Wasp by Glynn Guest
(free in Model Boat magazine December 1999)
14 Jul 20 - Added two pictures of the electric conversion.
|Number of launches / Time||6||
|Overall Length||21 "||0.53 m|
|Beam||9 "||0.23 m|
|Weight||2 lb. 11 oz.||1.22 kg|
|Motor||Trinity T-Tech 540 buggy motor - 17T Single|
|Gearbox||1.4:1 made from S.H.Muffett moulded spur gears. (catalogue on-line at http://www.muffett.co.uk, or e-mail & ask for a printed version)|
|Batteries||6 Sanyo RC-2000 cells|
|Speed Controller||Gordon Tarling Micro-Star 40|
|Receiver||Hitec Feather - PPM - 4 channel - 40 MHz|
|Receiver Battery||4 cell Sanyo 120 mAh|
|Servos||Rudder - Hobby Stores SS-2000|
|Performance||Graupner Speed 600 Race with 3:1 ratio
(8 cells) - Handling is excellent and the ride is rock steady. The speed is a
little low and development continues. Motor run time is approx. 18
Trinity T-Tech 540 buggy motor with 3:1 ratio (6 cells) - Handling is just as good, but speed slightly reduced. Motor run time is approx. 15 minutes
Trinity T-Tech 540 buggy motor with 1.4:1 ratio (6 cells) - Not yet tested.
15 Apr 00 - I have changed to drive ratio to 1.4:1 and have retained the previous motor and propeller.
2 Apr 00 - I have now completed the model and given it a few outings. I have decided to attempt to use this model to enter the SWAMBC G500 class. This requires that no more than 6 cells are used and they must be Sub-C size. Other than that, pretty much anything goes. It is rock steady and handles very well, but is not particularly quick I will be experimenting over the coming weeks to improve the speed. The motor was changed to a Trinity T-Tech 540 buggy motor with the same gearbox to try and increase the speed.
13 Mar 00 - This boat was originally designed for a 1.5 to 2.5 cc marine i.c. motor. I decided to build it and converted it to electric power as i.c. motors are not permitted at my model boat club. I decided that a Graupner Speed 600 Race motor, coupled to a gearbox should produce good results. However, the arrangement has the flexibility to allow changing of the gear ratio if suitable gears are purchased. I have completed the building of the hull and I'm part way through painting.
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