MOD police launch

[PhilbyParticipant @philby]

Hi there

I have been hanging around this forum for a little while now and decided to take the plunge and order a kit

This is the kit that I have ordered for when I return to the UK

Question is So instead of Using a brushed motor as in the spec can I go brushless and if so what one would you recommend

Phil

[PhilbyParticipant @philby]

[PhilbyParticipant @philby]

[ashley needhamParticipant @ashleyneedham69188]

Phil. It’s only a small thing with a small but feisty brushless 280, and I am not sure why you would want to go brushless.

Obviously you could replace the motor with a small brushless and up the power to go faster, is this what you want to do?

The 280 is quite small and relatively light already.

Ashley

[PhilbyParticipant @philby]

Hi Ashley

No did not want to go faster but I thought brushless might be better and less maintenance

Phi

[Ray Wood 3Participant @raywood3]

Hi Phil,

No need really , I built the prototype model kit of the Riviera launch for J Perkins which is the same hull with a brushed 400 and that really too much power, unless you want a mach 2 Police Boat 😮

Regards Ray

[Charles OatesParticipant @charlesoates31738]

I agree with all the above, also I think that a scale police boat flying around like a racing boat can look very odd.

Charles

[PhilbyParticipant @philby]

Thank you for the replies and help

So I will order the brushed motor and go from there

Question

would 3S Li-po be ok with this setup or stick with the 2S

Phil

Edited By Philby on 25/10/2020 09:06:30

[Ray Wood 3Participant @raywood3]

Phil,

2 cell Lipo will be fine maybe 1300 size, it is a very small & narrow hull, I had trouble getting the gear in.

Bigger boats are generally much easier to fit out !!

Regards Ray

[PhilbyParticipant @philby]

Hi Ray

Thank you for the Information 2S 1300 it will be

I have the SLEC Swordsman on the building board at the moment in the UK which use the 3S Lipo

Phil

[Dave MilbournParticipant @davemilbourn48782]

Philby

The voltage of the pack required depends primarily on the rating of the motor rather than the size of the model. Of the three 280-sized motors which MFA supply only one will take 11.1v (i.e. a 3S LiPo pack) – the others are maxed at 3v and 6v respectively. This one draws 0.3A at maximum efficiency so you wouldn't need a very high capacity (and therefore physically large) battery pack for a decent morning's running with a 25mm 2-blade prop.

MFA 280/1 motor

If you apply excessive voltage then a brushed motor will run faster than intended, wear out the bearings quickly and likely burn out the brushes. Not expensive to replace at £2.50 each but potentially dangerous if it catches fire.

The SLEC Swordsman was designed for a larger brushless motor and prop – being a third as big again as the model you've chosen. Ask me how I know…

Dave M

[PhilbyParticipant @philby]

Hi Dave

Thank you for the reply it all makes sense

So I will need to choose the motor and then select the battery pack to suit the motor

So a 2S LiPo pack as Ray has suggested will be suitable for the 280/5 motor at 6volts

 

Phil

 

Edited By Philby on 25/10/2020 21:58:16

[Dave MilbournParticipant @davemilbourn48782]

280/5 motor is rated to 6v.

2S LiPo pack is 7.4v. Your choice.

As our US colleagues might say, you do the math.

DM

[Paul TParticipant @pault84577]

I will stick with lumpy old brushed motors and petrol engines.

Some might call it old fashioned.

Jane would have called it stubborn.

[Chris FellowsParticipant @chrisfellows72943]

Being fairly new to this hobby I went straight into brushless. Have to admit though that now having a couple of boats with brushed motors I'm pretty impressed with how well they go.

First choice is still for brushless though just for the nice engineering!

Chris

[PhilbyParticipant @philby]

Hi

Whilst away I ordered the manufacturer’s recommended motor and parts. It’s a small motor I must admit

So now I have looked at the parts and the kit I noticed that 3mm ply deck support is warped.Would this be usable if pinned to a flat surface and the bulkheads glued to it to take out the warp or do I need too cut out a new one

Any advise will be appreciated

Thanks in advance

Phil

[Ray Wood 3Participant @raywood3]

Hi Phil,

Yes if you can lay the warped subdeck onto a stout board covered by clingfilm to keep it flat and not to get glued down you should be able to pin the deck down over the sub bulkheads until the glue dries.

The deck assembly relies on matching the hull and upstand coaming for being watertight, so it's worth checking how flat the top of the hull has turned out so they match.

The Riviera launch I built on the same hull has a varnished wood deck as a feature so I had to use clips as per the attached as I didn't want loads of pin holes but your deck will be painted so easier to fill the pin holes. The whole design works and is well drafted and cut out kit but I doubt the designer ever built a model boat before OMHO !

Hope that helps

Regards Ray

[PhilbyParticipant @philby]

Thanks Ray

I will give it a go

Phil

[neil hpParticipant @neilhp]

i do believe that this is the same boat that you have ordered……..

a nice little build log from a guy on a model forum. might be worth you looking through and reading it for some information and help.

you will have to join the forum but it would be worth it to see the build progress.

Police/Pilot Boat (thercmodelboatforum.com)

[PhilbyParticipant @philby]

Niel

thank you for the information I will certainly give it a look

Phil

[PhilbyParticipant @philby]

So this is my boat at the present

..

The problem that I am having is where the waterline should be located

As the instructions do not indicate the location only have the pictures (see start of thread)

question is how too find position of waterline

TIA

Phil

[ashley needhamParticipant @ashleyneedham69188]

Phil. Position of the waterline is not as critical in a planing vessel as it is on a displacement hull, as the boat rises out the water when in motion by quite a bit.

I would go with the picture, roughly….andestimate…you can’t go far wrong?

Ashley

[PhilbyParticipant @philby]

Ashley ''

so I went with the drawing,

and this is where I am with it at the present

Phil

[PhilbyParticipant @philby]

So a little bit more has been done to make it ready for a test on the water

Project not complete yet but it floats and the bow does plane

Two pictures taken while testing at Chantry Model Boat Club Bluewater

Phil

.

[Ray Wood 3Participant @raywood3]

Hi Phil,

Your boat looks very good, glad to see it went well I think that your Police Boat & the MTB are the best superstructures for that hull design, but I'm still dubious of the deck coming off for access ! I don't think it was designed by a model boater !!

Regards Ray

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