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Member postings for Dave Cooper 6

Here is a list of all the postings Dave Cooper 6 has made in our forums. Click on a thread name to jump to the thread.

Thread: Returning modeller
09/07/2020 10:52:32

Hi Jim

There seems like a lot to learn at the start ! The best advice I can give is to find what works for you.

Inevitably, you will make purchases which don't work out. Put these in the 'spares' box - they'll come in handy one day...

Two further bits of advice :-

1. Join a club - benefits too long to list !

2. Test on the bench first (especially battery life), then in the bath - leaks, power test, rudder and prop under load etc.

Most importantly - have fun !

Dave C

08/07/2020 22:04:24

Back-tracking the thread a little, and just a quick addendum on the NiCad latest information is that whilst they are illegal to sell, they are still legal to use. I use one in a RC slope soarer glider powering just the Rx and two control servos.

Having said that, they do suffer from the 'memory' and 'black-wire corrosion' problems and are not very planet-friendly !

I think they still have a use on the bench as a temporary power source for testing, but, one by one, my models (including the little RAF launch) are now converted to LiPo power.

Connectors: (Power) I suppose everyone has their favourite(s) - I am slowly standardising on the "XT60" type, but have gold-plated 'bullet' connectors in one model. Both work well. I find the bullets are easier if you need a quick change. (Radio) I'm slowly standardising on the Futaba colour code as I find this the least confusing...

Good luck with your project,

Dave C

Thread: Auxiliary Drive for Pride of Baltimore
25/06/2020 10:47:22

I'm just wondering what, exactly, is the purpose of the auxiliary motor(s) ?

Is it just to get the boat back to 'base' if the wind dies, or, is there is a scale application here - ie does it need to supplement sail power in order to achieve scale speed ?

Context: I'm learning about scale sailing and have a need for something auxiliary on Yacht Ardent (mine may well be a little electric outboard hung off the stern though...)

I'll follow the thread with interest !


Thread: Yacht Ardent
24/06/2020 23:57:47

Yes Ray - quite a lot of Permagrit tools of various sizes in almost constant use, but, I am a bit space limited at present.

I think though, moving things around a bit I could make space for a scroll or band saw if it had a small 'foot-print' on the bench ?

My trusty hand fret saw at the ready though with a selection of blades ! Plans to be ordered soon once one or two other projects further advanced...

Dave C

24/06/2020 15:38:58

Fair point Dave, and effectively concurs with what Eddie and Ray are saying.

I recently spent the best part of an afternoon doing a drawing in MS Paint for a local engineering firm to cut and drill a top for my welding bench. Quite honestly, I could have done it in half an hour on a drawing board !

For 'one-off' jobs, the wonders of CNC etc probably aren't worth I'm saving up for a decent lathe at present, the specialist machining saws may have to wait for Father Christmas.

Cheers for now,

Dave C

24/06/2020 10:57:33

Thanks both,

I have quite a large amount of 3mm marine ply given to me as 'left-overs' from my next door neighbour who is just completing a rowing scull.

I was just wondering if this would do for the frames (or, anything else) on Ardent ?



23/06/2020 23:05:53

I tried both "Belair" and "SLEC" for a quote for a laser cut kit for yacht Ardent.

No reply from Belair (probably not their thing as they do mainly aircraft stuff)...

SLEC replied (eventually) but want to see the plans first, plus a list of required parts - I would have thought they could work that out from the plans !

As I'm just looking for an 'order of costs' at this stage I was wondering if anyone else has similar experience.

Eddie - looking at the plans on-line, there doesn't seem to be all that much fretting /cutting out to do ? Is that fair comment ? (I'll be doing it manually)...



Thread: Wiring a boat for beginner
23/06/2020 11:08:20

Hello Harry and Rob,

Harry - I wasn't able to open Dave M's diagram, but, one thing to include in the wiring is an appropriate fuse to protect the circuit(s). This can be of the inexpensive 'car' type (blade or cartridge). I'm sure Dave will be able to advise further on this if he hasn't already done so...

Rob - There are quite a few Youtube videos on FrSky /Taranis and many models to choose from. A lot of our own club mates use something called "Open TX" for programming the transmitter. See if you can find someone who has done this as it's quite a learning curve.

By the sound of it, your motors are "brushed" (rather than "brushless", so you will need an appropriate ESC, or two, to go with them. If I were you, I would consult Dave M on this.

Hope this helps

Thread: Fairmile D - help needed
22/06/2020 10:56:25

Hi David

Could I suggest a few simple tests before "committing pond" :-

- Run it on the bench in your proposed configuration. If you have the electrical test kit, measure amps (and watts) at different throttle settings. Quickly touch the ESC - insulated part - and feel the temperature.

- Put the props under static load, finger on end of prop boss(es), or, simple scrap balsa wood 'snubbers'. Check ESC temp again.

- Bath test. Feel the pull at the stern with different throttle settings. Check ESC temps.

if you have to quickly withdraw your finger from the ESC in any of the above - it's running too hot ! You need to do something about it...

Battery life /power delivery etc - These days, for a high-speed launch (brushed or brushless motors), I would only really consider LiPo's, although NiMh's (or, equivalent) may also be ok. One way or another, you need to establish your battery life before going on the water. Most modern Tx's have a timer facility - set it to a conservative amount initially.

