LORRAINE by a butcher

[lnvisiblemanParticipant @lnvisibleman]

OK all, I have roughly fitted the fastest of my motors into the hull and run a few tests.

Unloaded rpm is 4800, With a 60mm prop running in my paddling pool I am getting 3150 rpm. That's about 66% if my maths are right.. With a 50mm prop, I am getting 4000 rpm, about 82.5%. Am I right in saying that the 60mm prop is the better of the two?

Some time became available so I have had a play with the filler, getting the hull to a decent finish, and got some paint on the cabins.

Still loads to do but she is starting to look like a boat now and even floats!! That is always useful in my experience.

[lnvisiblemanParticipant @lnvisibleman]

Life has been very trying lately but not to worry, eventually I got round to doing a bit more on Lorraine. The next job was to lay the decking veneers but it was not to be a simple job. I tried all manner of adhesives without success. Fortunately, there was some excellent advice available from dubious sources, and the problems were solved. The decking is now laid and a bit of paint slapped on the cabin. A lick of colour soon changes the look of things.

More to come.

[lnvisiblemanParticipant @lnvisibleman]

YIPPEEEE !! She floats .

[Diede van AbsParticipant @diedevanabs87670]

Lookin' good, invisible dude!

Now off for some detailing etc.

[Amy jane SeptemberParticipant @amyjaneseptember49770]

Great stuff, sir

She looks like she's sitting nicely in the water. Always good to see them where they belong!

[Ian GardnerParticipant @iangardner62867]

Hi,

Having just finished my Vic Smeed Veleta I was toying with the idea of building Lorraine- but it wouldn't fit in my car easily. Now that you have yours in the water, is it possible to say how much she weighs? Vic Smeed stated it would be around 35lb in his original article. I was wondering about building a reduced size version- around 0.8 the original (1:20) and knowing the displacement would help.

All the best,

Ian

Edited By Ian Gardner on 16/05/2014 09:55:42

[lnvisiblemanParticipant @lnvisibleman]

Thanks Amy J. It's nice to gain the approval of a fellow hacker !

Ian

As she stands ( or floats ) she weighs in at just under 28lbs That includes 1.5 lbs. for the motor,11.5 lbs. for 2 x 12v 7.5ah SLA batteries and an additional 2.2 lbs. ballast. The additional fittings will come to around about 2 lbs. as they are all white metal and brass. That will include custom made brass window frames and cockpit surround.

Mike

[lnvisiblemanParticipant @lnvisibleman]

Ian

I do have plans in 1/20, 1/24 and 1/32 if you need them.

[Ian GardnerParticipant @iangardner62867]

Thanks for the information. I'll send a pm.

Ian

[lnvisiblemanParticipant @lnvisibleman]

Hi all

I shall be back to work on my models in the next few days, having had a long break whilst in hospital and recovery.

The basics are finished and as was shown earlier, she floats nicely however I am not impressed with the performance so it's time to spend the kids inheritance on a new motor and esc.

Being quite a large model, I am looking for something with plenty of grunt, around 600w seems a goodly amount, I have been trawling the intawebby thing and just get so confused with the vast array of motors available and yet no clear guidance as to what would suit me best.

Am I right in saying that 1000kv means 1000 rpm per volt applied? If so then I suppose I need to get below 1000kv in order to use my 12v batteries. As I have mentioned before, I want loads of torque not revs. A gearbox is something I can live without thanks.

The batteries used are 2 x 12v 7Ahr and will continue to be used as they are just the right weight to act as ballast. We don't want her bobbing around like a cork in a bowl.

I am hoping that someone will be able to advise which if any of these would be suitable. Or even come up with a good suggestion,

.**LINK**

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[Amy jane SeptemberParticipant @amyjaneseptember49770]

Hello

A couple of thoughts:

A low kv out runner will give you the best combination of low revs and high torque, in runners tend to be more high speed, low torque

Are you running your batteries in series or parallel? The 1300 watt will give loads of grunt at 24 volts , but the esc wont come cheap! you may have trouble pulling the required amps on 12 volt, if running in parallel.

Good luck!

('spose a weed eater engine is out of the question….)

Edited By Amy jane September on 29/06/2014 09:35:57

[Amy jane SeptemberParticipant @amyjaneseptember49770]

Another thought .Gell cell batteries?

