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Jan 09, 2019, 12:09 AM
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Mini-Review

FMS 50mm EDF




Sent for review testing by FastTech.com ( Product Page )

I came home after my morning walk and there was a box waiting for me .

Inside was a 50mm FMS EDF ..
The bullet connectors were pre soldered so all I needed to do to run some current measurements was connect a ESC .

2s = The EDF pulled 11.5 amp from a 2200 2s battery pack

3s = The EDF pulled 19.5 amp from a 2200 3s battery pack

Now I have to say that the motor did run smooth out of the box .
On the 2s there was some useful thrust , how much ?
How ever on the 3s it was just crazy .. At full power the thrust is just simply impressive as is the noise this EDF makes .. ( Be loud )
This 50mm will go into a HK Prime Jet pro , and I will try both 2s and 3s batteries ..
3s will definitely power the Prime , and I think that 2s will do just fine ( I think ) , just have to see how heavy the prime turns out ..

Now if you read the speel on this motor , it is supposed to be 3s - 4s ....
On 4s this EDF would be insane , and I am not sure you would want to go there (?) .. That 4500kv motor is already howling on 3s ...
So from here on the FMS 50mm 4500kv EDF is partnering with the Prime Jet pro ...
This be only the first post on this project ..

Thank you Fasttech.com , hopefully we will have some flying video's to view not to far into the future .

FMS 50mm EDF (2 min 33 sec)
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Apr 12, 2019, 04:43 PM
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Originally Posted by old4570 View Post

Now if you read the speel on this motor , it is supposed to be 3s - 4s ....
On 4s this EDF would be insane , and I am not sure you would want to go there (?) .. That 4500kv motor is already howling on 3s ...
Hi Old4570,

i think that your 4500kv version is primary for use with the 4s battery.
For the 3s is a 5400kv version.
Last edited by Deadguy; Apr 12, 2019 at 04:54 PM.
Apr 12, 2019, 05:49 PM
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That 5400KV might be even better on 2s
Apr 12, 2019, 11:51 PM
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That 5400KV might be even better on 2s
I have the 5400kv in the Alfamodel Sabre. Not fly her yet. Ok, I will try both 3 & 2 S. I wonder if it will work on 2s. It will be great for the AUW.
Apr 13, 2019, 03:13 AM
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I find there is decent thrust on 2s , especially if your air frame is not overly heavy .
Jan 06, 2020, 10:04 AM
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hi everyone!

I'm interested in this EDF for a 4-EDF commercial airplane..

Did someone of you some test about lipos/amps and thrust?

your support is ery appreciated.

cheers
Jul 22, 2020, 07:44 PM
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I just bought this motor. How do you go about attaching the duct to the front of the motor? Do you just CA it? Mine is really loose. I thought it would probably click in place but nada.
Jul 22, 2020, 09:12 PM
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Yeah , CA should work just fine .
Jul 22, 2020, 09:14 PM
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Yeah , CA should work just fine .
Thanks.
Dec 23, 2020, 09:40 AM
Youtube channel : solentlifeuk
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Fitted the 3S 5400kv version to a model .... thrust is moderate - ~500gr ...... not exactly adrenaline stuff.

I tested alongside a Haoye 50mm 6 blade with 5000kv and the Haoye easily beat it. Not only that but run time is slightly better.

FMS dragged 31A WOT .......... the Haoye 26A

Of course the FMS has a better sound - but for me ? I need thrust.

FMS quote 650gr thrust ..... maybe free of any model frame ... but not in a model.

Would be interested to hear others results ...
Dec 23, 2020, 04:32 PM
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Prime Jet Pro less the canard (2 min 27 sec)


2s Battery ..
This has been on the back burner for a long time ... It has the 50mm EDF in it ..
Lacks power on 2s , flies , but lacks power .
I will move up to 3s power ASAP .. Just need to do some CG checks and relocate the 3s battery pack . The Canard was getting in the way of trimming - so it had to go .
Pulls 14A I think on 2s
Dec 24, 2020, 04:37 AM
Youtube channel : solentlifeuk
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Not surprised as EDF are notorious for power demand.

In the years of using EDF's - I've literally found that what factory quotes is about 30% overstated on thrust ..... and to get anywhere near their claims - +1 cell on the battery !!

Dr Mad Thrust 3S as example ....... twin in my Concorde should have been ballistic according to HK. But in fact she was losing altitude in turns ... in fact did her own 'touch and go' as barely able to maintain height.
With 4S in - she came alive ......
Dec 24, 2020, 08:56 PM
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I tested on the smaller 3s pack ..
22A @ full throttle , enough thrust that the model pulled out of my hand the first time . Took me by surprise . I have checked the CG and will slowly move the battery back as I fly . Got to find the G-spot ! ( Gravy Spot ) . Really looking forward to a 3s flight .


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