Lotus 25 And Lotus 49
Posted Oct 06 2015 - 02:33 PM
Basically Wikapaedia says the 25 was a revolutionary design with the first fully stressed monocoque.Whereas the 49 was built around the Cosworth DFV and was the first to feature the engine as a stress member.
Please explain anybody.
Posted Oct 06 2015 - 03:36 PM
The Lotus 49 was different. It didn't have a rear part of the chassis. The motor was used in place of the rear part of the chassis. The motor bolted to the bulkhead, and through brackets the suspension bolted to the motor.
Posted Oct 06 2015 - 03:44 PM
Posted Oct 06 2015 - 04:04 PM
The Lotus 49 added extra stiffness to the monocoque chassis by using the engine block itself (the Cosworth DFV) to bolt on the suspention pickup points, rather than a tubular spaceframe 'cradle' in which the engine was mounted. The added stiffness aided handling, but as Tauranac proved again, wasn't essential for a light, good handling car if your spaceframe was well designed. The 1969 Brabham BT26a used a Cosworth DFV but in the spaceframe cradle originally intended for the Repco V8, and it handled better than Lotus' own 49b. So, in my opinion, using the engine as a stressed member wasn't such a gamechanger as everyone is now led to believe. Of course, it did make creating a competitive chassis easier, as a lot of the 1970's garagisti proved.
Edited by TvO, Oct 06 2015 - 04:05 PM.
Posted Oct 07 2015 - 03:41 AM
“They filled it with fuel, bolted the engine on at the back”
I think that if you were to write “They filled it with fuel, bolted the engine in at the back” it describes it rather better”, otherwise, fine .
Posted Oct 07 2015 - 05:55 AM
And according to Wikipedia:
"The 43 chassis was an excellent design let down by a poor powerplant, and design elements of it were used in the design of its 1967 successor, the far more successful Lotus 49, including the use of the engine as a stressed structural member which bore weight and to which the rear suspension was attached."
I'll dig out my camera and upload a couple of pics shortly... edit here we go:
Edited by Fat Rich, Oct 07 2015 - 06:54 AM.
Posted Oct 07 2015 - 08:14 AM
Posted Oct 07 2015 - 08:40 AM
Thanks FR for excellent photos!!
Posted Oct 09 2015 - 02:03 PM
Buy both the Tamiya Lotus 25/33 and Lotus 49 kits and assemble them.
Building very accurate kits such as these is the best education on how anything was designed and assembled.
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