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First electric model

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Colin Birch18/09/2015 19:05:45
8 forum posts

As a newbie to electric flight, I've been trying to get to grips with Tim Mackey's stickys (ooh matron) and have come up with the following for the DB S & S Tyro Major I'm building.





12 x 8

Any thoughts on the above? Have I got it all wrong? I'm confused, my brain hurts.crook

john stones 118/09/2015 19:17:27
11447 forum posts
1516 photos

Should be a 4s lipo for 12x8 prop Colin, 3s it gives 14x10


Edited By john stones 1 on 18/09/2015 19:19:28

andyh18/09/2015 19:56:54
428 forum posts
22 photos

I would think you'd want a 3S or 4S LiPo - the one you've linked to is 2S

PatMc18/09/2015 20:30:07
4382 forum posts
524 photos

As pointed out above, the lipo linked is 2s battery which wouldn't be suitable for this model at all, IMO a 4s would be best option with the motor chosen.
Also all the links are to the international warehouse, if you are in UK (or Europe) a purchase from this warehouse would be liable to additional tax plus other charges & the shipment time would be prolonged.
The motor doesn't seem to be available from the UK & the ESC is out of stock in UK however they could be obtained from the European warehouse together with a suitable battery.

IMO this battery would be do, this 40C one would potentially give more oomph (probably not needed in this model) but you would need to change the connector either on it or the ESC, this Zippy 3000 is another candidate then there are a few more in the Zippy range to choose from.



Edited By PatMc on 18/09/2015 20:32:56

Colin Birch18/09/2015 20:59:33
8 forum posts

Yes sorry, distracted by the rugby on telly, meant to link to a 3s not 2s. I only used the links to that particular site to give an example of what sort of equipment to use. Thanks for the suggestions. I'll get there in the end, hopefully.

Allan Bennett18/09/2015 21:02:03
1654 forum posts
49 photos

One thing you must add to your shopping list is a wattmeter, like this one so that you can verify that your prop selection is correct for the particular motor and battery voltage.

The one thing about electric that took me a while to get my head around when converting from glow is that you can alter any electric motor's power output simply by changing the prop size -- to the extent that it will burn itself out if you put too big a prop on it, and may burn out the speed controller and battery too, by drawing too many amps.

By all means use the "recommended" size prop as a starting point, but you must check its full-throttle amps with the wattmeter, for not all props are created equal even though they're the same nominal size. If the amps are more than the motor's spec, try a smaller prop.

Edited By Allan Bennett on 18/09/2015 21:02:36

Colin Birch18/09/2015 21:05:44
8 forum posts

Yes good advice. A wattmeter is on the shopping list.

Colin Birch24/09/2015 11:04:46
8 forum posts

Okay, I've gone with 710kv Turnigy G25 motor with max claimed current of 44amps and a 60 amp ESC. I'm allowing space to fit a 4S so I know a 3S will fit if necessary. Not sure about prop yet but probably 12 x 6 with a 4S or 13 x 4 maybe with a 3s fitted will give me a starting point to check with a wattmeter. HK's web page gives test data for this motor of 14.8v -13 x 4 prop - 26amps - 2200 kg thrust.

Any comments on the above appreciated.

Also a question about motor mounting. The original plan for an IC engine shows approx 4 degrees down and 2 degrees side. Presumably I mount the leccy motor the same?

John F24/09/2015 11:49:01
1316 forum posts
51 photos

I found that it needs down and side thrust but different to that quoted, so a variable thrust setup using threaded studs is what I was advised to do and it works a treat.

More info here: **LINK**

john stones 124/09/2015 11:59:00
11447 forum posts
1516 photos

Think it's pretty much fly it and see Colin, amount of thrust needed you'll fine tune once flown, info on plans only a suggested start point, will be easy to adjust on a Tyro smiley


Colin Birch24/09/2015 16:41:17
8 forum posts

Thanks for the link John F, very usefull. I'll set it up as per the drawing as a starting point then see what happens when/if it flies. Thanks for all your responses, any comment re the leccy choice? Anyone?

john stones 124/09/2015 17:21:05
11447 forum posts
1516 photos

What will the model weigh Colin ? if it's 5lb or below it sounds o.k to me, I would be using the 4s I reckon. Feel free to correct me if i'm wrong folks.


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