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Author Topic: Aerokits 46' crash tender  (Read 6755 times)

olly4950

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Aerokits 46' crash tender
« on: August 24, 2012, 11:03:11 PM »

Hi,
Would like to know what setups have you used in your 46' Aerokits crash tender?
Should I put one propshaft in or two?
Just bringing a old girl back to life.
Many thanks
Olly4950
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red181

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Re: Aerokits 46' crash tender
« Reply #1 on: August 24, 2012, 11:47:33 PM »

just wondering is the huntsman project scrapped?
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olly4950

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Re: Aerokits 46' crash tender
« Reply #2 on: August 25, 2012, 09:19:54 AM »

Hi red181

The Huntsmen is finished and sailing happily around my local pool.
Video on youtube soon.
She is now striaght shafted with a T 600 motor in it, ballraced propshaft.
Decided to renew propshaft thus filed boat to allow less angle on propshaft.
She is very fast now.

Thanks to everyone for there advise on this old girl.
I am a big fan of Aerokits and someone was selling a 46" crash tender, I have the 36" version.  Always wanted the bigger one.
So now I have one and this is my winter project. Bought the windows/frames and fittings many moons ago but feel that the
white metal fittings might have to be replaced with plastic or home built ones.

Just need to know at this stage if it should be one motor or two? and I need to make some bulkheads and cabin roofs.

One other thing is that the chine rails look very big for the boat, what size should they be?



Regards
olly4950
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red181

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Re: Aerokits 46' crash tender
« Reply #3 on: August 25, 2012, 11:03:48 PM »

great news with the hunts, get some video, would love to see it,

now the 4 footer fireboat, funny we have the same boats, you may be interested in this!

http://z13.invisionfree.com/St_Helens_Model_Boat/index.php?showtopic=30

I was going to do a build blog on mayhem, but it started on the st helens model boat club website instead It is a lovely big lake, although a 45 min journey away, it gives me the chance to strech the legs of my Huntsman, and this Fireboat when finished :-))
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olly4950

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Re: Aerokits 46' crash tender
« Reply #4 on: August 25, 2012, 11:10:34 PM »

Unable to use your link.
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Tug-Kenny

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Re: Aerokits 46' crash tender
« Reply #5 on: August 26, 2012, 11:59:02 AM »


It appears you have to be a member to see the postings on there.


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Despite the high cost of living   .......... It remains popular

red181

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Re: Aerokits 46' crash tender
« Reply #6 on: August 26, 2012, 10:16:15 PM »

hmm, didnt know that, it (the forum) was changed recently as general public was able to post without joining up, which led to some "suspect" posts,

maybe I should do the build blog on mayhem,  :} in summary, we have opted for twin screw, brushless (I have the smaller 3 footer on single screw), the shafts are removed from the motors, and the M5 propshafts go straight through the motors eliminating any belts, gears, couplings etc, the ultimate direct drive!

It runs on two seperate systems, meaning each motor has its own esc, and each motor has 2 x 2 cell 5000mah lipo, not tried nimhs yet, each motor has a water cooling plate, which exit through both exhausts.

We have had eagle tree data logging on it, it does 22mph, didnt want it as fast as the huntsman, its far more efficient which has encouraged me to change the Huntsman to twin screw next year, as its well over due a refurb, in the same way.

As usual with me, its over the top! We did some testing with various size props, from X45 to X55, X52.5 being best overall performance, speed/amp draw/run time, today went to Haydock show and had a long talk with Simon from propshop, two cleaver props are ordered, and will be counter rotating.

Currently doing fittings and paint, hopefully finished in next few weeks! :-))

  






I would not hesitate now to do twin screw, this is my first attempt at it, the only problem is you have to buy two of everything!, any questions, just ask!

