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Jul 10, 2018, 11:26 AM
Registered User
Question

48" Glider 540 Motor, will it be too heavy?


Hey I recently built a dollar tree foam board plane with a 2826 outrunner on it, its on 3s and its pretty fast. I am now building a plane with a 48" foam glider I got at the store. It has a 48" wingspan so I wanted to know if it could fly with a 540 inrunner its supposed to pull 900w and I got 80 amp Esc. The Esc and Motor together will weigh 277g (10.4oz) not including the rest of the plane. Do you guys think I have enough lift from the 48" wings to keep it in the air?

If not I would buy a 2845 3100kv inrunner instead. Which is 148g motor and esc which is lighter but I feel like the speed wont be there. I got the idea from Ramy Rc and there LIDL Glider but the LIDL only has 33" wing span with a 2838 inrunner.

Does my extra 15" of wing allow for a 540 size inrunner motor or should I play it safe with the 2845 inrunner? Thanks!

Also the 2845 3100kv pulls 800w which is 100a less and 129g lighter. So should I go for the extra 100a and more torque from 540 or lighter motor?
Last edited by brymck1901; Jul 10, 2018 at 01:08 PM. Reason: More Info;; and wrong 2845 ESC+Motor weight
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Jul 10, 2018, 12:13 PM
Registered User
Hello,
What prop are you planning on using?
Jul 10, 2018, 12:26 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
I would use the factory recommended electronics for the 48" glider .
Jul 10, 2018, 12:28 PM
treefinder
springer's Avatar
Such heavy inrunners are an odd motor type for a glider. What do you want out of the plane?Starting with a 'glider' are you intending to end up with a glider, or a regular plane. Generally inrunners are high rpm and want a small prop. Unless you are looking for a hundred mph plus plane ( which the wallyworld foam glider will never be) you would be better with an outrunner (50-70gm 1200kv or so) and a 9-10" prop. That will give a large speed range for good flying.
Jul 10, 2018, 12:32 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Is this a 48" RC glider or a 48" toy chuck glider ?
Jul 10, 2018, 12:50 PM
Registered User
Quote:
Originally Posted by Maarten035
Hello,
What prop are you planning on using?
My prop of choice is 5x5 APC Electric.

The motor will run well within amps I dont need help with that I just need to know if the 540 weighing 277g and pulls 900w with esc is to heavy for 48" wingspan glider. Using 540 for speed Im basically gonna make a foam hotliner.

But the 2845 weighs 148g and pulls 800w and should be able to spin a 6x3 or 6x4 conservatively with 80a ESC.

So which one lighter but close to same performance or all out performance but more weight?
Last edited by brymck1901; Jul 10, 2018 at 01:11 PM.
Jul 10, 2018, 12:58 PM
Registered User
Quote:
Originally Posted by springer
Such heavy inrunners are an odd motor type for a glider. What do you want out of the plane?Starting with a 'glider' are you intending to end up with a glider, or a regular plane. Generally inrunners are high rpm and want a small prop. Unless you are looking for a hundred mph plus plane ( which the wallyworld foam glider will never be) you would be better with an outrunner (50-70gm 1200kv or so) and a 9-10" prop. That will give a large speed range for good flying.
I am going for speed so 5x5 prop, but yes its foam and I dont really care for numbers like it doesnt have to go 100mph I just want some that will look like its going fast like im not gonna radar it or anything. But if you watch the Ramy Rc video they used inrunner on LIDL glider and it looked really fast with a small prop and high kv, so that is my thinking here. But it will be well reinforced.

I just need to know if the extra 100w and torque from the 540 size inrunner is neccassary when I can use 2845 which is rated at 800w.

540- 277g -900w

2845- 148g -800w
Last edited by brymck1901; Jul 10, 2018 at 01:06 PM. Reason: wrong weight for 2845
Jul 10, 2018, 01:06 PM
Registered User
Quote:
Originally Posted by balsa or carbon
Is this a 48" RC glider or a 48" toy chuck glider ?
Its a chuck glider i reinforced with carbon spars and added a thin layer of this CA stuff for more rigidity. It says glider but really I want to use it as a hot liner so I dont want anything slow flying so thats why im asking will I get enough lift with a 48" wingspan to lift the 540 motor which weighs 277g with motor and esc not including battery or plane itself.
Jul 10, 2018, 01:37 PM
Registered User

Main Questions Needed Answered


I tried to leave as much info as possible but the only questions I need answered is will the 48" wingspan of a chuck glider be enough lift to carry the 277g 540 and 3500kv motor which pulls 900w?

Or should I go with the lighter 2845 at 148g pulling 800w 3100kv?

I know the the plan can lift the 2845 no problem as I've seen in the Ramy Rc video with there LIDL glider with 33" wing span. and I have tested all the amps and propellers sizes so no need for help on that just will the weight be to much for 48" wingspan?

(A little extra) I want to go with the 540 for more torque and just all out performance but will the 540 and 2845 given the specs of the motors perform somewhat the same?

**I wont be able to respond as fast till after work but please ask and answer away!**
Jul 10, 2018, 02:32 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Yes , with enough speed . It may be very difficult to get enough speed at launching , perhaps a catapult launcher would help .

But my biggest concern with trying to make a hotliner out of a chuck glider would be the strength of the styrofoam airframe .
Jul 10, 2018, 10:32 PM
Sokol
JureZ's Avatar
the 48" chuck glider that you mention may be one of the Sky Riders you may buy at Wal Mart ...?
look at what I did with a 25g motor for example.

https://www.rcgroups.com/forums/show...der-plane-bash

in your case , the stall speed will increase , and with the higher wing loading it will have to fly fast to stay airborne.
The structure will have to withstand the stresses involved at the higher velocities.

Sky Riders - Movie (2 min 27 sec)
Last edited by JureZ; Jul 11, 2018 at 09:38 AM. Reason: added pics and link
Jul 10, 2018, 10:53 PM
treefinder
springer's Avatar
I guess the best answer is either will work. If you have the larger one, no reason to not try it. As BoC said, with that tiny prop, you get lots of pitch speed but not lots push so you may find you will need to help it off the line. Another thought is that as you increase motor size you generally increase battery and eventually reach a point of diminishing returns and the plane will slow down. There are calculators to figure that out, but it is probably as easy to just try it. Let us know how it works.
Jul 10, 2018, 11:32 PM
Registered User
Quote:
Originally Posted by balsa or carbon
Yes , with enough speed . It may be very difficult to get enough speed at launching , perhaps a catapult launcher would help .

But my biggest concern with trying to make a hotliner out of a chuck glider would be the strength of the styrofoam airframe .
Thanks for reply, but I said that in a recent post it is reinforced with carbon spars all throughout wing and body. If you go look at ramy rc video of LIDL glider it goes pretty fast and is foam. Im looking for just some speed and fun with foam. Im sure it will hold up.
Jul 10, 2018, 11:58 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Quote:
Originally Posted by brymck1901
Thanks for reply, but I said that in a recent post it is reinforced with carbon spars all throughout wing and body. If you go look at ramy rc video of LIDL glider it goes pretty fast and is foam. Im looking for just some speed and fun with foam. Im sure it will hold up.
Let us know how it turns out , with video if possible !
Jul 11, 2018, 12:03 AM
Registered User

Final thoughts


I feel that I should go with the lighter 2845 3100kv. Please change my mind but for now I am leaning towards the 2845.

What would be the advantages of the 540 over the 2845?

Also what is a fast motor that can spin a 6x4 prop at 3s?


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