Formidable LT100 GRP Boat Kit

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Formidable LT100 GRP Boat Kit

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4 December 2015 at 01:33 #61722
Graeme Linskey
Participant
@graemelinskey75588
Hi there,

Just picked up the above Model GRP Hull already built to a very high standard it was made for steam but the builder made it electric..its has the water tank built in forehead' what would be the ideal power plant for this model in electric ,prop size ,motor and battery,

I believe its an early kit with all the stock parts fitted well over a thousand for a kit? ! do I keep the stock prop and 540 motor thats fitted or go different i

thanks

Edited By Graeme Linskey on 04/12/2015 01:34:52
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4 December 2015 at 01:33 #2529
Graeme Linskey
Participant
@graemelinskey75588
J hemmens
4 December 2015 at 08:25 #61723
Dave Milbourn
Participant
@davemilbourn48782
I wouldn't use a 540 unless it was geared down. My choice would be the low speed version of the 775 from Component Shop **LINK** A MFA 800 might also do the job well – both driving the prop direct (ungeared).
The prop supplied for a steam engine will likely be the right diameter but very coarse pitch; you could fit a finer pitch one.

DM
4 December 2015 at 09:51 #61727
Colin Bishop
Moderator
@colinbishop34627
As Dave says, steam plants tend to be high torque/low speed. Electric motors are more in the opposite direction so for the same diameter prop its best to either gear down or fit a finer pitch prop which will be better matched to the motor speed.

Colin
5 December 2015 at 20:58 #61813
Graeme Linskey
Participant
@graemelinskey75588
thanks for the link that motor looks ideal low current draw doesnt give the can size will that fit in a 540 mount I wonder
5 December 2015 at 23:31 #61821
Dave Milbourn
Participant
@davemilbourn48782
No. It's a bit bigger (hence it starting with a 7 and not a 5).

DM
6 December 2015 at 09:21 #61830
Dave Milbourn
Participant
@davemilbourn48782
From the link I sent, click on the blue text "Learn More". If you then left-click your mouse over the small diagram on the right underneath the main photo a fully dimensioned drawing of the motor will appear. You can enlarge this if necessary. This motor is also available with a mounting bracket.

DM

Edited By Dave Milbourn on 06/12/2015 09:22:48
6 December 2015 at 19:42 #61844
Graeme Linskey
Participant
@graemelinskey75588
yep got it thanks….is it better to have a 4 bladed prop or a 3 bladed prop if i worked out the size and pitch so they both came out approx the same propulsion wise are they both as efficiencent or is a 4 blade more so or visa versa or just for asthetics
6 December 2015 at 19:52 #61847
ashley needham
Participant
@ashleyneedham69188
Aesthetics. No doubt some ~~will~~ would argue about this statement, but..

For the boat you are proposing to electrify, an X pitch two blade plastic prop would no doubt suffice quite well and be really cheap, but look rubbish.

Ashley
6 December 2015 at 22:05 #61852
Graeme Linskey
Participant
@graemelinskey75588
Ashely cant do a plastic prop as you say it would look ……not good
7 December 2015 at 08:39 #61853
Dave Milbourn
Participant
@davemilbourn48782
Graeme

At that speed it's not going to make a lot of difference either way, so I suggest you use the same number of blades as the prop which was originally supplied.

Dave M
7 December 2015 at 08:41 #61854
ashley needham
Participant
@ashleyneedham69188
Graeme. I was simply saying that almost anything will do to propel this boat, you should decide what sort of prop to fit on aesthetics . The manufacturers website has loads of photos, one of which is of a 4 bladed prop fitted. No idea what size but unless it suggests a size then you can gauge it on the space provided to fit the prop.(viz. looking at the picture)

Ashley
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