First water test, rudder throw was none existant, so had to take it easy!
http://www.youtube.com/watch?v=W1FShc3Mvuk&feature=relmfu

Paul
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TheLongBuild

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Re: Aerokits 46' crash tender
« Reply #7 on: August 26, 2012, 10:23:44 PM »

What ESC's  are you using ?.

red181

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Re: Aerokits 46' crash tender
« Reply #8 on: August 26, 2012, 10:26:23 PM »

Turnigy 60amp, water cooled and reversing, had a couple of problems getting them,  and the relatively cheap out runners balanced, the programming is really awkward, and one of them periodically wants to be reprogrammed, but they work fine, so far!
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TheLongBuild

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Re: Aerokits 46' crash tender
« Reply #9 on: August 26, 2012, 10:35:40 PM »

Thanks
The combination of BRushless to Esc just seems a minfield..

Should shift some on 2 however.

red181

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Re: Aerokits 46' crash tender
« Reply #10 on: August 26, 2012, 10:54:56 PM »

reversing brushless esc's are somewhat limited in choice, brushless motor prices have collapsed over the last few years, making them as affordable as graupner etc  brushed motors, pity the esc's are not the same as they remain expensive, and unless you buy expensive, like castle creations, are not repairable.

This sort of setup in a large scale boat isnt very common, hence most brushless esc's are forward only for the racing boys who dont need to go in reverse  :}

I like using brushless, having rc helis and planes, I suppose I am more confident using them, but the available info for boats (excluding racing stuff) is very limited, I feel brushless technology in boats  is still in its infancy so there is still a lot of trial and error :((

Come over to Taylor Park in St Helens sometime, quite a few of us are running brushless with great success :-)), cant wait to get this Fireboat finished as the testing and set up is completed, so I know it runs!!

(sorry to hijack the thread Olly) 
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triumphjon

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Re: Aerokits 46' crash tender
« Reply #11 on: August 27, 2012, 07:47:54 AM »

red , what shafts are you using please ? our own crash tender ( 34 " ) is going brushless over the winter months but needs another shaft as the top bearing has failed ! 1
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red181

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Re: Aerokits 46' crash tender
« Reply #12 on: August 27, 2012, 08:59:47 AM »

tough one to answer! They are M5, they have glacier bearings at water end, these are lubricated by water, in hindsight, I think the standard Aceteal (spelt wrong?) would have worked, But I knew they would be rotating fast. Top end at motor, well this is where things go strange, top end of prop tube has a ballrace, then the water cooling block has a ballrace, and the motor itself has front bearing, as the shaft goes straight into the motor, if you know what I mean.

Initially we had low rev vibrations with both motors, so we stuffed an aceteal bearing halfway down shaft tube, as they are 13" long, the 4 foot fireboat is quite a big boat, that coupled with a slight revision on the motor mount sorted the vibrations out.

The shafts are also fitted with oilers, I dont do grease in shafts as I believe this causes drag, and on high revs could emulsify, but thats just my opinion I know others like grease.
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spearfish99

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Re: Aerokits 46' crash tender
« Reply #13 on: August 27, 2012, 12:56:02 PM »

The secret with effectively programming Turnigy (Seaking) ESC's is to buy the appropriate program card .  Makes life much simpler to initially program or to change settings without having to use the TX and a series of bleeps from the ESC.  Only about 10 and work on whole series of ESC's from Turnigy
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olly4950

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Re: Aerokits 46' crash tender
« Reply #14 on: August 28, 2012, 01:28:37 PM »

Thanks for the advice.
Does anyone have a copy of the plan please?
There is a Fireboat meet at Branston Park in September
Regards
olly4950
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spearfish99

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Re: Aerokits 46' crash tender
« Reply #15 on: August 28, 2012, 10:09:43 PM »



Location: Northampton
Posts: 14


   
   
Re: Aerokits Crash Tender
Reply #1 on: August 21, 2012, 11:09:49 PM
   
Hi Olly4950

You can buy a plan here if no one has one they can let you have

http://www.lesromodels.co.uk/shop/product_info.php?cPath=85_104&products_id=227


There is also a dedicated web site for model fireboats which is what this is a model of

http://modelfireboats.com/#index.php
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olly4950

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Re: Aerokits 46' crash tender
« Reply #16 on: August 29, 2012, 01:34:42 PM »

