need some advice please

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need some advice please

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20 October 2015 at 21:22 #60940
Christopher Spice
Participant
@christopherspice
I have an action p94L speed controller and a p100 sound unit (noisy thing) and p97 amp, all running off two 7.4 battery, and two supper motor 600.

the problem I have the two motors I am using make a lot of noise threw the amp I have put some suppresser on them rated at 103f there is 3 on each motor but still getting the noise, when the motors not running the noisy thing works well, you can hear the engine starts and runs on tick over, but as soon I move the stick on the remote all you here is the noise of the motor.

I was thinking of using brushless motors but do not know any thing about them, like can you use two motors on one speed controller? or what motors to use

these are in a 12 scale Mersey life boat I am making can any one please help me

Christopher spice
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20 October 2015 at 21:22 #2516
Christopher Spice
Participant
@christopherspice
lots of noise
20 October 2015 at 23:09 #60948
Dave Milbourn
Participant
@davemilbourn48782
If by P94L you mean the 10A Lite version then you are severely over-stretching it. A Speed 600 of any description needs the 20A version.
You haven't said whether the two batteries are in series or parallel. If in parallel then you're getting maybe 2W from the amplifier, which really needs in excess of 10v to obtain any respectable amplification. If in series then you're over-stretching the P97 which will blow at anything more than 15v. Two 5-cell NiMH packs in series is optimum (or one 3S LiPo).
You can't run more than one brushless motor from one speed controller. They don't work like brushed motor speed controllers – you need one ESC for each motor. The P94 won't run brushless motors.

DM
26 October 2015 at 22:43 #61072
Christopher Spice
Participant
@christopherspice
hi Dave Milbourn I have sorted the problem out I put in two smaller motors in the boat which are 380 this works ok

I try it with out the motors first the sound worked, no horrid noise. Then conected the motors and all is ok.

thanks for your help most appreciated Christopher Spice
27 October 2015 at 22:24 #61085
Malcolm Frary
Participant
@malcolmfrary95515
There was some discussion about using 2 brushless motors on one ESC a while back on RCGroups.

http://www.rcgroups.com/forums/showthread.php?t=2293170&highlight=here+be+dragons&page=3

starting about post#43. The guy actually tried it and, despite all dogma to the contrary, it worked. And a vid of it working post #49.

But whatever motors are used, the batteries and wiring (and ESC(s)) need to be able to support the current demand.
4 November 2015 at 18:06 #61190
steven blythe
Participant
@stevenblythe41527
Ok, I am completely new to all this… I have been interested in modelling for a while, but I have decide to design and build a simple model for my school a level project, (I am 16). I am basing it of vic smeed's twinkler, purely because I found the plan in the 65th anniversary edition of the magazine, which I found at the local news agents. I have designed the main hull sections and these are ready to cut out, it is 30" long by 8" wide. I also have a FROG marine diesel engine I wish to put in it… any advice as I am pretty clueless…
4 November 2015 at 19:51 #61192
Paul T
Participant
@pault84577
Hello Steven

There is loads of advice on this forum but you will have to be a little more specific regarding which advice you need. eg. sticking the frame together, putting the skin on, installing the motor, fitting the radio gear.

If you ask a specific question you will receive a load of advice (some of it good) but I have a question for you…..why do you want to use a FROG engine when there is the easier option of electric motors?

Paul
4 November 2015 at 20:13 #61193
Dodgy Geezer 1
Participant
@dodgygeezer1
I also have a FROG marine diesel engine I wish to put in it… any advice as I am pretty clueless…

The reason people will advise against internal combustion engines is that:

1 – many boating ponds ban their use

2 – consequently they are rare and extra items for them like silencers or fuel are hard to come by

3 – starting and running them is a bit of a messy art which was usually learned by running the motor on a bench initially – all making for a lot more work

Modern electric motors, and, especially, modern battery technology can now produce boat speeds comparable with internal combustion engines, and these are cleaner and much easier to operate…

