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Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

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Old 01-04-2018, 07:35 PM   #1
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Default would this setup work for me?? need help!

hi, i have a old balsa trainer and im would like to put this
(going to post url)

and this esc
(going to put url)

and i would like to use a 3s 2000 lipo.

i dont know much about matching rc electronics,
im doing this cheap because this is an old trainer i want to fly a couple times and i already put alot of money into two nice planes i got and im scared to fly them LOL
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Old 01-04-2018, 07:36 PM   #2
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MOTOR
https://www.ebay.ca/itm/253223960762

ESC
https://www.ebay.ca/itm/253165941407
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Old 01-04-2018, 07:37 PM   #3
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The battery i want to use is 3s lipo 2200 mah not 2000 mah
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Old 01-04-2018, 07:52 PM   #4
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The motor / esc / battery combo will be fine together ... but it all depends what prop you put on it.

A 4250 motor is suitable for a model of the old 30 - 40 Glow size .. if a trainer.

But disregard the quoted thrust of 2850gr in that ebay page ... that's maxed out and the motor will not last long providing that !

The question is :

What trainer are you looking to put this in ?
Wing span ?
Weight ?
What was motor in it originally ?
What prop are you thinking to use ?

eCalc indicates a 4250 800 with 3S and an 11x5 prop to give about 1100gr thrust ...

Up it to a 12x6 .. and we get nearer 1600gr ....

More info please !!

Nigel

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Old 01-04-2018, 08:42 PM   #5
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The motor in the trainer is an O.S .40 MAX, the wingspan is around 57 inches, the original prop is 10 inches, I guess I could use the 11 5.5 inch prop that's recommended by the motor company,tbh I actually have no clue what sort of prop i should use, (recently got in the hobby)
now I don't know the actual trainer name or company because I got it from a garage sale in the summer with a CG piper cub, i dont have any papers or a box, the weight of the plane I believe is around 800 g, I used a kitchen scale and btw the plane is gutted so no electronics so that reduces the weight
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Old 01-04-2018, 08:46 PM   #6
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I took a look I think a 12-inch prop would work with 1 - 2 inches of clearance
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Old 01-05-2018, 01:26 AM   #7
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They are giving ratings and claims for a 5 cell battery not the 3 cell you have.
The motor is simply not going to turn as fast, that is not necessarily a bad thing.
With less voltage you can use a larger prop, but some times the plane itself limits the size of the prop.

A 40 size plane is designed for about a 10" prop, that being said I put an electric motor in a Sig LT-25 63" WS. the previous owner was going to put an OS 40 in it.
My electric motor was called a Power 30 (not Eflite) it turns 800kv I fly with a 12x6 APC electric prop. That set up required me to use a different landing gear just a little higher.
I fly with a 4 cell battery, it gives me about 850 watts full throttle. It flys GREAT ! it will take my 6lb flying weight plane straight up, or fly gently at 1/4 throttle.

You should get an inline watt meter that will tell you the average current that the motor is pulling at full power, you don't want to burn out the motor. It also will give you a wattage reading of the setup you have.

Motor, prop, and battery all have a dramatic effect on the power you will have to use.
Usually the motor is set by the one you bought and installed.
Different size props will of course give you different power output. even different brands of props all the same size and pitch will give different results.

The ESC you are looking at does not provide power for your radio system. You would need a battery (4.8-6.0 V DC) or a UBC ( universal battery eliminator ) or a different ESC with a BEC circuit

Please keep asking questions, going electric is not quit so straight forward as nitro, so there are thing that we all had to figure out. Sometimes I got it right and sometimes it barely got off the ground, and in the case of my glider it flew more like a racing plane. ( just a bit overpowered )

Dave R, KI7MTA Proud PGR rider.
When you have flying skills like mine,
You become a master at repair.
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Old 01-05-2018, 02:06 AM   #8
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So correct me if I'm wrong, your saying I need a esc with bec, a bigger prop? And possibly re do the landing gear if I need to, about the watt meter stuff, I don't really get it. Like make sure not too much watts are going to the motor?
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Old 01-05-2018, 02:10 AM   #9
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Hehe in my case I don't need to fly verticals LOL just need to learn some flying, I have a dynam DC3 and a nitro piper cub, I haven't flown any of my planes because I cut my fingers on the piper lol good day at the hospital
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Old 01-05-2018, 07:50 AM   #10
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OK .. now we are getting somewhere ... its a 40 size trainer ... that's a typical size from days gone by.

A 38 to 42 size motor is good in the 700 - 1000kv range...

Prop needs to be in the 11 - 12" range

Battery ideally would be a 4S LiPo

ESC about 50A or more capable of 4S, and yes preferably with a decent 5A BEC in it. If not then a separate UBEC of 5A or more.

Does this model have servos ? Control linkages ?

Finally - is there a local flying club ? Get over there and join in ... they will give you all the hands on help as they will have a direct eye on the model and you to advise / help.

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
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Old 01-05-2018, 02:35 PM   #11
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I do not have servos on the model but I ordered some, I do have control horns coming from the rudder and elevator and for the wings I think I need a part to connect the servo horn and the control link
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Old 01-05-2018, 02:45 PM   #12
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If I decide to buy a 4s as well what mah of battery should I get?
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Old 01-05-2018, 02:52 PM   #13
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https://m.ebay.ca/itm/ZTW-Beatles-50...sAAOSw8-tWVtFl

How about this esc
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Old 01-05-2018, 04:43 PM   #14
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OK ... we are slowly getting there ...

It would be really good to give us a picture of the model.

And a list of what you HAVE and what you THINK to order ...

But lets carry on ...

Plane weight about 800gr
Motor about 190gr
Prop about 20gr
Spinner about 20gr
ESC with BEC about 50gr
4 servos about 80gr
Receiver about 20gr

Lets add another 50gr just to be safe for bits andf bobs ...

Total without battery ... 1230gr ....

OK ... I have put some numbers into eCalc and you can choose 4S with 10x6 prop or 11x6 prop on 3S with a 4250 800kv motor.
These will give you more than enough thrust but good throttle range to take you from beginner to intermediate 'throw it around' stage ... ready to move onto your other models !!

Attached.

Oh ... the battery size is 3000mAh and gives about 10mins mixed throttle ... a 2200mAh in either 3 or 4S will give about 8 mins mixed throttle ... (just note change of prop ... )

Nigel


Attached Files
File Type: pdf WF trainer example.pdf (1.19 MB, 4 views)

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
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Old 01-05-2018, 09:45 PM   #15
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List of parts I need
Servos
https://www.amazon.ca/gp/aw/d/B01NA8...VVKLDA4G&psc=1

Receiver
https://www.amazon.ca/gp/aw/d/B007TJ...K6Y9EEQB&psc=1

The motor and esc

And either a 3s or 4s battery (prob gonna get a 3s)
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Old 01-05-2018, 09:46 PM   #16
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ill post my Pinterest link and I have pictures of the plane
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Old 01-05-2018, 09:48 PM   #17
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https://www.pinterest.ca/jakeysbuilds/rc-airplane/

This link works
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Old 01-05-2018, 09:52 PM   #18
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Also since the motor has a shaft coming out the back could I mount the engine directly to the engin mount and drill a hole for that shaft? Because on a different thread people told me I could mount it straight to the engine mount board
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Old 01-06-2018, 12:22 AM   #19
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I am planning on buying the 800kv motor but if u have a different kv motor in mind that would work better tell me because I haven't ordered anything yet
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