Helicopter mess up

My work space got moved! Mary got fed up with walking past my old work space to the front door!
I now can't find anything! Worst still a number of old transmitters got sent to the SPCA but she kept the ones she thought were relevant! This helicopter has never been flown.
Port and starboard views, it's obviously 35meg and its receiver obviously has 3 small ESCs in it for the can motors. Does anyone have any idea of how to hook it up to a mainstream transmitter (I have a variety) The TXs that were saved are no match at all. I seem to remember the correct TX having some kind of rotating knob on the face for left/right trim.
Bin it is also an option but it goes very much against the grain to bin something that's never flown.

Ah, those old contra-rotor toys,
Are you sure it is on 35, and not 27? (or some other weird illegal band?) The antenna is about the same length for both.
-
You will find that the tail rotor is controlled by the elevator stick, for pitch control. (Forward stick lifts the tail for forward fRight) ((that's not a typo!))
Yaw will be on the rudder stick, as you'd expect, but it works by varying the speed of one of the rotors, so you get a torque turn.
The throttle controls the speed of both rotors together - and therefore the height.
When trimmed out, in still air, it will just sit there doing nothing. Try to get that set up before you start hitting the walls with it!
-
It will be a strictly indoors or flat calm outdoors model - any breeze, and it will just blow away!
They are fairly bounceable, but once you break it, if you can't repair it, you'll be lucky to find any spares!

Thanks Simon, I haven't looked as yet, it would require major dismantling but I don't think there's a gyro.

Exactly right Eric, it's on 27Mhz, I've found a label under the tail. I'm wondering if the receiver can be back engineered, ie, remove the 27meg + servo decoding and replace the whole lot with 35meg, using just the 3 ESC to drive the motors.

I forgot to add, until I saw Simon's comment -
There will be no 3 axis gyro - due to the 'design'?? they are self-stabilizing, with the very high centre of lift vs mass - like a pendulum.
-
I can't say if it can be back-engineered to three esc's and a 35 Mhz rx, as the motor controls are built-in to the rx, and there may not be room - and maybe lifting capacity! - - assuming you can FIND three 3v esc's!
Is it worth the effort, other than a self-satisfying challenge?

Thanks for the caveat Eric, I was thinking along the lines of using the existing board, removing the 27meg stuff (it's heavier than the 2.4gig stuff we use today) and using an sbus RX with a 4 channel decoder (the XM receiver and decoder have already been discussed on this site) and wiring the pwm signals to the inputs of the remaining ESCs.

Hmm, not going to happen Simon, brushed ESCs are about as common as Rocking horse manure and I don't think these motors will draw much more than about 2amps apiece. I may just strip it for parts that I will probably never use.

Borrowed a kiddies toy one (that I had previously repaired - tree damage!) - to double-check.
The flybar leads the top rotor by about 40' - and alters the pitch of the top blades, which are fixed together, such that as one goes pos, the other goes neg.
So the flybar acts like a flywheel, countering any movement of the entire heli, and restores it to stability when pitch stops over-riding it.
The lower rotor is fixed pitch, with limited tilt fore/aft and port/starboard, on this sample, which does NOT have a tail rotor in either plane, just a fixed vertical fin on a short boom. (E-flight Blade mcx).

Good one Eric, gives me something to go on.