Author Topic: BN's - Mitcham Marine Spitfire  (Read 6261 times)

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Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #30 on: April 29, 2018, 10:48:16 AM »
Well it fits and lines up nicely with the top of the deck/bottom of window (not in picture). Sorry about the poor picture and fibreglass dust everywhere, raining like mad again as well. Not bolted in yet, just loose, but when screw heads are powder coated, they will all blend in and unit will fit tightly. I have saved at least 5" (128mm) by insetting the control box. Also, it is now easy to service and no holes drilled in the seat back.

Just have to shorten the lever and weld the top back on as it is far too long. Also the neutral button (round grey knob), can now be pressed in easier, plus I can make a lock to hold it in neutral for testing if needed.
« Last Edit: April 29, 2018, 10:51:04 AM by BN »
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #31 on: May 01, 2018, 02:06:08 PM »
I decided that the 'potholes' on our now dreadful roads was going to destroy my little Mitcham Boats, so I decided to add an axle. The idea is that with a longer wheel length, the boat might just have a easier ride. Some of the holes in this area require a ladder and safety harness to get out of, once in them  >:(

The axle, which is fully galvanised is easily removed, but has made manoeuvring easier. Normally twin axles are a pain. Total cost about 2 hours work, weld up the scraps around the place and galvanise  8), no physical cost.
« Last Edit: May 01, 2018, 02:09:28 PM by BN »
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #32 on: May 04, 2018, 12:06:57 PM »
The Control Box is in and I simply have to cut down the lever now as the marks show. I might leave it white, not sure yet?

This project has challenged my alloy and stainless welding skills that is for sure.
« Last Edit: May 04, 2018, 12:09:11 PM by BN »
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #33 on: June 05, 2018, 11:46:33 AM »
Progress, the gears are ready and the wheels work well. By adding the extra axle, the wheels cover road pot holes of about a foot across with little to no affect. As you know when towing, people simple give no room to manoeuvre sometimes and I feared that damage would be caused to the boat due to the horrendous pot holes, especially on the near side.

Even better, I don't need a jockey wheel as the unit is balanced well; and as the unit is very light, I can manoeuvre it into tight spaces, by using the axles.

Because Northamptonshire is a failed county council (fame at last  >:( ), our roads and other public facilities appear to be crumbling fast.
« Last Edit: June 05, 2018, 11:48:54 AM by BN »
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #34 on: June 14, 2018, 09:53:15 AM »
Just a picture of the 'rig' with the trailers new 4 wheels. It certainly helps over the pot holes for sure.
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #35 on: October 21, 2018, 10:58:56 AM »
An update on the twin axle modification. I have to admit, it was not a good idea because the ride was too harsh. Certainly missed the pot holes, but bounced, simply because I could no longer get 250kg axles. The minimum now is 350kg, far too harsh for such a small boat. So I am back to one axle. At least I tried the principle out  ::)
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #36 on: July 12, 2019, 01:30:50 PM »
Trying to get a cable for controls on a Mitcham Spitfire is a challenge to say the least, so here is the answer. Cable ends made by Cable-Tec in Sutton in Ashfield, Nottinghamshire. They even come with a thread in the large end as well as on the thin end, so all I have to do is set in a threaded tube to fit the cable I need. Call Cable Tec on 01623 440398 and mention 'Old Speed Boats' they are great.
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #37 on: July 18, 2019, 08:53:55 AM »
I needed a modified coupling for the Honda OB converter kit, but could only buy a kit at about £160, so had to resort to making one. With the good old Myford lathe and about 20 minutes work, I will have a new link which fits my spec. In fact the cruiser propshaft brass in line spline insert will make two at a cost of £3. My coupling is 200mm long with an unusual M4.5 thread.

I am making a bespoke lightweight throttle coupling for the Spitfire OB.
« Last Edit: July 18, 2019, 09:10:50 AM by BN »
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #38 on: July 31, 2019, 04:15:42 PM »
Have you ever had a problem with fitting the outboard well kit for steering the boat. It is not difficult until you try to fit the 'round ball' adjusting unit. The ball always appears to be tight, but in my case this time, the thread had been damaged in transit by Couriers.

I thought, no problems, lets get a die and run down the thread, but it was one I did not have. So I went to the local stockist and found the die was going to be £74, yes £74????

Desperate days, I needed one now, so I purchased a nut and cut a slot in one side. Clamped the nut in a pair of Mole Grips, put some cutting fluid on the thread and ran the nut up and down the thread. Took a bit of time, but for £0.50 it saved the day and saved £73.50  :D

« Last Edit: July 31, 2019, 04:17:49 PM by BN »
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #39 on: August 06, 2019, 08:33:29 AM »
I am converting the Honda OB from tiller to remotes, an interesting if not very fiddly job. Add to that the size of the little Mitcham OB Spitfire, it becomes a micro job. Now installing the control cables, not easy, but found there are standard cables and 'skinny' cables, but I never knew that.

The main problem are the bends and total lack of space. I have done the gas and gears, but the steering is looking like it has to go back to cable control. Anyone have any ideas for micro controls?
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #40 on: August 31, 2019, 08:13:15 AM »
Nearly all done now, just sorted out the OB connection, but have to make it now  :D
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #41 on: September 12, 2019, 12:32:19 PM »
A little more progress with the Honda OB steering. An off the self steering adaptor was going to be about £45, so needs must, make it.

I took a bit of 4mm sheet steel, not stainless because it fits onto the alloy OB body. Simple bit of angle grinder cutting and a bit of pressing to make the angle and 'bingo' done. About 20 minutes and £5 worth of metal and paint  ;D Not perfect, but a better one can be made through the winter  :D
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire's
« Reply #42 on: September 13, 2019, 02:22:06 PM »
Well, the Mitcham Marine Spitfire outboard version is finished  :D

Well not quite, have to wire up the safety cut out, clean the whole boats and make a centre for the steering wheel. As most of you know, I make my own with the date on them. There is a carpeted floor, but forgot to put that in for this picture.

I will try to get it out in the sun tomorrow and take some proper pictures, too many tools on the stern at the moment for that  ;D
« Last Edit: September 13, 2019, 02:25:01 PM by BN »
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline BN

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Re: BN's - Mitcham Marine Spitfire
« Reply #43 on: September 17, 2019, 04:01:29 PM »
The boat is finished, just have the steering wheel centre boss to make and fit. I will try some outside pictures on Thursday, when I can get it out of the garage and into the sun  :D
1953 Albatross
1958 Dowty Turbojet
1965 Mitcham Jetboat
1968 Mitcham OB

Offline enginuitytriumph

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Re: BN's - Mitcham Marine Spitfire
« Reply #44 on: September 18, 2019, 10:08:33 PM »
And of course on the water on Saturday !! ;D
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