60watt | 28/05/2009 21:34:51 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 253 forum posts 14 photos |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
60watt | 28/05/2009 21:38:28 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 253 forum posts 14 photos |
Edited By 60watt on 28/05/2009 21:46:26 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Barry Foote | 28/05/2009 21:52:51 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 161 forum posts 93 photos | Oh my......Confusion reigns.........Not having much knowledge of electronics all that means absolutely nothing to me, although I do understand the principle that the prop will slow the motor down so a gearing will increase it's speed... | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
60watt | 28/05/2009 23:32:31 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 253 forum posts 14 photos | The figures say you need to run the 540 shaft up to 7,000RPM - 10,800RPM on 6 volt
A 775 requires 3600 to 5000 RPM 800 requires 2600 to 4290 rpm on 12 volt .
The lower figure is at maximum motor power and the upper RPM figure is at maximum efficiency.
They also show an 800 and 775 on 12 volt are like a 540 already geared 2.3:1 and 2:1
A 900,from memory, is 1,000 mNm stall torque,540 is 190mNm so the 900 is like a 540 on a 5.5:1 gear.
2000RPM figure for the 63mm is only an educated guess and if correct you can calculate the gear ratio it would need maybe between 3:1 to 6:1.
You are quids in if you opt for a direct drive 775 and pick a prop to suit.
Edit
I spotted an error on the 775 data.-not my mistake.The speed at max eff. should be around 5000 RPM for the figures to tally.Copied it from here
Edited By 60watt on 28/05/2009 23:36:23 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Barry Foote | 31/05/2009 15:14:14 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 161 forum posts 93 photos | Onto some detail for a change. I have started to build the main superstructure, planked the bulkheads in the galley, made up a workbench and started the stove, which will be finished when I know what type it would be. Also made up a kitchen wall unit, which has to be painted white.
Edited By Barry Foote on 31/05/2009 15:15:18 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Peter Fitness | 01/06/2009 01:35:59 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 510 forum posts 215 photos | Looking good. What did you use for the cooktop, Barry?
Peter. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Barry Foote | 01/06/2009 07:49:32 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 161 forum posts 93 photos | Peter,
1mm ply, carefully cut out. A coat of sanding sealer and gloss black. This will be followed by matt varnish to dull it down. The rest of the worktop is done with a product I hardly ever use.....plastic card.. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Peter Fitness | 03/06/2009 05:21:06 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 510 forum posts 215 photos | It looks good, Barry. Will it glow when you turn it on?
![]() Like you, I haven't used plastic card / styrene sheet much either, apart from the Model Slipway kit of HMCC Sentinel. However, I believe it has possibilities in certain situations, such as deck superstructures, as it is very easy to obtain a good paint finish. Much easier than wood which requires much filling etc to hide the grain.
I am seriously considering using styrene sheet for all of my next project, an Armidale Class patrol boat of the Royal Australian Navy. I think it should give a good representation of a metal (aluminium) hull.
Peter. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Barry Foote | 03/06/2009 09:44:55 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 161 forum posts 93 photos | Peter,
Only once did I make a complete model using plastic card and I totally lost interest in it, long before it was finished.......Never again...As for a glowing cooker range.....well now there is a thought!!
Barry | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Barry Foote | 20/06/2009 12:54:38 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() 161 forum posts 93 photos | A few more pictures to bring us up to date.
I have started attaching the rubbing strakes, very slowly to avoid splitting the wood. Also completed some of the galley detail. As little of this area will be seen on the finished model, there is no need to go over the top on detailing.
![]() |
Please login to post a reply.
Want the latest issue of Model Boats? Use our magazine locator link to find your nearest stockist!
Make sure you never miss out on the latest news, product reviews and competitions with our free RSS feed
We welcome well written contributions from Website members on almost any aspect of Model Boating with a particular emphasis on practical hints, tips, experience and builds.
In order to maintain a consistent standard and format, all suggestions should first be sent to me by Personal Message for approval in principle. Only a very limited amount of time is available for editing contributions into a suitable format for placing on the website so it is important that the material is well presented, lucid and free from obvious spelling errors. I think it goes without saying that contributions should be illustrated by appropriate photos. I shall be happy to give advice on this.
The Member Contribution area offers space for short informative mini articles which would not normally find a place in Model Boats magazine. It is an opportunity for Website Members to freely share their expertise and experience but I am afraid that virtue is its own reward as there is no budget to offer more material recompense!
I look forward to receiving your suggestions.
Colin Bishop - Website Editor