Prototype build of ELLIE

[Paul TParticipant @pault84577]

Thank you Bob

You wouldn't believe the amount of pms that I have had urging me to get back on line before you get too carried away with your fire breathing monster.

I am impressed with the dropped nose attitude of the foredeck as it does lend the model a certain shark quality, how about some teeth (something along the lines of the P40 flying tigers) and chrome pipework.

Paul

[IAN_IParticipant @ian_i]

Hi Bob and Paul..

Having a great time watching all the development on the builds all the best to you both and good health for the new year.

Best regards,

Ian

[Bob Abell 2Participant @bobabell2]

Thank you Ian, we really do appreciate your kind comments and it`s nice to know that you are enjoying the thread

We wish you yourself a merry Christmas and all the best for the new year

Paul and Bob

[Paul TParticipant @pault84577]

Ian

Thank you and if you liked the Ellie build then you will love the upcoming Brutus project as the model has an unusual shape that is going to drive Bob bananas as he builds it.

Paul

[Bob Abell 2Participant @bobabell2]

Hi Paul

It's not the kinky boat shape I'm worried about……Only hope you don't call for a Tea pot on top !

Bob

[IAN_IParticipant @ian_i]

Hi Paul..

Yes I am watching all the builds looking great….

and the banter is as good as Morecambe and Wise…lol

Great work best wishes and Merry Christmas,

Ian

[Bob Abell 2Participant @bobabell2]

Thank you, Ian

Morecambe and Wise, hey?

Just to remind you, chaps…..I wish to say that this model is made with the right bits, but not necessarily in the right order!……Boom! Boom!

Another WIP picture, showing the feathers and embryo rudder set……..Like it yet, Larry?……Sure do, Capt

It may be an ugly duckling at the moment, but one day it'll be a Swan!

Bob

[ashley needhamParticipant @ashleyneedham69188]

Bob. Love the rudders. Bit worried about the weight you are carrying on top there. I was going to suggest balsa for the fin but that's not much of a weight saving. I would like a sort of curved sharks fin style on the back myself personally (not a suggestion, just voicing my likes). MIGHT suggest a bath stability test sooner rather than later??

What do you intend to power this with?? needs to be a bit pushy to provide sufficient go to match the fabulous period upperworks.

Ashley

[Colin BishopModerator @colinbishop34627]

Beginning to look a bit like Steampunk now…. You could really go to town on it then.

Colin

[Bob Abell 2Participant @bobabell2]

Colin. Have you got a picture of Steampunk?

It`s a new one on me

Ashley

The fins are balsa and so is the hull structure and the skin is only 1mm

Even the engine is mainly balsa…..So we stand a fighting chance?

You being well up on the latest motors, what do you recommend?

I`m not looking for planing, just the impression of uncontrolled power!

Bob

[Bob Abell 2Participant @bobabell2]

Shop floor to Boffin`s office

The weight of the SloMo cruiser as per latest picture, without the motors, propshafts and batteries etc is a mere 4 lb

Will it fly?

Bob

[ashley needhamParticipant @ashleyneedham69188]

Bob, that IS a surprise!! Are you having one or two props cant remember..have you mentioned this?

I don't have that much fast boat experience. I would bung in an MFA850 motor on 12v and use an X50 prop, or possibly a slightly smaller prop if torque steer is an issue.

BUT I know that the 700aabb x-turbo double supercharged noedominium colbat 6 pole motor is favoured by many with a 30s double-whammy Lipodedumdoodoobedoo for the battery.

Ashley (always technical)

[Paul TParticipant @pault84577]

Hello Captain

Steampunk is a type of science fiction technical art based upon the books of Jules Verne a good example would be the steam driven spider in the film Wild Wild West,

I can see where Colin is coming from and would agree that your SloMo does have all the hallmarks of Steampunk.

There is no question of your SloMo not working but you might have to be inventive with the trim when she turns at speed. For the impression of uncontrolled power you could fit a effects unit that sounds like a pair of lusty V8s.

The chief executive has just looked at your latest photos and has given the project a thumbs up as she thinks the twin rudders are the dogs bo…cks so you now have the official seal of approval and extra funding will be made available.

Paul

ps the extra funding in the form of a postal order to the value of £1.50 will be issued in the new year

Edited By Paul T on 22/12/2013 12:43:27

[LARRY WHETTONParticipant @larrywhetton68737]

Hi Bob ,

Its growing on me, nice bit of rear end work, you are good at rudders, such a lot of effort to push

a supped up Thames lighter,……

have thought where you are going to rivet ?..

Paul , nice to see you back, hope you getting better have a good Christmas to you and your family …….

cheers Larry…..

[Ian GardnerParticipant @iangardner62867]

Wavemaster with 700 motor and 3s lipos through an Electronize esc. Good enough for me!

