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Author Topic: MH&B Topaz Build -  (Read 5146 times)

jpdenver

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Re: MH&B Topaz Build - alignment
« Reply #100 on: April 21, 2017, 04:24:01 AM »

Hello again,

If you are following this thread, you might have noticed that
I feel that talking about the mistakes I have made and how I corrected them is an important part of the build.

So - one of the things I noticed while trying to run-in the drive train is that it seemed to be lagging and struggling.

At first I thought that the driveshaft might have gotten bent or mis-aligned. However when the engine is removed
the shaft turns fairly easily.

So then I put the engine back in - this time WITHOUT the U-Joint. 

Well - shiver me timbers matey -
the shafts are not even pointing at each other.

In order for the U-Joint to work correctly the two shafts need to be pointed at each other. 
They do not have to be exactly straight in line, but the ends of the two shafts need
to be aligned in such a way that there is no strain put on each piece by the other.


So I added some shims under the back of the engine to bring the shaft up to meet the driveshaft.

Some pics:
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jpdenver

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Re: MH&B Topaz Build -
« Reply #101 on: April 21, 2017, 04:31:32 AM »

Time to start working on the Decks.

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steam up

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Re: MH&B Topaz Build -
« Reply #102 on: April 21, 2017, 09:15:09 AM »

I have always tried to ensure that the drive and prop shaft are dead in line before fitting a universal coupling, an alternative is to use a double coupling these always run very smooth.

steamboatmodel

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Re: MH&B Topaz Build -
« Reply #103 on: April 21, 2017, 06:32:24 PM »


I try to set shafts up with a solid coupling, then when things are inline switch to a flex coupling.
Regards,
Gerald.
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Jerry C

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Re: MH&B Topaz Build -
« Reply #104 on: April 22, 2017, 12:03:53 AM »

I found this arrangement has worked well for five years now with no sign of wear.  My steam plant however is removable in one go hence this design. I don't even bother to put the pegs through the holes in the yoke. Boat is looking really good.
Jerry.

oldiron

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Re: MH&B Topaz Build -
« Reply #105 on: April 22, 2017, 03:09:45 AM »

I have always tried to ensure that the drive and prop shaft are dead in line before fitting a universal coupling, an alternative is to use a double coupling these always run very smooth.

 Its smooth because a double Cardan joint is the way the job is supposed to be done. Just look at the driver shaft in your car.
Model boaters always insist on a single cardan joint. This isn't a proper universal set up. It can not possibly compensate for misalignment

John
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jpdenver

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Re: MH&B Topaz Build -
« Reply #106 on: April 22, 2017, 03:18:47 AM »

Gerald and Jerry,

I had gotten everything aligned in the beginning.  Then I decided to coat all the
wood in the bottom of the hull with a coat of clear fiberglass to act as a stabilizer and waterproof it.
This must have shifted things out of wack.

The kit comes with the U-Joint, and the tolerances are so close that I did not even have room for a
flywheel.  I'll come back to the engine again in a couple of days, but I wanted to get the deck done first.

As to the deck, I decided to attach the outside "side decks" first and then fill in the middle.  I am debating the
makeup of the middle planks.  and whether I will add come inlays. 

Tomorrow is our annual "Ice Breaker Regatta" with my club, The Colorado Crew, at our local city park.
So I did not get as much done today as I expected.

Thanks for reading,
Jim Pope
Denver, CO
USA

More Pics:
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Re: MH&B Topaz Build -
« Reply #107 on: April 22, 2017, 07:54:11 AM »

Looking good ,have you started on the cabin ?

jpdenver

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Re: MH&B Topaz Build -
« Reply #108 on: April 23, 2017, 03:22:45 AM »

No Cabin just yet.
I want to finish the decks first.

I decided to take a little departure and add an inlay strip
to the deck.  I used this in my other boats, it has become
a kind of trademark.

So far so good.

Thanks for reading,
Jim Pope
Denver, CO
USA




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jpdenver

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Re: MH&B Topaz Build -
« Reply #109 on: Yesterday at 08:09:53 PM »

Finished the aft deck planking.
a few more details and then the decks can start to get their
topcoats.

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Re: MH&B Topaz Build -
« Reply #110 on: Yesterday at 08:15:00 PM »

That looks great the checker board effect makes all the difference.
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