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Post by Achtung!! on Oct 26, 2007 7:59:41 GMT 1
CAnt see the third prop in the photos
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Post by rod on Oct 26, 2007 10:22:49 GMT 1
Warning Warning (robot from Lost in Space) I have managed to melt many (not all) of my plastic mounts I've ever foolishly put into an R/C boat. Main reason being is the motors get VERY VERY hot and I usually like to run the boat for a little while (think half an hour continuously) to get fun out of it. I have a supply of 7.2v batteries stacked up for a good run of fun so things sometimes smoke in the engine bay..
If I was doing this model, I would replace the plastic mount with some sort of wood or metal. Note sure if anyone else has had this experience but the old boaties I muck around with laughed at me the time I showed them my first R/C model with a plastic engine mount. Unfortunately it turned out they were justified in laughing when in the middle of the pond my shiny new flower class corvette made a strange noise and got very sluggish in the water. I brought it straight in and the motor had melted through the support it was in and was lying on the bottom of the hull so the shaft was flopping around all over the place still connected to the motor. It had also started to melt the hull - but thats a risk in any plastic boat - probably why the motor should be mounted off the floor of the boat. I replaced it with some aluminium strip that fitted just nicely and I've never worried about it since.
Funnily enough I tried using plastic a few times because I thought smaller motors may not have the problem, but even they caused problems so after trial and error I stay clear of plastic near motors.
Of course if you run the boat for 5 mins and let it cool - well don't worry about it. but who does that..??
Rod
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Post by russ on Oct 26, 2007 11:41:22 GMT 1
lookming at those instructions it looks a very very dismal thing, i dont like to modfy things but i think i might have to get a better idea on that middle prop so that if it wants it can turn in the water there for creating less drag
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Post by Guest on Oct 26, 2007 12:05:26 GMT 1
Chill
Look at step photo 26, this is now your third prop fixing hence only two prop shats suplied, supose it wont lok as ugly as a thrid prop shaft into the hull that goes to nothing but the plastic screw shown is still an awful method of installation.
I completely agree about plastic mptor mounts & gearboxes, in a confined space they tend to get very warm from the heat from the motor and running of the gearbox which can lead for them to melt
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Post by Achtung!! on Oct 26, 2007 12:41:46 GMT 1
Ah right thankyou.
Surely it wont be too much effort to machine a part out of wood/metal instead of a platic which melts.
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Post by Guest on Oct 26, 2007 13:10:57 GMT 1
No fear of it melting Chill
It seems they expect people to drill the end of the stern resin part to insert this plastic screw to which the third (centre) prop will hang ;D ;D
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Post by Achtung!! on Oct 26, 2007 13:53:59 GMT 1
Sorry I was referring to the actual mounts as per Rod's post.
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Post by bob on Oct 26, 2007 14:28:34 GMT 1
Another reason not to fit gearboxes and use a direct drive it seems.
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Post by markus on Oct 26, 2007 19:37:30 GMT 1
Another reason not to fit gearboxes and use a direct drive it seems. exactly what i thought while reading the above posts markus
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andre
New recruit
Posts: 2
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Post by andre on Oct 31, 2007 19:59:42 GMT 1
Now I am confused. All the photos that I have seen are for 3 motors and not 2. I am just starting on this project and do not want to make a hash of it. Andre
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Post by markus on Oct 31, 2007 20:29:31 GMT 1
Now I am confused. All the photos that I have seen are for 3 motors and not 2. I am just starting on this project and do not want to make a hash of it. Andre the 3-motor-version is a modification for those who want a scale drive... cheers markus
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Post by eric on Oct 31, 2007 21:16:55 GMT 1
Andre, I am doing the two motor version, but with Markus' rig, NOT Hachette.
I am content that two motors will work perfectly for me, being easier to install and should mean that the batteries last a bit longer with 1/3rd less drain on them!
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Post by BF on Jan 10, 2008 20:08:33 GMT 1
Is this link still working?
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Post by Mark on Jan 11, 2008 4:48:12 GMT 1
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Post by nm on Mar 26, 2008 0:34:35 GMT 1
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