<span style="font-family: Comic Sans MS"><span style="font-size: larger">hello all
Please can you help, i'm mew to the world of rc plane building, i have got my son the new tutor two for christmas along with the new futaba 4yf radio the radio is not supplied with survos, what i need to know is, i have four sanwah servos from a old trainer i had some years ago is there any way i can modify them to fit the futaba recever, i would be greatfull for any help that can be offerd. regards billbo</span></span>

I am not familiar with Sanwah servos. But all you need is standard servos and those are cheap

If the servos will plug into the receiver you can try them to see if they work.

If they won't plug into the receiver, you obviously would have to replace the plugs - and then you only have a chance they will work.

For only a little more than the price of replacing the plugs, you can probably get new servos that WILL work.

I can't find any info on the Tutor Two, but if you can provide a link to it, we could recommend some inexpensive servos

If these are the old Airtronics (I think that is the Sanwa type) with the ribbed and rather thick shell as compared to modern connectors, you should not plug them in as the servos will be reverse biased and will burn out in seconds. If the red lead is not in the center of the plug, do not use them. However, you can rewire the connector so that they can be used by interchanging the two power leads, usually the red and the black leads. Some of these old servos had two black leads so you have to find which one is the signal lead and which is the ground or negative lead then reverse the red and the negative wires in the connector to use them with a modern receiver.

Here is a chart that will show you want the above members are talking about. If you have old Sanwa servos they were sold here in theUSunder the name Sanwa but were sold with Airtronics radios. Later they were sold under the label of Airtronics. If the connectors have the 3 splines on them you can convert them for use with your Futaba radio with a little work.First, you will need to rewire the connectors. The old Airtronics servos had the positive on the outside of the connector while the rest of the world had the positive on the middle connector (see the chart). Unfortunately the old wires used weren't red and black, but instead they are all black, but the positive wire will have a white stripe on it. What you will need to do is use the point of an X-acto knive or a small jewelers screwdriver to lift the small tab on each wire of the connector. Pull out both the positive wire (with the white stripe) and the middle wire and switch them. Now that the servo is rewired for use with the Futaba radio you can shave off the splines on the connector. Once you have those shaved off you can now plug in the servo to the Futaba receiver. Just be advised is there is now nothing that will prevent you from plugging it in backwards. As you plug them in you will need to ensure they are plugged in properly. An easy way to ensure this is to plug in the battery (which should have a tab on it to prevent plugging it in backwards) and this will show you where the negative leads on the receiver are. Plug your servos in with the negative wires in the same position as the battery and you'll be fine.

Ken