How to Buddy Box an LP5DSM

Make Your Poor Man's DX7 RC Transmitter Fly BuddyBox

Here are the simple steps to prepare the Eflite LP5DSM for buddy box flight.

Step 1 : Remove the four screws in the four corners of the case back

LP5 DSM Transmitter Back

  • Step 2 : Separate the two halves of the radio and gently open them like a clamshell, taking care to avoid pulling on the wires that are connected to both halves

LD5 DSM Open

Step 3 : Cut the black and red wires at A - as shown in the photo below - at different lengths to lessen the chance of electrical short

LP5 DSM buddy box wires cut

Step 4 : Insulate the cut wire ends in electrical tape or shrink wrap and carefully close the two halves of the radio, replacing the screws

NOTE: The DIP switches under the hatch in the lower left corner of the transmitter are for servo reversing so make sure they're in the correct position for your aircraft. The up position is equal to "ON" and the down position is "OFF" and here's our best explanation of what each switch can do for you:

  1. ON is for airplanes and OFF is for helicopters - default setting is on
  2. CCPM or cyclic collective pitch mixing for helicopters - default setting is off
  3. elevator and rudder mixing for V-tail airplanes (i.e. Slo-V) - default setting is off
  4. elevator and aileron mixing for elevon airplanes (i.e. Striker) - default setting is off
  5. throttle reverse - default setting is off
  6. aileron reverse - default setting is off
  7. elevator reverse - default setting is off
  8. rudder reverse - default setting is off
  9. 5ch reverse - gyro or gear - default setting is off
  10. auxiliary

Don't be afraid to experiment with your DIP switches. Sometimes you run into a servo that operates backwards, or you want to fly an entirely different plane or heli than usual. Go for it. You can always switch them back.

Psssst... while you're in there, here's a couple more tiny mods to consider for the Eflite LP5DSM:

LP5DSM Throttle Rib Override

Smooth out the Bumps on the LP5DSM

Things you need:

  • phillips screwdrver
  • half inch of RC fuel line
  • 15 minutes + -

For the most part the LP5DSM is an excellent radio, but the tiny ribs in the throttle gymbal made it hard for me to fly my helicopters. Here's how I modified it to smooth out the bumps and make it perfect for flying my CX2 and MCX.

Step 1 : Remove the screw labelled A in the photo below:

LP5 DSM Inside

  • Step 2 : Slip fuel line over the sheet metal prong
  • Step 3 : Replace the prong with the screw as it was
  • Step 4 : Gently pry the metal prong toward you, away from the gymbal, to loosen the throttle

Don't worry about bending it too far - if you do, just remove it, bend it straighter again, and reinstall it. After you get it just right for you, your throttle channel will feel smoother.

Adjust the LP5DSM Gymbals for a Custom Feel

Some like the sticks slippy, some like them grippy

The LP5DSM by Eflite was the first radio I ever used for flying, and I liked it from the first. After I started flying more models and using more transmitters, I realized the feel of the gymbals could be better for me, so I opened it up to see if there was anything I could do about it. Just like in car suspension, everybody has their own idea of the perfect level of ease or stiffness in their gymbals.

Things you need:

  • phillips screwdriver
  • 15 minutes

After I got inside the case, I found it was easy and quick to adjust the resistance and customize the feel of the LP5DSM perfectly just by turning a screw. Here's how I did it:

  • Step 1 : Locate the screws as seen at three points marked B in the photo below:


  • Step 2 : Loosen the screw to get a softer, more relaxed feel in your gymbals
  • Step 3 : Tighten it to increase to a firmer resistance in your gymbals

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