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1
Your Own Design / Re: Mercedes-Benz W165 Grand Prix engine in 1:3 scale
« Last post by Vixen on Today at 01:28:00 PM »
I agree with Jason about the comparison to the original (that admittedly has a lot of years of wear, tear and corrosion).

Per

Yes Per, that engine was built 83 years ago and has seen a bit of life.

I have found out a bit more about thier history, which may be of interest to some of out members.

Some more history of the W165 1.5 litre Grand Prix cars

Grand prix motor during the 1930’s was driven by intense nationalistic fervor. The might of the “Silver Arrows” was the result of a virtually limitless budget, illustrated by the fact that for the 1938 season no fewer than 14 cars and 19 of the 3 litre supercharged GP engines were built by Mercedes-Benz for the nine races they competed in that year. It was also owing to this vast budget that Mercedes-Benz could even consider designing and building a brand new 1.5 litre car just for the 1939 Tripoli Grand Prix and to do it in less than eight months. It is believed that the Mercedes-Benz factory may have built four cars, but only two were completed in time for the Triploi race.

History shows the two W165 cars dominated the Tripoli race with Hans Herman taking first place and Rudi Caracciola following closely behind. This was to be the only race the W165 cars competed in. The clouds of war brought motor racing to a stop in Europe for many years.

Mercedes-Benz continued to develop their racing cars during 1939 and into 1940 despite world events. The W165 was modified to use a more powerful two-stage supercharger to replace the single stage unit used for the Tripoli race. I have copies of some blueprints, which were signed off for production, dated July 1940. I based my 1/3 scale model of the engine on these blueprints.

By 1941 events were taking their toll on the Mercedes race organisation, the engineering staff were being re-assigned to essential war production work or were being drafted into uniform. The decision was made to disperse the cars to safe locations to the East. Cars and equipment were to be stored in secure locations, which include abandoned mine shafts, as far away as Czechoslovakia and Romania. The two 1.5 litre W165 cars were walled up in a cellar in a secret location near Dresden. One car was in almost  complete , the other was partially disassembled.

Towards the end of 1944, Germany was being pressed from both directions, US/UK forces from the west and the Russian steam roller from the East. Mercedes-Benz decided to relocate what they could into safer locations. The two W165 cars at Dresden were disinterred and transported by road to the border with Neutral Switzerland. At the border, the cars were impounded by the Swiss authorities and later released to the care of the Mercedes Swiss distributor in Zurich,  on payment of all the import duties and taxes.

When peace returned to the world, Caracciola, now a Swiss resident, was invited to race a W165 in the 1946 Indy 500. Apparently one of the W165 cars was resurrected and prepared for this race. despite problems in finding spare parts of any description. Particularly replacement, aircraft grade, fuel piping for the corrosive fuel. Unfortunately, the Allied Authorities refused to release the car for temporary export. Caracciola, still went to Indianapolis, now to drive an American car. Unfortunately he was badly injured in a high speed crash during qualifying.

The two surviving W65 cars were eventually returned to Mercedes-Benz in Stuttgart where they lingered in the museum collection for nearly 50 years. It was an invitation from the Duke of Richmond to demonstrate the Tripoli Grand Prix winner at the 1995 Goodwood Festival of Speed that prompted the two cars to be restored, including new body shells. Lang’s winning car has since been shown and run at several Goodwood  events, while the ex-Caracciola machine was placed on permanent display in the Mercedes-Benz Museum in Stuttgart



During my researches, I found a copy of this print. It shows Lang and Caracciola leading away from the perusing pack of red Italian cars at the start of the 1939 Tripoli GP race.



Hope you find this little bit of history interesting

Mike
2
Your Own Design / Re: Ringbom 1: Tim's Ringbom Stirling Engine Build
« Last post by tvoght on Today at 12:45:25 PM »
The frame is a pretty simple affair. There is a drawing attached.

The material is hot-rolled steel angle 3/16 inch thick with 2.5" legs.