Ian

[Bob Abell 2Participant @bobabell2]

Thanks Larry

Don`t worry, I`ll be having plenty of rivets shortly……Not decided on where yet!

Paul…

Pleased that I have got Jane`s seal of approval, she recognises quality when she sees it!….. but don`t understand the Postal Order mystery?

Don`t think there will be any problems with turning stability, as it`s not top heavy

What about the motors?……..I think two heavy powerful MFA850 motors is the way to go……Would they be too big for Brutus?

Saw a big Graupner speedboat today at the pond. It had three water cooled 550 motors driving thru reduction gearboxes to only 40mm props. It sounded lovely, like a car engine, but don`t see the reason for the gearboxes?

The motors and props looked too small, in my opinion

Just food for thought

Bob

Edited By Bob Abell on 22/12/2013 16:00:34

[Bob Abell 2Participant @bobabell2]

Ian G

Very similar

What is the benefit of having Lipos?

What is the length and all up weight of your model please?

Thanks….Bob

[Ian GardnerParticipant @iangardner62867]

Hi Bob,

Here is the info you requested. The Wavemaster is 33'' x 11.5''. The all up weight of my boat is 7.5lb but this is with two batteries. I did this to even up the trim and give longer running times. The motor is a Graupner 700BB 9.6v with a 35mm plain prop.

One benefit of Lipos is that they will deliver the power the motor asks for whereas Nimh batteries will drop off when a lot is demanded of them. For instance, in my Rapier, a 12v Nimh dropped from 12v to 9v when full power was asked, as measured with a wattmeter in the bath. This was a revelation to me and it's something to do with internal resisatnce I think. There are folk on here who will know much more about this than me, of course.

Another benefit is weight saving- approximately half the weight of a Nimh. I use 2x 2650mah 3s (11.1v) batteries in this boat wired in parallel giving around 5 ah and a run time of about 20mins, mixed running. The motor draws around 16amps with this setup, again measured witha wattmeter. You do need to do a bit of research with managing Lipos and invest in a suitable intelligent charger if you haven't used them before, but I use my charger for everything now- it has replaced a draw full of miscellaneous plug in and Delta peak chargers gathered over the years.

Finally, I found the couplings sold by Model Boat Bits, aluminium and rubber, to be quieter and more able to transmit the power than the normal Huco type.

With regard to 850 motors and 700's, I have tried both. I don't use my 850 although on 14.4v it was much better.

The boat below had an 850 running on 14.4v- can't remember prop size- probably around X40. It now has a 700BB.

Hope some of this helps,

All the best,

Ian

[Paul TParticipant @pault84577]

Red Leaders triple engine layout and partially fitted electronics.

Another view of the shafts going below the electronics panel.

Triple rudders

[Bob Abell 2Participant @bobabell2]

Thank you, Ian for your very informative reply!

Don't fancy the Lipo route, they seem to be the work of the Devil!

My model looks about 10 lb all up weight with one 12v battery

I think two 700BB's sounds ok and just hope for the best?

In the meantime a few visits to the pond will be worthwhile and ask a few more questions

I think I need to get the model on the water, to make an educated guess for the motor choice for Brutus?

Thanks for your post and wish you all the best for Christmas and the New Year

Bob

[Dave MilbournParticipant @davemilbourn48782]

Paul
Very neat. I'd be interested to see the connections to the rudder tiller arms.
DM

[Bob Abell 2Participant @bobabell2]

Very nice, Paul…..Looks a bit fiddly getting to the motor couplings etc though?…..What motors are they?

What is the overall weight with batteries

Why are you using six fuses?

More pictures, please?

Apologies for asking all these questions

Bob

ps…..Just noticed that 700BB motors are about £75.00 each!……..Think again, Bob!

 

Edited By Bob Abell on 23/12/2013 18:42:42

[Paul TParticipant @pault84577]

Bob

The couplings are the flexible type so access and fitting is straightforward, the motors are all Graupner 500e ( I haven't fitted the suppressors yet)

I haven't built the batteries so I cant tell you the total weight.

Why six fuses, Its the correct method of installation as there are three fuses on the main distribution board (one for each of the ESCs) then each motor is protected by its own fuse.

Don't worry about asking questions.

Paul

ps. There is an easy solution to your 700BB problem.

[Bob Abell 2Participant @bobabell2]

Thank you Paul

I`ve never used two fuses per motor before, but it looks good!

Tell me about the easy solution and would they be suitable for Brutus, please?

What does your boat weigh at present?

Bob

[Paul TParticipant @pault84577]

Hi Bob

The first fuse on the power distribution board protects the ESC (as well as protecting the motor) but the second is purely to safeguard the motor.

I'm sorry but I was being flippant as my easy answer to the 700BB is not to buy one. From my point of view a pair of 600s will be fine but you could always hunt on fleabay for some MFA 800s

I've not weighed the model yet but I will have a go tomorrow.

Paul

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