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| Most recent posts shown first (Show Oldest First) | (Print Booklet) |
📝 Norman McLeod Rogers
17 days ago by Seaspray (
Warrant Officer)
Warrant Officer)
Had a choice of chain drive, 1to 1 gearbox drive, cog drive. and belt drive. Opted for belt drive ( not the teeth drive) Made a pair of engine mounts out of scrap ply. Mounted them on 12 mm ply to get the right tightness between the two pulleys. Using a 20mm diameter x 2.5 thick set of belts belts from Thernobotsonline.com Got the pulleys from Mobile Marine but their belts were too thick and long. Used their pulleys. Pic 2 is where I'll put holes in for motor to take air in. Pic 4 the three screws is to be able to remove motor/ mount quickly.
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💬 Re: Norman McLeod Rogers
16 days ago by Seaspray (
Warrant Officer)
HI John I'll have a go at that thanks
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💬 Re: Norman McLeod Rogers
17 days ago by JOHN (
Warrant Officer)
hi Martin, if you removed those thick lumps of plywood from underneath the motor mounts - shaved a bit off the bottom of the motor mounts - so they fit snuggly into the bottom of the hull - using this method would this not allow you to fit the motors directly in line with the shafts and dispensing with the belt drive.
John 👍 Like
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📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Well I sussed it out, the motor were screaming because they were lashed down too tight to the wood. Must have taken more that usual power from the Mtroniks esc to have the motors run. Also the platform they were strapped to enhanced the scream. Both on the bench working now Also while passing the time I strengthen the below motor area and 2 section aft with fibreglass tissue. Looking into the possibility of changing the drive system to pulleys and rubber band system. Working out the belt diameter, done this with the Meteor and it worked. Many thanks to members for their help and assistance.
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💬 Re: Norman McLeod Rogers
28 days ago by Seaspray (
Warrant Officer)
Hi John I'll switch to MFA Low drain 550s. See you have supports running parallel to support the mounts. Will copy that idea looks sound. Something in the back of my mind said to resin / fibreglass the inside of the hull. It may need it in future Will make them out of ply as it will make a strong mountings. Many thanks again 👍
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💬 Re: Norman McLeod Rogers
30 days ago by JOHN (
Warrant Officer)
Couple of pics of home made motor mounts that would be suitable for your model. Also, your motors may be a little too large for that model. I myself would go for MFA Low Drain 550s.
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💬 Re: Norman McLeod Rogers
30 days ago by Seaspray (
Warrant Officer)
Rowen So am I and finding the problem it may help others Alignment, it was near enough spot on. When the Mtroniks and motors were set up on the work desk. There was no screaming, till I pressed down on the running motor. what a relieve I won't have to spent any more money well, for a wee while. Looking at two methods. Rubber belt drive and have ordered 3 sets different sizes, as suck it and see job. The brass coloured pulleys were bought from MFA. Other mount is on a rack of pieces of wood for a mount and the motor secured by elastic bands. This'll mean the motors will be in a upside down situation. Mean while doing some investigation on dumpy mounts to get an idea of things.
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💬 Re: Norman McLeod Rogers
1 month ago by Rowen (
 Commander)
Glad resolved.
Rather suspect vertical misalignment might have become a factor. Be better off with a belt drive anyway, overcomes a multitude of issues. Always great to get to the root cause of an issue, then we all learn. 👍 Like
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📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Have since discovered Electronize are closed for business totally.
Pic 1 my two Mtroniks Viper esc they squeal / singed when operated. So its a bin job.
Pic 2 As the motors were a wee bit loud and the vibration from them echoed thru 6mm wooden platform. The hole lot was removed carefully and no damage to the hull.
Rework I like it .
Pic 1 my two Mtroniks Viper esc they squeal / singed when operated. So its a bin job.
Pic 2 As the motors were a wee bit loud and the vibration from them echoed thru 6mm wooden platform. The hole lot was removed carefully and no damage to the hull.
Rework I like it .
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💬 Re: Norman McLeod Rogers
1 month ago by Seaspray (
Warrant Officer)
Hi ToraDog Went on to the site you gave a link to and signed up. I'll look thru and see what is what. It'll depend on what motors I get and will put the Graupner motors to the back of the cupboard. Thanks again
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💬 Re: Norman McLeod Rogers
1 month ago by Seaspray (
Warrant Officer)
Thanks John I am open to the upside down motor idea. Meanwhile looking at alternative motors and size. Also I applied fibreglass to the hull around the prop ends and the further two compartment aft. Scrapping the belt system will try and have a direct coupling setup if possible. Took ages to line up the belts.