In short - test, test, test...good luck,

Dave C

16/06/2020 10:44:02

David, my Dad was a skipper on 70' recue launches in the war. They mainly used the two 'outer' throttles for manoeuvring in harbour (3 shaft boat). I imagine at speed it would just be helm steering...

For the cooling on my boat I made some air extraction vents. You can just see these on the album "Dave's RAF Launch", (currently on page 5 of Albums) - between the main mast and the gun turret.

I use an old-fashioned "Bob's Board" - resistive mat - type of speed controller. Very 'old-tech' now and was concerned about heat build-up in the hull. So far it has worked well.

The air vents work on a simple aerodynamic principle, any water spills over the top decking run down to the stern and there is an internal lip in the vents to prevent any 'backwash' (probably overkill !).

You may be able to fit /hide something similar on your boat - as long as they have a supply of reasonably undisturbed air they should work...

Let us know how you get on

15/06/2020 11:01:59

On my little RAF Rescue launch (1/48 scale). I made the main superstructure removable. Space is quite tight inside...

This gives access to Rx, motor, coupling, top end of shaft, speed controller and LiPo (battery pack). Rudder access and servo linkage was more difficult. I fitted a separate screw down hatch at the stern for this at a later date.

It was easier for me as, being an own design, I made a lot of it up a I went along....I wouldn't worry too much about deck joins etc showing as once it's out on the water you won't be able to see them !

Have fun,

Dave C

Thread: Yacht Ardent
13/06/2020 10:44:47

Thanks all for the info',

I knew a lathe would be useful somewhere along the line !

I found that machining carbon fibre needs a good dust collection system otherwise my shelves etc get covered in fine carbon dust...whereas, with good old-fashioned ali' and brass I can get away with a dust pan and brush.

Not tried silver soldering yet but, have just bought a new TIG machine to try out...maybe on very low amps ? Otherwise, a butane /propane torch and the right flux and solder ?



11/06/2020 15:36:59

Thanks both. I guess the next stage is to buy the plan from Sarik.

Eddie - I'll come back to you at 'mast time' - I have quite a stock of aluminium tubing now as currently making the rear wing spars for my sportscar. Is the mast likely to be taller than 1 metre ? If so, I'll need to make a join somewhere...



11/06/2020 10:54:46

Thanks Ray - that's reassuring. I'm probably being over-cautious !

Coming back to lathes, is yours an ML7 ? I don't think I'll have room for a floor-mounted model, but, I'm currently looking for a bench-top one. About 2-3 foot between centres and 7.5" swing over the bed....any recommendations ?

Cheers for now,


10/06/2020 21:40:03

Thanks Eddie - a few further queries if you don't mind...

I've asked SLEC to quote for a laser-cut kit, but, on looking at your build thread there doesn't seem to be all that much cutting out to do - at least for the hull frames ?

I'm a bit nervous about making the sails though. Is this covered on the plan /article ?

Also, I'd like to experiment with vane steering and Arduino control at some point. Others have commented that I'll probably need a 'Y' shaped backstay to achieve this. However, I'll probably start with conventional RC initially.

One other thing I'd like is to have a small motor with folding prop as a 'get-out-of-jail' option mid-lake. I think Dave M suggested (in another thread) that Graupner used to do an all-in-one motor /shaft /prop unit that seems ideal...

Any views /experiences here most helpful,


Dave C

10/06/2020 15:57:08

Just found it ! "Under Sailing Boats and Yachts" (155) - with your SKU. - Most bizzare !

I think they need to work on their database search facility...


10/06/2020 15:50:01

Eddie - "MAR 3022" seems to relate to a group of plans on Sarik's website (about 5 pages worth), but, 'Ardent' was not amongst them ? This result was using their Search Box under 'Boat Builder Plans' section.

Bit of a puzzle ?

10/06/2020 15:33:10

Thanks both. I see SLEC and Sarik are advertising on the columns to the right of the posting windows.....

I believe SLEC do kits based on supplied plans for aircraft, so, will try them.

Eddie - does Ardent sail well ?

Ray - do you have any spare capacity on your Myford ? I'm looking for a lathe (and Mill drill) at present but not having much luck on the more affordable used market.



10/06/2020 10:39:43

Hi Folks,

Decided to go 'where the wind blows' for my next boat project..

A couple of challenges though :-

1. Quite like the look of "Yacht Ardent" which I think, originally, was a Model Maker plan. I have, previously, seen this on Sarik's website, but, the name "Ardent" seems to now refer to a different model (a tug ?).

2. Would quite like a quote from a laser-cut kit supplier to take said plan and deliver a kit (at least for the hull). Preferably, someone with boat experience !

So, if anyone could supply the MM plan code, (assuming it's a Model Maker one), I could try and run that by Sarik unless, perhaps, someone has a plan for sale maybe ?

Thanks for any assistance,

Dave C

Thread: Propshaft coming away from coupling
08/06/2020 22:45:26

Hi Jonny

The good news is that the flat doesn't need to be all that big - just enough for the end of the grub-screw to bite on is good enough. As they say above, best to use some 'Loctite' (or, similar thread compound) as well on the grub's thread.

I was a bit tight for space on my little RAF launch, so I took the rudder and prop shaft out to do it. Just a light touch on the bench grinder will do it, or, use a small hand file on the coupling end of the shaft.

If you have a fairly large hull you may be able to do it 'in-situ'. Lock nuts also seem like a good idea, although I didn't find I needed any...

Good luck with the mod'

Dave C

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