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HomeScaleAircraftHelicopterScale Model RC Helicopters › Bell 47 Electric Conversion
01-30-2012 10:33 AM  6 years agoPost 1
Christopher B

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Tring, England

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Hi Guys What do you think of my conversion of the century Bell 47 to electric?
It uses a 6s Lipo 100A speedo (a bit over the top but its what i had spare) Just made up a mount and used a prop adaptor on to the original clutch and gears. Scorpion motor (had to shorten the shaft) and it flys beautifully.
The colour scheme is from the Blue Eagles helicopter display team from the 1970s. (just need to get some decals for the tanks etc).

Video to follow..

Cheers
Chris

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01-30-2012 10:53 AM  6 years agoPost 2
dgoss999

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UK - Lancashire

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Can't see the conversion - Nice flying field though!!

/DG

"Believe none of what you hear, and only half of what you see." • Benjamin Franklin

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01-30-2012 02:09 PM  6 years agoPost 3
Christopher B

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Tring, England

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not a lot to see i'm afraid. Battery under the canopy at the front, the motor is a lot smaller than a 50 and there is no tank at the back any more. Also dont have any ballance problems.

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01-30-2012 02:25 PM  6 years agoPost 4
dgoss999

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UK - Lancashire

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Hi Chris..

Which Century B47 was this one.. I have only seen the Century one built around the Hawk Mechanics??

/David.

"Believe none of what you hear, and only half of what you see." • Benjamin Franklin

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01-30-2012 02:36 PM  6 years agoPost 5
Christopher BrrNovice - Tring, England - My Posts: All  Forum  Topic

Sorry you are right its the Hawk mechanics Just got the raven in my head for some reason.

Here is the video.

Watch at YouTube

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01-30-2012 03:13 PM  6 years agoPost 6
Jockobadger

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Snoqualmie, Washington USA

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Hi Christopher - Looks great! I have the same heli - painted SAC Green - looks a bit like the old MASH vers. What KV is the motor? Thanks for posting.

Century Bell 47 III, RCA,700 UH-1N, Hirobo Lama, Logo 500, Logo 400, Trex 550e, HC3SX, Kontronic

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01-30-2012 04:10 PM  6 years agoPost 7
Christopher B

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Tring, England

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hi Jockobadger Thanks.

The motor is a 910 KV and i am using the original clutch and gearing with 6 cells I think the gear ratio is about 10.6:1 so the max head speed is around 1900 but obviously its throttled right back to around 1500-1600 (havent tachoed it yet but its a lot slower than my Trex 600 was which i ran at 1950.)

Still getting used to it but i am getting about 8 mins from a 5000 Mah pack but only putting back a little over 3200 Mah so 10 min flight should be no problem at all.

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01-30-2012 05:18 PM  6 years agoPost 8
Mojave

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Palos Verdes, Ca. USA

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Looks great! I like the way you painted the frames to match the fuse. Only thing I would do is build a simple battery tray for that lipo. It's a lot of weight just hanging off a velcro strap.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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01-30-2012 05:56 PM  6 years agoPost 9
Christopher B

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Tring, England

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Good idea about the tray but I want to remove the battey without removing the Bubble canopy.
It is actually velcroed for most of the top of the battery to the radio Chassis as well as the strap and actually take quite a lot of force to remove with the strap released. This is held on more securely than my old Trex 600 was and that was doing 3D so should be fine for scale flying. But thanks for checking.

Might add a second strap just in case.

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01-30-2012 07:13 PM  6 years agoPost 10
skypup

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San Antonio, Texas

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Christopher, nice job. Mine is almost done. How much did you need to trim off the back of the canopy for pushrod clearance? It looks like I would need to cut beyond the colored portion of the canopy at the rear to get the needed aileron pushrod clearance. It was fine before installing the controls. Thanks.

SKYPUP

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01-30-2012 08:10 PM  6 years agoPost 11
Mojave

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Palos Verdes, Ca. USA

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Gotcha, if it works, leave it be. Did you put fuel tank rubber on the front of the frame rails? That will keep them from rubbing the lipo. It's cheap insurance against a lipo fire. With my R22 the lipo just pops right out through the pilots window, so I don't have to remove the fuse to change it out.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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01-30-2012 09:19 PM  6 years agoPost 12
Christopher B

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Tring, England

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Skypup.
I have only had to cut away a small part of the returned edge on mine but it is close, I think your servo may be a little bit taller than mine (hitech 635)or you are using holes further out on the arms i wouldnt expect too much trimming though. (Except if you put the battery under the cabin floor like mine then you will need to trim about an inch further back following existing cutout)

Mojave.
Nice tip about the fuel tube on the frame rails fortunately my battery is a bit further forward and cant contact them. the only contact point is the plate under the radio tray where the velcro is attacthed.

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01-31-2012 12:01 AM  6 years agoPost 13
skypup

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San Antonio, Texas

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Thanks

Must be my servo height.

SKYPUP

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01-31-2012 01:05 AM  6 years agoPost 14
Mojave

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Palos Verdes, Ca. USA

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Cool. In the pics it looked like it was on the edge of the frames. I was originally going to mount my lipo there, before I made the lipo mount.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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