I don't know about your timescales, but you may find starting with a simpler balsawood model is an easier introduction to the hobby – there are some free plans for starter kits here:

http://eezebilt.co.vu/plans.html

Edited By Dodgy Geezer on 04/11/2015 20:13:58

Edited By Dodgy Geezer on 04/11/2015 20:14:37

Edited By Dodgy Geezer on 04/11/2015 20:17:48
5 November 2015 at 10:11 #61200
Malcolm Frary
Participant
@malcolmfrary95515
In all probability a standard 540 run on its rated max voltage would give the same performance with easier starting. Plus, you don't need to build anything like as strong – it will not have to withstand someone pulling on a starter cord. It will not need a fuel proof coating on the paint.
5 November 2015 at 10:50 #61201
Dave Milbourn
Participant
@davemilbourn48782
Steven

If you really want to run a small diesel-powered boat then I suggest you have a look at The Vintage Model Boat Company's website. Their models are all plywood and certainly the one I built (Sea Nymph) had the original plan which shows a small diesel engine. **LINK**

Twinkler, being all-balsa, would be prone to damage and not easy to maintain or operate with the Frog engine in it. As all of my colleagues have said, you'd be better advised to fit an electric motor for your first model. There's no point in making things more difficult than they need be. A standard 540 motor (e.g. MFA 540/1) on 7.2v with a 35mm 2-blade prop would be a good place to start. **LINK**

Dave Milbourn (I drew the updated Twinkler plans)
5 November 2015 at 16:15 #61202
steven blythe
Participant
@stevenblythe41527
thanks, I will be using the model on lake Windermere, as there are no local boating ponds that I know of. I will build the frame out of plywood. the reason I wish to use diesel is that I already had the engine which belonged to my dad, also I am slightly obsessed with anything mechanical…
5 November 2015 at 17:55 #61204
Paul T
Participant
@pault84577
Hi Steven

The Frog engine will be fine in your model especially as you are building in plywood, the only problem that I ever had with little diesels (or any small IC) is the lack of reverse, even when sailing on the local canal I was always running out of manoeuvring space and forever getting the bow stuck and had to use a fishing rod to hook the boat and bring it back.

As you are intending to use the diesel and sail on Windermere it might be a good idea to beef up the keel and frames by opting for a slightly thicker ply.

You are also very lucky having a direct line to our Mr Milbourn for answers to specialist design information such as C of G or critical stress points. (I might rib him but he really is the best person to ask)

Good luck with the build

Paul

Edited By Paul T on 05/11/2015 17:58:19
5 November 2015 at 19:27 #61205
Tony Hadley
Participant
@tonyhadley
The original 1963 "Twinkler" was fitted with a small i.c. motor, below is one of the pages from the RCME magazine item.

If you are using an i.c. power plant always think about a method of getting the model back should the engine stop in the lake, should this be either a stall or run out of fuel. It does happen regular with i.c craft. In the above post, Paul used a fishing rod, which probably might not reach far enough in Lake Windermere. Other methods are a tennis (or rubber ball) attached to length of fishing line, a friend with an electric tug (or other tow boat) and is there access to a rowing boat? I've even seen an additional small auxiliary electric drive fitted. Don't think about swimming out for the model, there was a drowning in the US earlier this year with someone attempting to rescue a model boat.

My thoughts would be to abandon the i.c system and fit electric in this day and age. I think many of us are glad of the reliability electric models have brought to the hobby.
5 November 2015 at 19:38 #61207
Malcolm Frary
Participant
@malcolmfrary95515
On one of my visits to Fleetwood last year for a nostalgia afternoon there was a great collection of vintage IC boats. The really noticeable feature of the afternoon was the number of skippers waiting for their boat to either drift in or be rescued having had the engine stop for whatever reason. These were all experienced guys who presumably were a long way up the learning curve. In an oblong hole in the ground, a stopped boat is not usually a big problem, but Windermere is a big lake, and one of Murphys laws implies that a boat will always drift the wrong way.

Take the gentle early learning steps with electric power. When you have the boat basics sorted, then is the time to go for something more ambitious.
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