Help needed for large RC helicopter.
Dennis Fetters
We have lot's of experience building full size helicopters, but little
knowledge in the RC field and what's available.
I have been contracted to provide a customer with two large (400 pounds
empty) prototype helicopters to be flown by remote control. It is a CCPM
controlled configuration. I need to find servo's that are large enough
to handle at least a 5 pound resistance per arm, with a 3" travel.
The control rods go through the center of the drive shaft and connect to
the control gimble below the transmission, where 3 arms are located for
both cyclic and collective inputs for the CCPM configuration. The best
solution would be 3 linear servo's, if something preexists.
Rather than reinvent the wheel, I hope someone would be kind enough to
provide me information on where to find servo's large enough to do the
job, or if a linear servo can be used. The response time of these large
helicopters are much less than that of an RC model.
Also, if someone of high experience in RC helicopters is interested in
providing some help with the flights, we're located in the California LA
area.
Sincerely,
Dennis
Roger N
I don't know of any model servos I would trust to fly a 400lb heli. You
could do something similar to what the giant scale airplane modelers do, run
multiple servos per channel. R/C servos have specs in ounce inches and a
certain number of degrees of rotation. If you sized a pinion to give you
the correct thrust, and then used enough servo's to give 3" of throw, you
could use an array of R/C servo's in a rack and pinion arrangement to give
you the thrust and stroke you need. For example, 2 servo's, each supplying
1/2 the throw at 5+ lbs thrust.
This sounds like an interesting project, let me know if you are sending any
of the electronic or machine work out. I have a machine shop in my garage
including a CNC Bridgeport Mill and CAD/CAM software that will let me cut
parts from your CAD drawings. I also do electronic/electrical work where I
could help out with power distribution to a receiver and multiple servo's so
that the servo power would not be pulled through the receiver. Also you may
need isolation and/or amplification to get the servo signal to multiple
servo's at distances greater than R/C models have. I have worked a lot with
industrial servos and know how they get their instrumentation signals to run
next to PWM power cables without interference.
I do work full time + so I would be limited in the amount of time I could
put into side projects, but this sounds interesting and I'd be interested in
doing what I could to help.
"Dennis Fetters" <fetters...@sbcglobal.net> wrote in message
news:3E39731E...@sbcglobal.net...
Peter Christy
somewhat like a car bottle jack. I believe they use a 540 style industrial
electric motor in the "bottle". The Yamaha is quite a big machine powered
(from memory) by a liquid-cooled motorcycle engine, so the servos should be
man enough for your machine.
All the radio gear in the one I got a close look at was made by Futaba. I know
they don't export the helicopters - and I certainly haven't seen these servos
generally for sale - but it might be worth contacting Futaba Japan direct.
Alternatively, although the heli is badged as a Yamaha product, they are
actually made by Hirobo. They may be able to assist.
--
Pete
chr...@attglobal.net
Beav
>
> We have lot's of experience building full size helicopters, but little
> knowledge in the RC field and what's available.
>
> I have been contracted to provide a customer with two large (400 pounds
> empty) prototype helicopters to be flown by remote control.
Hey Mohamed, why not flog 'em a couple of your WONDERFUL Mini's?
It is a CCPM
> controlled configuration. I need to find servo's that are large enough
> to handle at least a 5 pound resistance per arm, with a 3" travel.
Ask Joe Rinke, he's a pal of yours isn't he?
>
> The control rods go through the center of the drive shaft and connect to
> the control gimble below the transmission, where 3 arms are located for
> both cyclic and collective inputs for the CCPM configuration. The best
> solution would be 3 linear servo's, if something preexists.
>
> Rather than reinvent the wheel, I hope someone would be kind enough to
> provide me information on where to find servo's large enough to do the
> job, or if a linear servo can be used. The response time of these large
> helicopters are much less than that of an RC model.
>
> Also, if someone of high experience in RC helicopters is interested in
> providing some help with the flights, we're located in the California LA
> area.
For how long?
Beav
Louie Sanders
Dennis,
I don't know much about remote controlled helicopters, however I would
be interested in watching you construct RC helicopters of this
magnitude. When you figure out how it's going to be done, I would
like to take a look at them during construction if possible. I live
in the LA area, so I'm local.
Sincerely,
Louie
Beav
"Louie Sanders" <Jlo...@aol.com> wrote in message
news:67ce960.03020...@posting.google.com...
What *I'D* like to see is Fetters himself actualy come up with an idea of
his own in relation to a helicopter insread of trying to get some other
bugger to come up with one FOR him, and when he was selling "full sized"
(homebuilt) heli's, you'd have been lucky to get to see one of THEM before
your money was safely out of your care so I don't fancy your chances of
looking at one of his latest "projects".
This guy is the type who, before he'd even speak to you on the phone, would
charge a fee you if you bought one of his death trap heli's from someone
ELSE (about 750 dollars IIRC)
--
Beav
Please note my E-mail address is "beavis dot original at ntlworld dot com"
(with the obvious changes)
Beavisland now lives at
www.beavisoriginal.co.uk
herawan
Hi guys,
i dont have any experience in RC helicopter, but my cousin birthday
is coming up in a month so i need all the help i can get and he is a RC
helicopter freak.
Im intending to buy a -*Hirobo SST eagle 3 type 90 * - and -*Servo Gyro
with 2 blade and the engine is 90*.- i dont know what that mean but i
found it on my cousin "things that he really want" list. so me and my
other cousins and family decided to get the things he really wants.
im in california LA, if you guys know any shop that might have them or
any link website is appriciated.
Please reply to h3r...@hotmail.com... Thank you for any advice or
suggestion given. :)
--
herawan
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peecao
I can make you a custom servo with any specs at your regard!
email me
pee...@yahoo.com
--
peecao
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Tip
> Dennis Fetters Wrote:
>> Hello,
Hello, PLANEMAN.
>> We have lot's of experience building full size helicopters, but little
>> knowledge in the RC field and what's available.
And little knowledge in the full size helicopter field.
>> I have been contracted to provide a customer with two large (400
>> pounds
>> empty) prototype helicopters to be flown by remote control. It is a
>> CCPM
>> controlled configuration. I need to find servo's that are large enough
>> to handle at least a 5 pound resistance per arm, with a 3" travel.
>>
>> The control rods go through the center of the drive shaft and connect
>> to
>> the control gimble below the transmission, where 3 arms are located
>> for
>> both cyclic and collective inputs
Of course, Augusto Cicare's helicopter again.
>> for the CCPM configuration. The best solution would be 3 linear servo's, if something preexists.
>>
>> Rather than reinvent the wheel, I hope someone would be kind enough to
>> provide me information on where to find servo's large enough to do the
>> job, or if a linear servo can be used. The response time of these
>> large
>> helicopters are much less than that of an RC model.
Less, huh?
>> Also, if someone of high experience in RC helicopters is interested in
>> providing some help with the flights, we're located in the California
>> LA
>> area.
>>
>> Sincerely,
>>
>> Dennis
> Your servos are easy to make and don't need any astrophysics.
>
> I can make you a custom servo with any specs at your regard!
Get the cash first.
> email me
> pee...@yahoo.com
KAO
cyhyam
The heli was completed and flown in 2007
http://www.youtube.com/watch?v=c46N72STk4w
--
cyhyam
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