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Old 16-05-2015, 08:54 PM   #1
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New toy

Have got this ring 21 have a lot of work to do and will post as the work goes
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Old 16-05-2015, 08:56 PM   #2
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More pics
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Old 18-05-2015, 11:29 AM   #3
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Country: The Netherlands
Boat make: RING 21C
Engines: Mercury 2.4carb 200 (Mazco RE4, Chopper 24, Tempest 24)
Cruising area: The Netherlands, Gardalake (IT)

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Looks like a 20?
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Old 16-08-2015, 06:55 PM   #4
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Up date
Am going to fit a5.7 v8 in boat have made transum right angle and have done weight test and now have a engine to fit
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Old 16-08-2015, 06:57 PM   #5
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Old 16-08-2015, 06:58 PM   #6
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Pics of boat
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Old 23-08-2015, 04:57 PM   #7
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Engine beds in and engine having fall rebuild
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Old 23-08-2015, 04:59 PM   #8
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Engine in bits
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Old 31-08-2015, 04:09 PM   #9
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Transom al grp up lots of filling and fairing to do
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Old 01-09-2015, 04:23 PM   #10
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Engine mounts

Quote:
Originally Posted by r1horn View Post
Engine beds in and engine having fall rebuild
I was just reading your build thread and looks very good especial the design of the transom.

I just finished converting a Cougar from outboard to inboard and was given a lot on help and advise on this forum.

I was looking at your engine mounts and just wanted to pass on some advise that I was given by the forum founder and may be worth you bearing in mind.

When a boat takes off and comes back down the force of the water stops the hull's downward motion very quickly, but the mass (or weight) of the engine still wants to travel in the same direction i.e. down and puts a massive load on the engine mounts.

I was told in racing this can be to to 50G's. I other words the mass or your engine up to 50 times its own weight. so if your engine is 300kg and you hit a wave hard enough and cause 50G's your engine will have a force of 15,000kg trying to make its way out of the bottom of your boat. I found this hard to believe but it is true and it is not unheard of rip the the side out of and engine block when racing.

So it is important to spread the loads caused by the mass of the engine throughout the full bottom area of the hull, using longitudinal and transverse frame structures. With the type of boat you have these would be tied into the transom and the floor.

One of the problems I had with this was that the frame on my boat are foam filled instead of wood, and although it still makes a rigid structure you cant just mount the engine directly onto it. So I had to make a further frame out of aluminum to spread the loads. However in your case as you are starting from scratch you could make a wooden longitudinal and transverse frame structure ans should be no need for a sub frame.

Its only my my opinion but if you make your engine mounts as you have after a couple of waves the engine may fall though the bottom of the boat.

Have attached some pictures showing the framework in my boat and the sub frame i made to make to distribute the load evenly through the foam cored structure.

Good luck with your project

David
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Old 03-09-2015, 10:55 PM   #11
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Thanks for your post looks like you have done a nice job on your boat,my engine beds are only mock up just to make shore they are in the right place
Once I have put engine back together I will mock fit to boat and see how much room I have then I will build a hole new mattrickes in boat
Will keep posting as I go .
Have just finish porting and polishing head and going of for gas flowing ,hoping to get over 300 bhp
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Old 05-09-2015, 01:55 AM   #12
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Hole cut out
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Old 10-09-2015, 05:24 PM   #13
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Engine mocked up in boat
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Old 11-09-2015, 08:23 PM   #14
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Engine beds all done
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Old 12-09-2015, 09:01 AM   #15
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Country: Holland
Boat name: witlof
Boat make: Ring 21C Mercruiser 4.3L
Cruising area: Holland + Lake Garda

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Have you measured the height/ x dimension of the drive? If I look to the picture the drive height will be far to low. I have also a Ring 21C in which I build in a V8. But the drive creates now a lot of drag.
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Old 14-09-2015, 12:34 AM   #16
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Engine coming together
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Old 19-09-2015, 06:02 PM   #17
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Engine done just got to do the wiring and run it up
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Old 22-09-2015, 09:00 PM   #18
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Engine in boat so I can work out exhaust
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Old 22-09-2015, 09:02 PM   #19
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Exhaust cut in
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Old 03-10-2015, 02:33 PM   #20
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Transum done
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