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HomeAircraftHelicopterMain Discussion › raptor v1 30 size conversion to electric flight time ??
10-30-2017 03:30 PM  8 months agoPost 21
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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yes, life would be much easier with a 6mm shaft motor. The link you posted is the very one I am using. I did have to machine the hole in the fan hub to accept the 6mm shaft as it was slightly smaller in diameter.

Watch at YouTube

drive a rotary, fly a rotorcraft

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10-30-2017 04:59 PM  8 months agoPost 22
gologo

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Sedalia, Mo USA

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^^^^^^ very nice Emile!! Love the MDs...and that smoooooooth flying.

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10-30-2017 09:36 PM  8 months agoPost 23
dave evo

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north west uk

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i agree lovely looking heli that and your flying puts mine to shame ..

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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10-30-2017 10:03 PM  8 months agoPost 24
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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thanks guys, I appreciate that. I still have more to do to it before its finished

drive a rotary, fly a rotorcraft

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10-31-2017 09:46 AM  8 months agoPost 25
dave evo

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north west uk

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Have you any experience of these motors ?

https://rover.ebay.com/rover/0/0/0?...%2F272524813889

https://rover.ebay.com/rover/0/0/0?...%2F272572143157

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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10-31-2017 09:33 PM  8 months agoPost 26
Heli143

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Phenix City, Alabama

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I believe GARRT is the maker of clone rs of the Trex models. I have a 500 size and it is a good quality. I've never used their engines so can't comment on them except to say they'd probably be good for a sport flyer without 3D.

if you have decided to just buy a 1200kv motor to start with PM me your address and I will send you a Trex 600 motor no charge.

Roy Mayoral

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11-01-2017 05:49 PM  8 months agoPost 27
dave evo

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north west uk

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wow that is so generous thank you , only problem is im in the uk so post would be a kiiler . thanks loads tho top man ;=)

dave

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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11-07-2017 07:48 PM  8 months agoPost 28
dave evo

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north west uk

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ok guys looks like im set on this motor and esc ,are they compatible ?

https://hobbyking.com/en_us/turnigy...?___store=en_us

https://www.ebay.co.uk/itm/201367750747

cheers

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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11-09-2017 05:01 PM  8 months agoPost 29
dave evo

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north west uk

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Bump
Bump

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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11-09-2017 08:21 PM  8 months agoPost 30
Heli143

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Phenix City, Alabama

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Hi Dave,
Emile and I were working on one of my raptors yesterday and found several things.
First of all I want to advise that we are using the stock gearing on this raptor...
We are using a CC HV 80 esc which is a favorite of mine for these smaller sport fliers.
We installed a 700~ Kv motor.
When hovering we found that the head speed was higher than desired
We adjusted the percentage on the controller and to get the right head speed we were down to 35 0/0 which is not good.

We determined that we need a motor on the 550 range and that the last raptor we did had a 575 KV motor and it flies great using stock gearing. We are in the process of install another motor now.

Roy Mayoral

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11-09-2017 08:39 PM  8 months agoPost 31
dave evo

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north west uk

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thanks roy so that motor in my links is too big then?

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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11-09-2017 08:54 PM  8 months agoPost 32
Heli143

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Phenix City, Alabama

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Yes. When you buy these Helis like the trex600 they are geared for those align motors with a higher Kv. I forgot to take into account the raptor stock gearing. The 575kv motors worked great in the raptor with stock gearing.
When building up an electric heli gearing is a factor. But with my raptors I just left the gearing stock.
My buddy Jay (LT1pwr) has a raptor with a 575kv motor on stock gearing and it flew great in pod and boom. He then installed it in a Hughes 500 fuselage and it still flies great.

