RCU Forums - View Single Post - Differential thrust question
View Single Post
Old 04-26-2007 | 04:40 PM
  #2  
bigR
My Feedback: (2)
 
Joined: Aug 2003
Posts: 57
Likes: 0
Received 0 Likes on 0 Posts
From: Granada hills, CA
Default RE: Differential thrust question

Hi,

Yes, there is a cheap and effective mixer you can use. Go to Tower Hobbies and order a Slinger elevon mixer. I just checked and it is $11.49. I used it on my Pink Peril test plane.

They don't mention any adjustments but there are pots on the circuit board. If you cut open the shrink-wrap you can adjust it so that you will have full throttle on both motors at full up left stick. When you move the rudder it will throttle back the inside motor and speed up the outside motor at anything less than full throttle. If you don't adjust the pots both motors will go to about 3/4th speed at full stick; in other words you will not have full power.

At idle both motors are off on center stick. If you move the rudder one motor will throttle up, which I think is a safety issue. I bought a JR7202 and programmed it to mix the inside motor down when the rudder was moved but not speed up the outside motor. You can't do that with a simple mixer but it's cheaper than a new radio.

BTW, I switched the red and black power wires on the connectors so I could use the mixer with my old style reverse wired Airtronics receiver.

Does the differential throttle work? YES. I wanted to save weight on my Emily so I left off the water rudder. You can see how effective the differential steering was by going to rcgroups-electric plane video forums and scroll down to "Emily taxi tests." I don't have flight video yet, film is still in the camera so to speak but the steering was very effective on the pond.


John in Kalifornia
Attached Thumbnails Click image for larger version

Name:	Qo39385.jpg
Views:	57
Size:	8.9 KB
ID:	672823   Click image for larger version

Name:	Fa87401.jpg
Views:	55
Size:	46.5 KB
ID:	672824