Set up in the Bridgeport vise backed from below with a 1-2-3 block, a first
leg was cleaned up with a facemill. Then in a similar setup with that face against the fixed jaw, the other leg was cleaned up.



While still at the Bridgeport, all important holes were drilled, including the
large hole which will hold the bearing block. That hole was bored to size.
What is meant by important holes? All the holes which must have a precise locations.

Then to the CNC mill, where the part was clamped in the vise in a similar way.
The spindle was zeroed at the center of the bearing block hole for reference in the CNC program to be run. The program cut a profile in a series of progressively deeper cuts.



A separate program was used to cut some decorative slots.

3
Vehicles & Models / Re: Sweet Pea build
« Last post by Barneydog on Today at 11:26:54 AM »
Hi Guys,

Thanks for all your well wishes and comments.

I have now started to do some bits on the running gear built so far. Everything has been stripped off and will be refitted with a bit of fettling and adjustment. There are a couple of issues to be sorted before going further. The piston rings are an issue I will discuss with you later. My first problem that everything was getting tighter and tighter as more parts were added. While it is this tight there is no point in going further until the problem or problems are found and rectified.
Firstly the axles in the axle boxes were a little tight and needed easing. I also had very little clearance for sideways movement of the axles. They were pressing against the outer faces of the boxes. After investigation there was no option except to press the wheels off and reset them. I made two new axles a couple of millimetres longer. The shoulder the wheels sit against was exactly to the plans but made it tight so a millimetre each side allows the axle to float slightly. The axle boxes went in the four-jaw on the lathe for checking and facing squarely. Turns out they were not far out. I quartered the wheels again and fitted them back into the boxes and into the horns. They turned very easily but the axle boxes did not slide well in the horns. All four were attacked with a file to make them slide a nd twist better. This will allow for the axles to tilt slightly on uneven track. The springs were changed for some lighter ones as the ones I have that are meant for Sweet Pea are very strong and seem too inflexible. These will do for now and will be assessed when the loco is fully up to weight.
I had originally followed a plan to alter the mounting of the weighshaft to keep the valve timing more accurate. Refitting my bracket to the rear boxes the back wheels tightened up. I think the brackets put a slight twist on the boxes so no good. My other plan if this mod failed was to convert to walchaerts which is the path I am now taking. I will detail the parts another time when they are made.

Cheers

Julian.
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Your Own Design / Re: A Simple Uniflow Engine
« Last post by gary.a.ayres on Today at 10:15:19 AM »
Many thanks, guys.
 :ThumbsUp: :ThumbsUp:
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From Kits/Castings / Re: Coles C-611
« Last post by gunna on Today at 09:41:42 AM »
Thank you Jo for the great explanations and reasons of/for what you are doing. Love it!
Ian.
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From Plans / Re: Another Hodgson Radial 9
« Last post by Camm-1 on Today at 08:37:36 AM »
Took I wile to adjust the pipes to fit whithout to much binding.
Today I whant to do the sparkwires but dont have some good to put in the plug end.

Skickat från min SM-G960F via Tapatalk

7
Introduce Yourself / Re: New member from Lancashire
« Last post by Roger B on Today at 06:41:22 AM »
Welcome to the Forum  :ThumbsUp:  :ThumbsUp:
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Introduce Yourself / Re: New member from Lancashire
« Last post by Kim on Today at 05:35:40 AM »
Hi Stuart,
Welcome to MEM!
Kim
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From Kits/Castings / Re: Coles C-611
« Last post by propforward on Today at 03:59:45 AM »
Some good set up tips here that I am looking forward to trying.
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From Plans / Re: Elmer's Oscillating Cylinder Engine #42
« Last post by EricB on Today at 03:28:41 AM »
Thanks for the comments. I have a lot of time and emotion tied up in this frame.

Today I drilled and tapped the final six holes in it. If I never tap another piece of aluminum it will be too soon, but I still have another aluminum part to make with four more tapped holes. I practiced on a scrap piece and still had trouble with the last hole. I also broke my fancy ratchet tap handle on the four bottom holes.

Eric
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