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Author Topic: Dumas Crist Craft Run About Speed boat  (Read 13369 times)

Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #50 on: October 01, 2011, 04:41:45 PM »

Hi to Mad Mike,

Just got my Mtroniks speed controller, wow, " it installed it self, !!!! its that great, excellent kit, WOW !!! Its that fast I dare not use on full throttle on the work bench, and its well worth the money, believe me,and I and use on my Ferrari Hydroplane , great.javascript:void(0);





http://www.youtube.com/watch?v=8Jtkl2IGYAs&feature=colike
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #51 on: October 04, 2011, 11:45:29 AM »





Here's a pic of the hardware, !!! I'm waiting on a cool plate for the speed controller, and the water jacket for the Feigao  motor, the battery is under the front seat, (this is the position in the plans)
 this helps the balance of the craft on the water.





I'ved added LED'S to the dashboard, easy to make up, and I'ved up to a switch, (I'm looking for a micro toggle switch to add to dash, but the ones I've are too big  !!!
I'm going to wire up the lamps, and I may fit a sound card ?later.
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #52 on: October 05, 2011, 03:24:17 PM »

Hi Mad Mike


Thanks for your PM, I've made a silcon seal, and had one seal in my spares box, I also came accross an other prop, how about this brass one ,? I don't know what pitch it is , but looks a sharper curve than the bronze prop on the boat, its the same size 38mm dia,?
waiting for the silicon to cure ? hope it works,
thanks Roy


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MikeA

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Re: Dumas Crist Craft Run About Speed boat
« Reply #53 on: October 05, 2011, 08:02:16 PM »

starting to look the part. I cant say for sure which would be the better prop from here, youl have to run them both to see. what is the prop shaft diameter?
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #54 on: October 05, 2011, 08:14:56 PM »

Hi Mad Mike,

Yer I'll run them both, and see how they perform, the brass prop shaft is 1/8th Dia and the 3 blade prob is 38mm dia, I'm hopping to trial the boat at the W/E.
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MikeA

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Re: Dumas Crist Craft Run About Speed boat
« Reply #55 on: October 05, 2011, 08:25:39 PM »

i hope to get on the lake this weekend. try and do a vid if you can, you will probably need someone to help you.
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #56 on: October 05, 2011, 08:58:14 PM »

Cheers, yer, I got a great club , so I'm sure some one will be about to lend a hand,

thanks for your posts,

 Roy
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Martin [Admin]

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Re: Dumas Crist Craft Run About Speed boat
« Reply #57 on: October 05, 2011, 09:12:15 PM »

Hi Roy,

 Looking good!

 Just looking back at the photos, it maybe the angle of the photo but you might just want to recheck the motor to shaft alignment...
 .....just for me please!   The motor looks canted slightly upwards. Not sure you can do anything about it at this stage but any angle
 between the shaft and motor will rob you of power ( even slightly... even in such a high powered boat! ) which be lost in friction,
 heat, noise and wear.

 ... been there, done that, got the T shirt... started the forum!!!

NB: Yes I do have a major hang up, a ....  fixation!...  regarding motor to prop shaft alignment for several reasons:

      1, I find it very hard to get right.
      2, It can be a very difficult retrofix.
      3, I've destroyed the bearings in a very expensive IC engine.
      4, Wrecked a couple propshafts bearings.
      5, Exploded several UJs
      6, And once embarrassed myself at a show by asking what sound generator a bloke had in his big battle wagon...
          .... when he didn't have one fitted!   :embarrassed:
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #58 on: October 05, 2011, 09:41:18 PM »

Hi Martin,

Well spotted,!!!


Many years ago, when I came to set the outer prop, I  llined  it up to the motor (perfectly I might add) however I left it to set (on it own ) and it had moved off centre to the right by about just under an 1/8th of an inch, !!! , in those days i ran a Dumas 540 and it ran OK,
now look at your line up pic, I think I can move the angle the motor mount to fall in line, however , I think (as the prop rotates very freely) that the  extra added friction will not be too bad, as the stuffing box is packed with a good quality marine grease , and that I'm using hard nylon bushes at both ends of the prop shaft. I've ran the motor quite few times and checked the nylon bushes and there does not appear to be any excessive wear.
I'm hopping to trial her at the W/E and she how she performs on the Dam.

many thanks for your posts with regards to this build.
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HS93 (RIP)

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Re: Dumas Crist Craft Run About Speed boat
« Reply #59 on: October 05, 2011, 10:43:06 PM »