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💬 Re: Norman McLeod Rogers
1 month ago by JOHN (
Warrant Officer)
Hi,
Hows about mounting the motors upside down? That should give you ample clearance between your hull and the motors - and - you will be able to mount them closer to your prop-shafts. I have done this myself on the Seaforth Clansman and it works just as good as normal mounted motors . But as they say one has to suit oneself :-) John🤓 👍 Like
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💬 Re: Norman McLeod Rogers
1 month ago by ToraDog (
 Lieutenant)
As previously stated, the ESC's cause the sceaming noise due to their frequency response. There is nothing wrong wit them, so don't toss them away. There are other manufacturers that make ESC's with very high frequency responses that are completely silent. I will include a link to the company I have been using, but there are others.
Save your Vipers for another use, like regulating a smoker. https://www.modellbau-regler.de/shop/index.php?language=en&M... Iuse a range of these ESC's and they have all performed admirably. The Easy set-up version works very well for most applications. 👍 Like
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💬 Re: Norman McLeod Rogers
1 month ago by dave976 (
Lieutenant)
It's the motors that are causing the noise. The Esc uses a high frequency to switch the current to control the motor and it is this frequency you are hearing through the motor windings. It was quite a common problem in the 90's and some escs allowed selection of different control frequencies to alleviate the problem. Mounting the motors to a wooden block on a wooden hull may also be amplifying the noise. Perhaps using some rubber or silicon as a mount would help. I can't see any suppression capacitors on your motors and they may also help with the noise issue.
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📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Any member know if Dave at Electronize is still available on the phone.
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👀 71 Views
📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Firstly removed the red wire on the esc wiring which makes it become the slave. Got all the running gear installed and the throttle stick travel set on the Tx/ Mtronices Viper 15 . Just these speed controllers are making a screaming noise when operating. any ideas what the problem could be ? Everything else is is running fine.
here is a link i was looking at https://www.modelboatmayhem.co.uk/forum/index.php?topic=3617...
here is a link i was looking at https://www.modelboatmayhem.co.uk/forum/index.php?topic=3617...
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📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Sawed the top of the frame to allow better access to the batteries. Decided to removed the end of the battery box and put a stop glued to the frame with an added support bock with some foam as a buffer. Did insert the foam and glue it to the wooden base. After some thought of the batteries getting hot they might melt some foam. So it was all removed and cleaned with a chisel. With the buffer at the bottom and some foam packed at the top of the battery It does allow removal / inserting of the batteries
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📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Built a battery box for the 2 power packs. I did think it would be tight getting them in and out of the model. Looking at cutting the (call it the work deck) around where the pencil line is. Tom made the hatches bigger, on his mode and that worked for him. Another thing I don't like cutting the top of the frames to gain easy access to the hull.
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📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Finally the motors in position and secured. Bored 2 holes each side / rear of the motors. Before this I got the motors to the right height. ( see the thin ply below the mounts ) screwed motors down tight added a premeasured piece of scrap below rear of each motor to get the right angle in line with the propshafts. Threaded the plastic tie thru the hole and s a piece of thin wire thru the opposite hole. Bored a little hole in the tye threaded the wire thru it. This helped get the tie thru the hole from the bottom. Secured motor but haven't cut off the extra on the tye just in case need reworked.
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💬 Re: Norman McLeod Rogers
1 month ago by Seaspray (
Warrant Officer)
Colin Just to make sure the motors are spot on with the propshafts as the mounting bracket are not the best as they won't keep the belts tight by them self. Belt and braces
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💬 Re: Norman McLeod Rogers
1 month ago by Colin H (
 Admiral)
Just curious, if the motors are screwed down, then why do you need to add tie wraps.
I have never had a motor mount come loose in 50+ years. Cheers Colin. 👍 Like
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📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Had a relook and altered the motors mounting to cut down some weight and have the ESC moved out of the hot air from the motor fans. Not too happy with the layout of the wire on the ESA. Have to be careful not to touch the +ve or -ve wire on the battery connectors and motors to the Rx and on/off switch. I am I being a wee bit cautious.
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📝 Norman McLeod Rogers
1 month ago by Seaspray ( Warrant Officer)
Warrant Officer)
Here is a " See how it goes". Roughly laid out and haven't done the motor mounts. Cut a big area out of the rudder frame as I was havening trouble lining up the allen key that tightens the tiller arm. Thought I'd knocked a hole in the planking but it was a piece of stray harddrive I broke up yesterday and it flew into a hundred pieces.
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