Modified Guinea Pig, questions for the knowledgeable?

[Maxstudio]

Ok ,

Couple questions for those in the know.

First question. I went with differential thrust, little different set up then FT and this left me my gear servo open, so i'm going to use it for the cargo door mechanism. However, i have bomb drop planned for this plane (two "BIG boy" Nukes) and this means i'm out of channels on my 6 channel radio. I have another 4 channel radio and receiver. my question is how can i jack a second receiver into the same battery? is this a bad idea? this way i can operate my 6 channel as pilot/navigator and have a buddy operate the 4 channel as Flight engineer/load master/bombardier.

second question. I want to mount a camera on a servo so i can mount it in the cockpit and be able to turn the view from out front window to back into the cargo hold. Is there a way to get a full 180 degree rotation or more on a servo? I know I've seen some FPV with at least close to 360 degree's of rotation on a camera, but not sure what the setup was.

Thanks for any help!

 

[captron360]

Im fooling around with the servo/radio question. Here is the 360 degree servo video from Peter https://www.youtube.com/watch?v=XUm2nj7te8E
Happy Landings

 

[Hai-Lee]

For the bomb drop why don't you share the channel used for the cargo door.

If you set up the tx so that the door and bomb release operate via a 3 position switch assuming the cargo door does not cover the bomb bay.

Flick the switch one way and the door opens and the door closes when returned ot centre whilst the bombs are released when the switch is pushed down. Simple really yo could even use 2 servos (one for each function) connected via a "Y" harness to the same channel.

For the camera platform you could butcher a servo and have the gearing to the feedback pot reduced so that the feedback pot requires more output movement for each degree of feedback pot shaft movement.

Conversely you could again use a 3 position switch for a servo with a couple of switches set up so that the servo causes a brushed motor or the like to rotate in a direction selected by the servo via the switches, (the reverse rotation caused by reversing the battery supply to the "PAN" drive motor. Of course you would require some gearing down to the camera bed but otherwise it is quite simple.

Whilst the Pan function could be free to endlessly rotate a limit would need to be introduced so that the wires for the camera are not pulled out of the camera.

 

[Maxstudio]

For the bomb drop why don't you share the channel used for the cargo door.

If you set up the tx so that the door and bomb release operate via a 3 position switch assuming the cargo door does not cover the bomb bay.

Flick the switch one way and the door opens and the door closes when returned ot centre whilst the bombs are released when the switch is pushed down. Simple really yo could even use 2 servos (one for each function) connected via a "Y" harness to the same channel.

For the camera platform you could butcher a servo and have the gearing to the feedback pot reduced so that the feedback pot requires more output movement for each degree of feedback pot shaft movement.

Conversely you could again use a 3 position switch for a servo with a couple of switches set up so that the servo causes a brushed motor or the like to rotate in a direction selected by the servo via the switches, (the reverse rotation caused by reversing the battery supply to the "PAN" drive motor. Of course you would require some gearing down to the camera bed but otherwise it is quite simple.

Whilst the Pan function could be free to endlessly rotate a limit would need to be introduced so that the wires for the camera are not pulled out of the camera.

The bomb drop is set to a three position switch. middle position is locked, position 1 releases the left wing bomb and position 3 releases the right wing bomb. It's a simple set up with servo in middle of the wing. control rods out to each side, in neutral position both sides are held by the rod. when one is dropping the pin is simply pulled back on that side and pushed further through on the opposite side. if you can picture it. The rod acts as the pin holding the bomb up on the front end, the rear end is hooked on a wood dowel pin. so the bomb is loaded from the front onto rear hook over dowel and then pushed up and pinned by the control rod in front.

 

[Maxstudio]

Im fooling around with the servo/radio question. Here is the 360 degree servo video from Peter https://www.youtube.com/watch?v=XUm2nj7te8E
Happy Landings

That should do it, Thank you!

All i need now is to figure out how the easiest way would be to power the second receiver off the same power as first

 

[Hai-Lee]

You could if you wanted use the same centrally located servo to drop bombs at the same time if you used a straight through servo arm and fitted, (pointed towards the wing tips), and then connect the rods to the tips. Then regardless of the rotation direction both rods would be pulled and both bombs dropped together.

Again with a central servo and a straight through servo arm pointed fore and aft along the line of the fuselage servo rotation in one direction would release the bombs and in the other direction there would be no effect.

If you chose to drop both bombs together then you would not require another channel.

 

[Hai-Lee]

If your existing ESC can handle the current (3A BEC) then the second Rx could be powered by using a simple "Y" Harness with the signal pin removed on the second Rx, (Leave the red and black/brown wires attached).

 

[Maxstudio]

If your existing ESC can handle the current (3A BEC) then the second Rx could be powered by using a simple "Y" Harness with the signal pin removed on the second Rx, (Leave the red and black/brown wires attached).

I'll look into what A the BEC is on my ESC's....Thanks!

 

[JimCR120]

BEC is a battery eliminator circuit. It provides the 5VDC to the receiver and also cuts power to the motor when voltage drops too low while maintaining some reserve power for flight controls so you can glide your plane to the ground. Many multirotor ESC's do not have the BEC which is why you'll find only 2 wires going to the little servo type connector and why it will not power up a receiver.

 

[Hobbyflynation]

Possible for 3 channel guinea pig

I just built the guinea pig with no servos in it and I'm running short on servos. I was wondering if it's possible for a guinea pig with just rudder, elevator, and throttle? I don't feel comfortable with differential thrust considering I've never flown with differential thrust. So will it be possible and if so, what mods will I have to do?

 

[Maxstudio]

without ailerons you would need diherderal (SP) or you would have no way to level out. thou there is a lot of weight below the wings, not sure i'd try it, but might fly