performance and burnt that out in a few weeks. I recently put an expensive brushless inrunner and gearbox in it, and it has a really high performance climb now.
The Reichard Rapid is built like a brick outhouse, so it is a good platform for a very fast climb.
The new 'hot' motor and gearbox came from a lightweight 100" glider which could not utilise the speed, because the wings went into tuck on the vertical climb.
What I thought was a good solution, and others agreed with, using the perfectly suited motor already in your airframe, was also the cheapest and safest solution, but you seem more interested in getting a bargain motor for the sake of getting a bargain, when the motor you currently have installed, will have been built to a much higher standard!
My original answer was written without explanation, because I didn't think it needed elaboration.
The choice is yours, of course, but at least I have cleared my conscience now, by giving you a better rationale to base your decisions on.
Sorry for prattling on!
Good luck with whatever you decide.
Jef
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