Red,
I have seen a similar arrangement on a model boat about a month ago.
Someone at my model boat club, purchased one of the boats you can control at a fair its motors
where held very similar to yours.
I have one shaft in mine,  do I plane down the skeg in the middle of the boats in order to put two shafts in?
Are your motors free floating on those shafts? There just attached to the propshaft are they?
Need to come up and see yours in action.
Regards olly4950
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HS93 (RIP)

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Re: Aerokits 46' crash tender
« Reply #17 on: August 29, 2012, 03:21:33 PM »

Red,
I have seen a similar arrangement on a model boat about a month ago.
Someone at my model boat club, purchased one of the boats you can control at a fair its motors
where held very similar to yours.
I have one shaft in mine,  do I plane down the skeg in the middle of the boats in order to put two shafts in?
Are your motors free floating on those shafts? There just attached to the propshaft are they?
Need to come up and see yours in action.
Regards olly4950

what do you mean by free floating ? and where they brushles motors in the boat at your club ?
Peter
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red181

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Re: Aerokits 46' crash tender
« Reply #18 on: August 29, 2012, 07:34:49 PM »

the motors have the shafts (m5) removed, we then fed the propshaft through the motors, the shafts are held with a double skin effect where they exit the hull for strengh, and also in the bulkhead. The motors are fastened to mounts, which are bolted to the hull, so its all very rigid, I had my doubts it would be so good, as the motors are on the cheap chinese side, and the shafts have to be pretty much dead plumb, the first set wher returned to the supplier as they had been rough cut and where bent, a good way to test the shaft is roll it on glass, A trick I learnt with rc helis, the shafts on them have to be perfect :-))

But got to say, its real good, I cant wait to get the Huntsman stripped and done this way :}
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olly4950

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Re: Aerokits 46' crash tender
« Reply #19 on: August 29, 2012, 09:01:44 PM »

Red,
Many thanlks for explaining more.
The thing I could not understand is of your motors, are they just attached to the shaft?(this is what I ment by free floating) or are they mounted?
You have answered my question.
Do you have a photo of the mount? is it the disc attached to the shaft that forms your mount? or is it the watercooled plate? that forms your mount. Just unable to see it in previous photos.

HS93
The boat with the motors attached to the shafts where brushed motors.

Regards

olly4950
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HS93 (RIP)

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Re: Aerokits 46' crash tender
« Reply #20 on: August 29, 2012, 09:11:45 PM »

Red,
Many thanlks for explaining more.
The thing I could not understand is of your motors, are they just attached to the shaft?(this is what I ment by free floating) or are they mounted?
You have answered my question.
Do you have a photo of the mount? is it the disc attached to the shaft that forms your mount? or is it the watercooled plate? that forms your mount. Just unable to see it in previous photos.

HS93
The boat with the motors attached to the shafts where brushed motors.

Regards

olly4950

then they where not the same as they would of had a coupling they are bolted through the heat sink to the brass mount
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olly4950

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Re: Aerokits 46' crash tender
« Reply #21 on: August 29, 2012, 09:45:29 PM »

Hs93
Many thanks for photo.
Red mentioned that they are fastened to mounts then bolted to hull.
But from your picture, I see that they are bolted to the disc which is soldered to the shaft.
Regards
olly4950
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HS93 (RIP)

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Re: Aerokits 46' crash tender
« Reply #22 on: August 29, 2012, 10:33:16 PM »

we added a bracket that went behind the bolts that held the motor to the disk after we got some vibration on new mounts it will be done differently, remember the fire boat was the first full test, you learn as you go. we did with the Huntsman, and have a swordsman to do before the huntsman gets ripped apart plus a second twin for Paul soon, Brushed or brushless that is the Question.

Peter
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olly4950

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Re: Aerokits 46' crash tender
« Reply #23 on: August 30, 2012, 06:47:18 AM »

I have a Swordsman to refurbish plus a Mtb boat to Build my lifeboat also needs her
superstructure revamping.

Alan
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olly4950

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Re: Aerokits 46' crash tender
« Reply #24 on: August 30, 2012, 07:42:21 AM »

What type of paint and colours are you using on crash tender?
Attached is a esc that I will be using on mine, is this like yours.
Sorry for asking too many questions.
Alan
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