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HelicopterScale Model RC Helicopters › Total Transformation
10-02-2017 10:52 PM  75 days agoPost 1
Copter Doctor

rrProfessor

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

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Took a raptor 50 and did some mods to put it n an MD500 fuselage. the plan, remove the front servo tray and part of the main frames to allow for a full cockpit and also convert the control system from mechanical single servo ccpm to 120 degree ccpm so as to allow for easy installation and phasing of a five bladed head.
I felt like a surgeon operating on the six million dollar man.

drive a rotary, fly a rotorcraft

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10-02-2017 10:54 PM  75 days agoPost 2
co_rotorhead

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Centennial, CO, USA

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That's awesome Emile. Are you using the stock clutch bell and pinion?

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10-02-2017 11:08 PM  75 days agoPost 3
Copter Doctor

rrProfessor

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

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Thanks and yes I am, I am running 6 cells with a CC 100 amp esc and a 670 kv motor running a nice moderate headspeed. So far the mechs are flying very well and will start sizing things up in the fuse after a few more flights.

drive a rotary, fly a rotorcraft

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10-02-2017 11:11 PM  75 days agoPost 4
co_rotorhead

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Centennial, CO, USA

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Very cool. I have a couple old Raptor 50s lying around. I've often thought about what it would take to convert to electric and keep the clutch.

Any difficulties mounting the 2 front servos (aileron and pitch)?

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10-02-2017 11:33 PM  75 days agoPost 5
Copter Doctor

rrProfessor

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

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I made my own motor mount using aluminum 90 degree channels from lowes. I extended the 6mm shaft on themotor to reach all the waythru the hub and into the clutch's one way bearing 2/3 of the way. the last 14 of the way thru is where the start shaft sits (I grinded it down a few mm to keep things fitting correctly. I did bore the hole in the fan hub out to 6mm so the shaft passes thru it.

drive a rotary, fly a rotorcraft

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10-03-2017 12:35 AM  75 days agoPost 6
ssmith512

rrKey Veteran

Indianapolis, IN USA

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Mutilation? I prefer the term transformation! Anyone can mutilate, only super talented people like you can perform transformations!

Steve

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10-03-2017 01:06 AM  75 days agoPost 7
chopper37

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NJ and Long Island

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This should open some doors to folks owning a raptor looking into scale, well done

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10-03-2017 01:07 AM  75 days agoPost 8
Mojave

rrElite Veteran

Palos Verdes, Ca. USA

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That's what we call thinking outside the box... Just about anything can be accomplished with enough ingenuity.
Barry

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

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10-03-2017 01:28 AM  75 days agoPost 9
chopper37

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NJ and Long Island

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That's what we call thinking outside the box... Just about anything can be accomplished with enough ingenuity
Exactly!!

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10-03-2017 01:35 AM  75 days agoPost 10
Copter Doctor

rrProfessor

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

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Thanks Steve and the rest of you guys,Steve i think you are right, transformation is a better term.
well I tried doing a five bladed head on a raptor once and it was a set up nightmare. hard to phase because the required "twist" angle of the links was too much. too many pc links and a swash driver sharing 360 degrees of space and pc links were hitting the driver and that's no good. then I tried mixing ail and elev to get the 45 offset inn the swash and that works but if you have to trim the cyclic controls, you have to trim both elev and ail to get it to work in the direction you need (after you figure out which trims and in what direction) or use a stab with with adjustable phasing.
relocating the servos made for a little trickery but the hacksaw made things fall into place literally

drive a rotary, fly a rotorcraft

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10-03-2017 01:39 AM  75 days agoPost 11
co_rotorhead

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Centennial, CO, USA

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Hey Emile -- when you get a chance, can you post a pic of how you mounted the aileron and pitch servos up front? Much appreciated.

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10-03-2017 02:02 AM  74 days agoPost 12
Copter Doctor

rrProfessor

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

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here ya are!
I use goop to secure the servo in position and a tie wrap to give the added security by drilling holes in the side frames so the tie wrap can go through and around. Now you may question goop but if you have ever tried to remove something you glued in place with goop you would know its not going anywhere. This has been a proven method on many of my scalers for years.
I just hope I never need to replace a servo any time soon.
I did have to cut away a few of the reinforcement fins in the frame to provide a nice flat surface to glue the servo.

drive a rotary, fly a rotorcraft

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10-03-2017 02:10 AM  74 days agoPost 13
TailKiller

rrApprentice

Panama City, FL

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Awesome Emile!! Great talent man.. I thought Einstein was dead, apparently his soul lives on in Enterprise AL.

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

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10-03-2017 03:10 AM  74 days agoPost 14
co_rotorhead

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Centennial, CO, USA

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Thanks for the pics and details, Emile!

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10-03-2017 04:10 AM  74 days agoPost 15
co_rotorhead

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Centennial, CO, USA

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I extended the 6mm shaft on the motor to reach all the way thru the hub and into the clutch's one way bearing 2/3 of the way. the last 14 of the way thru is where the start shaft sits (I grinded it down a few mm to keep things fitting correctly. I did bore the hole in the fan hub out to 6mm so the shaft passes thru it.
So, dumb question... how does the hub stay attached to the motor shaft? Did you thread the shaft/hub so the hub screws on to the shaft and secure it with a nut? (like you would if you had a nitro engine in it?)

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10-03-2017 12:11 PM  74 days agoPost 16
Copter Doctor

rrProfessor

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

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In this case the hub acts more like a spacer. But you could drill and tap a hole in the side of the hub so a set screw can secure the hub to the shaft. Thats how ive done it in the past on raptor elec conversions.this time i tried something different since the motor i am using has a 6mm shaft. (in the past i used motors with a 5mm shaft) now the shaft drives the clutch using the one way brng in the center of the clutch the same way the start shaft does when used to start a nitro engine. I am also considering mounting one of those one way brngs in the fan hub. This will require boring the hub to accept that size brng.

drive a rotary, fly a rotorcraft

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10-03-2017 01:25 PM  74 days agoPost 17
co_rotorhead

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Centennial, CO, USA

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Thanks Emile. I figured that you may have been using the one-way bearing to drive the clutch -- just wanted to confirm.

I think I will use the set screw to fix the hub to the motor shaft as some extra insurance against a one-way bearing failure. (I assume that if the one-way bearing were to fail without the hub secured to shaft, it would be auto-rotation time, since the motor shaft would just be spinning inside the bearing and no longer driving the clutch)

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10-03-2017 02:11 PM  74 days agoPost 18
Copter Doctor

rrProfessor

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

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yes you are correct. perhaps I will do the same just in case. Next I am gonna whip up some tail rotor blades as the stock raptor blades aren't man enough for the job of counteracting the torque it takes to turn 5 blades

drive a rotary, fly a rotorcraft

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10-03-2017 02:26 PM  74 days agoPost 19
co_rotorhead

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Centennial, CO, USA

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I think you may be the most resourceful person I've ever met in this hobby, Emile.

You are correct about the stock tail blades. I have that same Century 5-blade rotor head on my AH-6. Even swinging 550mm mains, I still run 105s on the tail -- the stock 95s are not up to the task.

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10-03-2017 02:32 PM  74 days agoPost 20
CoachE

rrApprentice

Cincinnati, ohio -usa

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and that is why we call him the doctor......

Team JR / Get !T - Got !T - Perfect !T

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