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Old Apr 11, 2003, 02:16 AM
Will work for planes
omega blood's Avatar
Fullerton, California, United States
Joined Jan 2002
1,783 Posts
what's the difference between a buddy box and a trainer cord?

I would like to Know what the difference between a buddy box and a trainer cord? Also are there any web sites that have plans for a do it your self trainer cord for hitec?
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Old Apr 11, 2003, 02:19 AM
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flyfalcons's Avatar
Bonney Lake, WA
Joined Jan 2002
788 Posts
The trainer cord is what goes between the transmitters, and the buddy box is the second transmitter. At the current price of trainer cords I think it's best to just buy one.
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Old Apr 11, 2003, 06:22 AM
Turbines suck ;-)
Australia, QLD, Brisbane
Joined Mar 2000
1,636 Posts
The buddy box can be a "dumb" (read as cheap) transmitter - no batteries crystal etc needed!
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Old Apr 11, 2003, 08:11 AM
dusty bible = dirty life
Majortomski's Avatar
Oklahoma City OK USA Where fakts still exist even if they are ignored
Joined Aug 2000
2,768 Posts
Omega, a little more detailed answer. A "buddy box" can be a complete second transmitter that is compatible with your transmitter that is hooked up to your transmitter through a "trainer cord". Except for JR, the second "buddy" transmitter is left off, and in all cases the second antenna is left down. As said in the earlier post, most commercially available buddy boxes are only the potentiometers behind the sticks, and enough electronics to make it work as a buddy box, they do not transmit at all.

The instructor flies your airplane through your transmitter. When the student is ready to take control the instructor holds down a spring loaded (dead man) switch on the primary transmitter and control is passed to the student. If the student gets in trouble, all the instructor has to do is let go of the dead man and he has immediate control of the airplane. Much better that the days of passing the box I went through in the 70's.

Now for problems. The transmitters must be compatible. Ideally use brand for brand. i.e. Futaba with Futaba, etc. However, Hitec will work with Futaba and vice-versa. JR will ONLY work with JR and it has a completely different trainer cord than the ones compatible with Futaba. JR buddy boxes have a battery that must be charged, and their trainer cord will turn on the buddy box even though the switch may be in the off position. So don't leave a JR buddy cord plugged into either box when you're not flying, be cause you'll still be transmitting and running downt he battery in the buddy box. GWS is now marketing an inexpensive transmitter made to be compatible with either system. If both boxes have servo reversing switches, you can have all of the controls backwards on the buddy box. BE SURE to test everything on the ground so that the controlls move the right way with input from the buddy box. If you're flying off of a computer radio and the buddy box is a simple four channel unit you may not have enough trim on the buddy box to take care of the sub trim that is dialed in on the computer radio. If this is the case make sure the computer radio has all its subtrims AND EXPONENTIAL set to ZERO. Otherwise the student may not be able to fly from the buddy box.

Safest way I've found in five years of teaching.
The instructor makes a short flight with the plane to make sure it's trimmed. Land, turn the motor off and plug in the buddy box. Activate the buddy box and be sure; a. that the controls are moving the correct direction from the buddy box, and b. set the trim on the buddy box to match the master box. When you push the dead man, the controls shoud stay in the same positon. If theyare moving even slightly adjust the trims on the buddy box so that the flight controls on the plane stay in the same place. This way you are flying with the same trim the instructor set on the first flight

HTH
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Old Apr 11, 2003, 11:31 AM
smoking a buddy box
olivier2's Avatar
Brussels
Joined Nov 2002
419 Posts
Hi, "Omega",

Check out my website for more than 30 diagrams for trainer cords. Just take care with Hitec and read about the possible problems of this brand in chapter 3.

Olivier
http://users.belgacom.net/TX2TX : buddy box compatibility problems between different brands of transmitters
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Last edited by olivier2; May 02, 2003 at 03:18 AM.
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Old Apr 12, 2003, 06:35 AM
Will work for planes
omega blood's Avatar
Fullerton, California, United States
Joined Jan 2002
1,783 Posts
Thanks guys that clears that up. I thought they were 2 different things. also thanks for the link oliver2.

P.S. Thomas you should write beginers books with that kind of clear, consise and detailed expaination. Wow. Impressive.
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