Modifying to radio control
|Steve Gregory 1||27/02/2010 14:34:44|
40 forum posts
I have started to do a few conversions to my kit to allow for radio control, using electric motor drive to all 3 props.
I have been thinking about cooling for the motors and have decided to use one method which the boat is already fitted with. "Engine room air intake". Its already in place, has a cooling air grille, so not blocked, all you have to do is drill the underside plastic deck to allow passage of air down to [or hot air from] the motors. I have thought about cooling coils, but thats more weight and more holes under the waterline.
The addition of an "eduard etch kit [eduard part no 53 025] helped here as they supply a nice metal etched grille for this air intake, but the original plastic mesh would still suffice to get air movement in and out of the hull.
Same goes for all the smaller air vents on the deck surface, these are hollow, so why not use them, as when under power, these vents are way out of dreaded waters reach.
I have also modified the bofors gun to allow it to be elevated to any angle at any time, as the kit instructions if followed correctly, only allow you to "pose" once, then glue. it simply means replacing the 2 hydraulic pistons [part no's 82E x2] with a single piece of 0.8mm dia brass rod, cut to length you can replace the piston rod on one side, angle through 90 degrees, through the lower gun gearing, then out the other side, bend again, then install back in to the gun cradle, putting the brass rods back in to the original cylinder holes, now the gun elevates as it should, the hydraulic cylinders rotate as they follow the piston angles exactly.
Something i did find lacking from all the other PT 596 boat build's I've read so far, but if I find any more as I go along, I will add to this post.
|Steve Gregory 1||27/02/2010 14:45:04|
40 forum posts
have uploaded pictures of these additions/conversions, please check my photo album labelled "Pt 596", hope they help !
|Steve Gregory 1||24/11/2010 10:16:37|
40 forum posts
Things have m,oved on a little [well, quite a lot now] since I started this thread, but will continue it to show the completed boat.
I fitted 3 graupner speed 400's to the hull, as I wanted it to both look the part, having 3 props underneath as well as giving it enough thrust through the water to get it to plane correctly. I feel simply putting a single propeller under such a boat is defeating the object and once on a static display stand, looks like a cheapened conversion, rather than a full build.
I used SHG universal "dog bone" couplings and attached them to 2mm stainless steel propshafts, the brass robesch propellers are 20mm diameter.
When driving all 3 props at speed i appreciated there could be some "turning difficulty", so wanted to be able to cut out the inner motor on tigth turns. Ok, so plenty of electronic devices about to do this for you, but they cost money, so how to do this cheaply? Easiest solution was from the magazine again. Simply fit 2 micro switches on a plate that surrounds the rudder servo, so as the rudder servo turns, it hits against one of the switches, and it cuts power to the inner engine. Fit a second servo on the opposite side of the rudder post arm and that cuts the other inner engine on the opposite turn. Word of warning, take some time to get f these micro switches right, otherwise even on a slight turn, it will cut a motor out, and you really only need this on faster tighter turns to keep the boat planing on turns. Afterall, 2 micro switches and a few bits of plastic for the base is what? less than £3.50 all in, whats the cost of an electronic item-- yeah in excess of £50, thats a lot of money if you aint got it to spare.
|Kevin Bellman||24/11/2010 22:19:52|
68 forum posts
Keep the info/pics coming - most interesting.
I've got an Elco stashed in the loft for a future project
|ashley needham||27/11/2010 20:58:49|
7318 forum posts
Steve, I like the idea of the SHG dogbone couplings, as they are cheap, easy to fit and give a good range of alignment, or tolerance to misalignment, perhaps....any way I fitted them to Me ship and find they are a bit noisy, is this your finding as well ?
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