The first Hossack motorcycle Honda 500XL Built 1979. This same machine won the BEMSEE club canpionship in 1983 and the British Single Cylinder Championship in 1986-1987-1988.
I have been infatuated with this design since the early 80's. I am looking to make a replica frame for my Yamaha RD 350 engine. I need some tubing diameter and wall thickness guidance for the 4130 steel tubing frame. Ideas? references? Please post a reply.
Brilliant. Logical thinking put to practice, head angle and rake can be kept consistent, no decrease of wheel base during braking and much narrower suspension system which would be great for water cooled bikes, since the radiators receive more air that is less whirly.
Turbulent (whirly) airflow cools better than a smooth laminar flow. That's been tested and proved, so the usual placement of the Radiator behind the Forks is pretty efficient.
@@piearm1271 Sorry, no. Just recall an article many years ago, where someone relocated the Radiator to a supposedly better position, and found the cooling wasn't as effective. The basic idea is that turbulent airflow is slower, and impinges on surfaces more than a smooth fast flow, that doesn't have so much time in contact with the surfaces. Same theory was used on some Air-Cooled Engines, with various 'Wavy' or staggered Fin designs. Would be easy enough to test I feel.
John Warner there was a very good study carries by one of the Engineers working on a wankel for BSA/Norton who researched cooling, the empirical data showed most air cooled engines were undercooled and should run too hot, but as we know it’s not borne out in real world conditions, radiant heat, the release of heat assisted by vibration and slow speed air were all critical factors. Particularly the time it takes for thermal transfer to air, which is greatly assisted by partially turbulent air.
