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Mounting Arms

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Arms for GPS or PDA units
There are 2 styles of mounting arms available for mounting GPS units and PDAs in gliders.

  • Articulated Arms
    These are double jointed arms.  They are generally more rigid than flex arms but they are a little more difficult to adjust while in flight. The small RAM "A" size arms are OK for light loads (small PDA only) but the RAM "B" size arms are recommended for heavier loads (larger PDA or PDA with GPS).

  • Flex Arms (Goosenecks)
    These are very easy to adjust in flight, but they are less rigid than articulated arms.  They are friction devices which will become less stiff over time as they are used.  However, I include stiffening rods in the longer flex arms to eliminate that problem.   

PDA Cradle Mounting Suggestions
Click on the images below to view larger versions.
 
PDA Cradle with 0.3 m (11.8") Cable, Panel Mounted DB-9f Connector, and Panel Mounted Gooseneck - My Favorite Option
This is my favorite option because it does not require the use of a 57 mm instrument hole and the panel mounted DB-9f connector and GnBase2 gooseneck base make it possible to remove the gooseneck and PDA very quickly and easily.  That is not possible when a 1 m cradle cable is run through the instrument panel.  Also, the panel mounted connector can be connected to either the PDA, or a PC without the need to get behind the instrument panel. 

The panel mounted DB-9f connector is the panel end of either a CAI-Pnl-0.5 or LX7007-Pnl-0.5 cable. The CAI-Pnl-0.5 cable runs from the back of a Cambridge 302 or Goddard PS-5a power converter or Borgelt PDA-PS power converter to a panel mounted DB-9f connector.  The LX7007-Pnl-0.5 runs from the back of an LX7007 to a panel mounted DB-9f connector.  The panel end of either of those cables mounts to the back of the instrument panel and is accessible through a small rectangular hole in the panel.  The short cable from the PDA cradle is connected to the panel mounted CAI-Pnl-0.5 or LX7007-Pnl-0.5.  The panel end of the CAI-Pnl-0.5 or LX7007-Pnl-0.5 can be mounted anywhere on the instrument panel - near where the gooseneck is attached to the panel. 

The gooseneck can be mounted directly through a 0.39" (10 mm) hole the panel and secured with the supplied nut and lock washer on the back side of the panel.   However, many pilots prefer the optional GnBase2 gooseneck mounting base which provides a more stable mounting point for the gooseneck and also makes it easy to remove the gooseneck at any time.  When the gooseneck is mounted through the panel it is tough to remove because it is secured with a nut an washer on the back side of the panel.  The GnBase2 mounts on the front (pilot side) of the instrument panel and the gooseneck screws into it. 

Parts List

  • PDA Cradle with short 0.3 m (11.8") power data cable to a DB-9m connector
  • GNeck2-Assy-Panel-DB-9 - Includes the items below:
    • RAM-GN3-238 adapter plate for mounting the cradle to the gooseneck
    • GNeck2 gooseneck in 3, 6 or 9 inch (7.6, 15.2 or 22.9 cm) lengths
    • GnBase2 Round gooseneck mounting base
    • CAI-Pnl-0.5 or LX7007-Pnl-0.5 extension cable with panel mounted connector

 

PDA Cradle with 0.3 m (11.8") Cable, Gooseneck, and Gn57mmPlateDB-9 Mounting Plate - Great Option
This is a great option if you have a spare 57 mm instrument hole.  The panel mounted DB-9f connector makes it possible to remove the PDA cradle (but not the gooseneck) very quickly and easily.  That is not possible when a 1 m cradle cable is run through the instrument panel.  Also, the panel mounted connector can be connected to either the PDA, or a PC without the need to get behind the instrument panel. 

The Gn57mmPlateDB-9 fits in a 57 mm instrument hole and includes a mounting hole for the gooseneck and mounting holes for either a CAI-Pnl-0.5 or LX7007-Pnl-0.5 cable.  The CAI-Pnl-0.5 cable runs from the back of a Cambridge 302 or Goddard PS-5a power converter or Borgelt PDA-PS power converter to a panel mounted DB-9f connector.  The LX7007-Pnl-0.5 runs from the back of an LX7007 to a panel mounted DB-9f connector.  The Gn57mmPlateDB-9 is designed specifically as a mounting point for the DB-9f connector.  The short cable from the PDA cradle is connected to the panel mounted CAI-Pnl-0.5 or LX7007-Pnl-0.5.  

Parts List

 

PDA Cradle with Gooseneck and 1 m Cable Run Through a Slot at the Side of an Instrument Hole - Popular Option
The images above show a neat trick for running a 1 m long power/data cable through the instrument panel without the need to remove the DB-9 connector.  Simply remove the nearest instrument and file a slot for the cable on the side or top or bottom of the instrument hole.  Then put the cable in the slot and re-install the instrument.  Alternatively, the slot can be at the edge of the panel where the panel meets the instrument panel cover.  This technique works great with a PDA cradle with a 1 m long power/data cable.