Just a quick hint on props and brushless start very small on props one run with to big a prop can burn a motor and controller out, for the first runs just do a few quick spins and bring it in and see how hot it is , they can get hot very quick, it is a pain but it saves a lot of money , that brass prop looks to have a lot of blade for such a high KV motor, go for a smaller two bladder you can get some cheap plastic ones that are good for testing till you find the right size.
Peter
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #60 on: October 05, 2011, 10:52:18 PM »

Hi Peter,

Thanks for your post, I'll try that,

Roy
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #61 on: October 07, 2011, 05:28:57 PM »




Hi, I'v changed the water jacket, as I has a slight leak on my home made silicon seal, !!! so I'm using the Ali one, !!! I've new seals to refit,

I've ran the boat for 3 mins , with no problems, and no over heat problems at all, !!! so ready for a trial at the Dam on Sat or Sun,
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #62 on: October 09, 2011, 06:34:34 PM »






WOW, !!!! Now thats f a s t !!!! renamed The Bullet, see the link below for a Youtube Video,

thanks for all the advice and interest  in this project


http://youtu.be/Vy6NQIeLe78

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MikeA

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Re: Dumas Crist Craft Run About Speed boat
« Reply #63 on: October 09, 2011, 07:58:30 PM »

looks good. need a longer vid of it at speed though pleasen :}
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sunworksco

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Re: Dumas Crist Craft Run About Speed boat
« Reply #64 on: October 09, 2011, 11:36:27 PM »

Do you think that a Novak 1600kv inrunner brushless would be fast enough in my Dumas ChrisCraft?
I have a couple on the shelf that I could use.
Kind regards,
Giovanni
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #65 on: October 10, 2011, 10:42:21 AM »

Hi Giovanni,

Hi,
re Novak 1600 I couldn't find any thing on the web, did a quick search, ? have you any data on this motor , size weight, windings, volts,, what amps will it pull, what battery are are you using,
what is your shaft size, what propeller are you going for ? what speed controller are you going to use ?

thanks from Roy  Scotland,

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sunworksco

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Re: Dumas Crist Craft Run About Speed boat
« Reply #66 on: October 13, 2011, 01:53:10 AM »

Thanks for your reply!
It is a #3618 with a Goat 3S Crawler ESC, 7.2v Hyperion li-poly and 1-1/2" x 2" prop.
http://www.teamnovak.com/products/brushless/ballistic_crawler/index.html
Kind regards,
Giovanni
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #67 on: October 15, 2011, 05:42:50 PM »

Hi, just fitted a new steel shaft and St/Steel coupling. bench tested 5 mins now works great, !!! just waiting for the weather to improve for second trial, in gthe mean time refit to dash board, adding lights and swith , and back lighting the speed dials, !!!!




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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #68 on: October 19, 2011, 04:51:50 PM »

Here's a Youtube link, with a new prop shaft and st/steel coupling, this is not a speed test, just a trial to check that evey thing is working OK,
http://youtu.be/FX9vOdKUczg

thanks for your interest
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sunworksco

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Re: Dumas Crist Craft Run About Speed boat
« Reply #69 on: October 19, 2011, 07:36:19 PM »

Where can I find Scale dash gauges for my Dumas Barelback?
Giovanni
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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #70 on: October 19, 2011, 08:27:50 PM »

Hi Giovanni,

The dials are from the std  decals (transfers ),  which are cut from the decal dash strip , holes drilled in dashboard, and the led's are fitted in the back pannel, then the dial decal which is cut down is cemented in the reverse of the dash, so that when the light they light up,
very easy to do:





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Meyer

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Re: Dumas Crist Craft Run About Speed boat
« Reply #71 on: October 19, 2011, 10:12:05 PM »

Hi Giovanni,

Just had a look at your Crawler motor, WOW,!!! Thats some engine, your Chris Craft, will fly, good luck with your build,
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sunworksco

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Re: Dumas Crist Craft Run About Speed boat
« Reply #72 on: October 20, 2011, 12:00:11 AM »

Thanks for your comment.
Can't wait to give them a go.
Regards,
Giovanni
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sunworksco

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sunworksco

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Re: Dumas Crist Craft Run About Speed boat
« Reply #74 on: October 20, 2011, 01:02:58 AM »

I have seen some builders using doll googly-eyes with the decal transferred to the reverse side and a chrome bezel surrounding them.
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