Roy Mayoral

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11-10-2017 01:39 PM  8 months agoPost 33
lt1pwr

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Douglasville, GA

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Yes indeed!! I love my MD500 with the Raptor in it. Flies great on a 5000MAH 6S pack

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11-10-2017 02:29 PM  8 months agoPost 34
dave evo

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north west uk

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it1pwr that looks great, what set up do you run please ,i presume your md is a rappy 50 ?

im still confused about all the numbers etc when looking at electric components , is the kv rating on motors the speed /torque ie would a 500kv run slower but have more power than a 1500kv motor ? and then there are some motors out there with lower kv rating as in previous post but im not sure if thats all i have to look for ?? im going crazy with number in my head and then there is esc and battery selection lol..

thanks for your patience guys im learning slowly ..

dave

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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11-10-2017 05:01 PM  8 months agoPost 35
Heli143

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Phenix City, Alabama

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Dave that raptor used to be mine and unless Jay changed something it is setup with a 575kv motor, CC HV 80 to running a 6S battery.
The 500 Emile has used to be mine also and now I regret Emile having it. He has done a lot of work to it and is making it more scale like. It looks really good. As for his flying it is awesome. Like Stan said once Emile can make a brick fly LOL

Roy Mayoral

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11-10-2017 05:07 PM  8 months agoPost 36
Heli143

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Phenix City, Alabama

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One more thing Dave; regarding your comment about all the numbers being confusing... I’m still learning myself so I lean on Emile and others to help me out. If you google for 500 size scale Hueys or other 500 size scale builds you can read their build threads and learn what they are using and doing. There is a lot of info out there. For my 600 size huey I went to the YouTube videos of Krumkick2 who is an awesome builder of smaller scale helis. He built the same huey I’m working on so I learned a lot on how to build
mine.

Roy Mayoral

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11-10-2017 05:12 PM  8 months agoPost 37
dave evo

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north west uk

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Super ,thanks Roy I will check it out

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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11-10-2017 05:48 PM  8 months agoPost 38
lt1pwr

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Douglasville, GA

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Hi Dave,

Thanks for the compliment! You are correct that is a Raptor 50 with an electric conversion both Emile and Roy set up for me. It has a 575kv motor on stock gearing and I use a Castle 80HV ESC in non-governor mode. The ESC runs at 91% and that seems to be the magic number as it allows for a safe 7 minute flight and upon landing, the battery, ESC and motor are barely warm.

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11-10-2017 05:52 PM  8 months agoPost 39
Pistol Pete

rrProfessor

Seffner, FL

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Crunching the Numbers
dave evo
im still confused about all the numbers etc when looking at electric components
Given you are already being helped by folks with successful conversion, probably best to emulate what they have done. For what I have read, you dont want to use the clutch. That said, below what you need to come up with your wants and needs and perhaps I can shine some light down your path.

* MOTOR Kv rating is its RPM rotational speed per volt applied.

So we multiply the motor Kv by battery NOMINAL voltage which is 3.7V per cell. Why? Because if we use the max voltage of 4.2V per cell, as the battery voltage drops, so will the head speed.

So lets use one of your posted links...the Turnigy 670Kv equivalent to a .46 glow engine where:

For a 90% motor efficiency we use .9
For a 85% motor efficiency we use .85
For a 6S battery we use 22.2V (3.7 × 6 = 22.2)

* RPM = Motor Kv × Voltage × Percentage Motor Efficiency
RPM = 670 × 22.2 × .9
RPM = 13,386

Next we move unto calculating Gear Ratio.
Yes, its posted on manual but here's the formula:

* GEAR RATIO = Main Gear ÷ Pinion
GR = 86 ÷ 9
GR = 9.55

Finally we can calculate Head Speed where:
* Head Speed = RPM ÷ GR
HS = 13,386 ÷ 9.55
HS = 1,401 RPM

Another way to figure head speed:
((Kv × 3.7V per cell) ÷ (MG ÷ Pn)) × % efficiency

Best of luck!

EDITED
*ESC
Get one with helicopter settings since it has slow spool up as well as governor settings and given you dont want to use clutch.

~~Enjoying the hobby one flight at a time~~

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11-10-2017 06:01 PM  8 months agoPost 40
dave evo

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north west uk

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Pistol Pete you are a scientist obviously lol I want to maintain the clutch if I can but if it has to go it has to go I guess. Thanks guys

aeroplanes fly gracefully,helicopters just beat physics to death ;-)

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HomeAircraftHelicopterMain Discussion › raptor v1 30 size conversion to electric flight time ??
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