The gooseneck can be mounted directly through a 0.39" (10 mm) hole the panel and secured with the supplied nut and lock washer on the back side of the panel.   However, many pilots prefer the optional GnBase2 gooseneck mounting base which provides a more stable mounting point for the gooseneck and also makes it easy to remove the gooseneck at any time.  When the gooseneck is mounted through the panel it is tough to remove because it is secured with a nut an washer on the back side of the panel. The GnBase2 mounts on the front (pilot side) of the instrument panel and the gooseneck screws into it.  The power/data cable plugs directly into the flight computer or GPS flight recorder or Goddard PS-5a power converter or Borgelt PDA-PS power converter.  The downside of this installation is that the cradle cannot be removed from the glider without removing the instrument that the cable runs by.

Note: The gooseneck adapter plates are designed so that it is possible to route the power/data cable through the gooseneck.  However, the cradle is shipped with the DB-9m connector already attached.  You would need to remove and reattach the DB-9m connector if you decided to route the cable through the gooseneck.  I don't recommend that because it is difficult to do well and will probably reduce the reliability of the system (don't mess with a well soldered connector).

Parts List

  • PDA Cradle with 1 m (39.4") power data cable to a DB-9m connector
  • GNeck2-Assy-Panel - Includes the items below:
    • RAM-GN3-238 adapter plate for mounting the cradle to the gooseneck
    • GNeck2 gooseneck in 3, 6 or 9 inch (7.6, 15.2 or 22.9 cm) lengths
    • GnBase2 Round gooseneck mounting base

 

PDA Cradle with 1 m Cable, Gooseneck, and Gn57mmPlate2 Mounting Plate
The Gn57mmPlate2 fits in a 57 mm instrument hole and includes a mounting hole for the gooseneck and a slot for the power/data cable.  It would be used with a PDA cradle with a 1 m long power/data cable.  The cable is inserted into the slot in the plate before it is mounted in the panel so the DB-9 connector does not need to be removed from the end of the cable.  The power/data cable plugs directly into the flight computer or GPS flight recorder or Goddard PS-5a power converter or Borgelt PDA-PS power converter.  The downside of this installation is that the cradle cannot be removed from the glider without removing the Gn57mmPlate2 from the panel.

Note: The gooseneck adapter plates are designed so that it is possible to route the power/data cable through the gooseneck.  However, the cradle is shipped with the DB-9m connector already attached.  You would need to remove and reattach the DB-9m connector if you decided to route the cable through the gooseneck.  I don't recommend that because it is difficult to do well and will probably reduce the reliability of the system (don't mess with a well soldered connector).

Parts List

  • PDA Cradle with 1 m (39.4") power data cable to a DB-9m connector
  • GNeck2-Assy-Plate - Includes the items below:
    • RAM-GN3-238 adapter plate for mounting the cradle to the gooseneck
    • GNeck2 gooseneck in 3, 6 or 9 inch (7.6, 15.2 or 22.9 cm) lengths
    • Gn57mmPlate2 Mounting plate for 57 mm instrument hole

 

 

PDA Mount Manufacturers
Manufacturer
Click on company name to see details
Description Photos
Click on image to see details
Logo
Cumulus Soaring, Inc. Flex Arms (Goosenecks), mounting adapters
Miscellaneous NavPad Leg mounted PDA/GPS Mount  
RAM Articulated arms

 

Mounting Arm Selection Guide
The photos below are to approximately the same scale.  Click on the images to view larger versions.
   
RAM-A-101
3 1/8 inches
(80 mm)
RAM-A-101-L
4 5/8" (12 cm)
GNeck2
Gooseneck Flex Arm
3" (7.6 cm),
6" (15.2 cm)
or 9" (22.9 cm)
Recommended - Best Option
RAP-105-6DD
6.38" (162 mm)
   

or

RAM-B-Arm-Short-MBase
3.75 inches (95 mm)
RAM-B-Arm-Short-PlBase
4.375 inches (111 mm)
RAP-B-Arm-Std-MBase
5.0625 inches (129 mm)
RAP-B-Arm-Std-PlBase
5.625 inches (143 mm)
Recommended
RAM-B-Arm-Long-MBase
7.375 inches (187 mm)
RAM-B-Arm-Long-PlBase
8 inches (203 mm)

Suction Cup Mounts

Suction Cup Mount Selection Guide

Miscellaneous

Suction cup mounts for GPS Antennas


Suction Cup Mount for GPS Antenna

RAM

Suction Cup Mounts for PDAs, GPSs and GPS Flight Recorders or or or
RAM-B-SCMK-RAP-B-201-RAM-B-238

or
RAM-B-SCMK-RAP-B-201-RAP-B-238
or
RAM-B-SCMK-RAP-B-201-RAM-B-202

or
RAM-B-SCMK-RAP-B-201-RAM-B-237

Mounts for GPS Flight Recorders

GPS Flight Recorder Mounting Suggestions
RAM-B-SCMK-RAP-B-201-RAM-B-238
(A little filing is required to get the holes to line
up with the holes in the Colibri mounting plate.)
LX Colibri
GPS Flight Recorder
 
or
RAM-B-SCMK-RAP-B-201-RAM-B-202
(you supply double-sided tape or Velcro)
Volkslogger or EW microRecorder
GPS Flight Recorder
 
or
RAM-B-SCMK-RAP-B-201-RAM-B-237 CAI GPS-NAV or 302A
Flight Recorder

Cumulus Soaring, Inc.
Paul E. Remde

8661 Connelly Place
Savage, Minnesota 55378
USA


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