May not be able to deliver the goods, and may have a very short life…

[lnvisiblemanParticipant @lnvisibleman]

Posted by Amy jane September on 29/06/2014 09:32:12:

Hello

A couple of thoughts:

A low kv out runner will give you the best combination of low revs and high torque, in runners tend to be more high speed, low torque

Are you running your batteries in series or parallel? The 1300 watt will give loads of grunt at 24 volts , but the esc wont come cheap! you may have trouble pulling the required amps on 12 volt, if running in parallel.

Good luck!

('spose a weed eater engine is out of the question….)

Edited By Amy jane September on 29/06/2014 09:35:57

Amy

I thought weed was for smokinig, not eating ?

The batteries can be wired either way, ad a 24v esc is available at a reasonable price I'm sure, just a matter of finding the right chinese seller on fleabay.

Mike

 

 

 

Edited By lnvisibleman on 29/06/2014 10:26:23

[Amy jane SeptemberParticipant @amyjaneseptember49770]

Ha ha ha, I like it either way!

[lnvisiblemanParticipant @lnvisibleman]

I would love to switch to lipos but they are so expensive and I don't really understand the 20c bit What does that mean?

[Andy CParticipant @andyc56856]

Hi Mike

Had a quick scout around and found an interesting post here **LINK**

Gives a good deal of info on Lipos, will have to have a good read myself as Brushless and Lipos seem to be the future.

Andy

[Andy CParticipant @andyc56856]

Just had a look down the thread on that post, seems I may need to put a bit more time aside to read through it.

[Dave MilbournParticipant @davemilbourn48782]

Posted by lnvisibleman on 29/06/2014 10:48:57:

I would love to switch to lipos but they are so expensive and I don't really understand the 20c bit What does that mean?

The C rating refers to the maximum current which can be supplied by a pack compared with its capacity. For example, a pack whose capacity is 3300maH (or 3.3AH) and which is rated at 20C can supply a maximum current of 20 x 3.3A= 66A. Contrast that with a Sealed Lead Acid battery of 4AH, where you would be lucky to get more than 1C. In other words if you intend to use a brushless motor which draws tens of amps then you are wasting your time trying to run it from a normal SLA battery. It would be like trying to run a Formula One engine on a teacup full of petrol, connected by a 1/16" diameter tube. Conventional SLA batteries just aren't designed for high continuous discharge rates – you need the type called "leisure" or "deep discharge" batteries which power mobility scooters and caravan electrical systems.
You could run a brushless motor from NiMH cells – they're safer to operate and you'll get far more charge/discharge cycles from them. Price for price there's not a lot of difference between NiMH and LiPo. For example Component Shop have a 12v 5000maH Sub-C NiMH pack at about £42, while a 3S (11.1v) 5000maH pack is £45.50.
IMHO you'd be better off putting a big low-current brushed motor in there with a 24v supply and a stonking great big prop (75mm+ in diameter). As I said before, this isn't a planing hull and I suspect the only thing which will increase with added power is the height of the bow-wave.

Dave M

[lnvisiblemanParticipant @lnvisibleman]

Hi all

Due to the NHS being totally unable to satisfactorily clone body parts, I have had to take a bit of time off from build works, however, as the saying goes, " I'M BACK !! "

I've been spending a bit of time with the paint brushes and tried to make the hull more presentable. Also had a play with some fittings form the "Cheap but reasonable quality" bin. Had to make up a few bits for myself and I'm fairly happy with the results.

Not really a great deal more I can do now except start the next one. I hope I learn as much next time as I did this time.

Mike

[Bob Abell 2Participant @bobabell2]

That looks a very nice model, Mike

Well done

Bob

[ashley needhamParticipant @ashleyneedham69188]

Mike very nice. Good colours befitting the style of boat, sufficient detail to give it the right look and the wood deck sets it all off a treat. Well done.

Ashley

[Amy jane SeptemberParticipant @amyjaneseptember49770]

That's looking really nice, Mike! (I'm glad the boat's not invisible too…)

[Amy jane SeptemberParticipant @amyjaneseptember49770]

That's looking really nice, Mike! (I'm glad the boat's not invisible too…)

[Amy jane SeptemberParticipant @amyjaneseptember49770]

woops

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