CREW CHIEF AND TRIUMPH INFOR ROCKET STREAMLINER DESIGNER
Did you produce the power first?
We’ve run the tuned engines on a regular dyno with them housed in a regular Rocket, just like you would a conventional bike. Then again once on the chassis, with the two engines combined. We’ve run the Streamliner on a specialist car dyno, the long wheelbase wasn’t a problem so we know the power and torque of the engines combined. We looked at chassis simulation to limit weave and wobble. We worked with Dynomotion in Italy who work with many of the Motogp teams. We can try different simulations to get the balance right, wheelbase and head angle, that way we know we have something stable using algorithms before we go ahead for real.
Is it hard to balance?
Balancing the bike is relatively easy. We have 15lb of lead on the right side because the Rocket engines are slightly heavier on one side than the other. The static balance is rather easy to be honest. You want weight over the rear for traction, but you don’t want the front to be too light as you need weight over the front for stability. Then it’s the aerodynamics – which is the hard part.
So the faster you go the more stable it is?
If I remember right off the top of my head, the worst wobble comes in just over 100mph, then weave starts to creep in around 200mph or just before. Once you are above 200mph it’s actually more stable, according to the computer.
So the dangerous part is running at sub-200mph?
For stability you could say that, as once above 200mph you should have the stability but then once above 300mph approaching 400mph you are then pushing the mechanicals, tyres for example and the wind can become an issue – along with a thousand other things.
What is it like working with Guy?
At first we were a little concerned as originally the Streamliner was designed for a shorter rider and we were concerned he might not fit in, but he gets wedged in there. Guy is amazing to work with he has no fear, he just wants to go for it. If we say ‘let’s go flat-out’ there’s no doubt he will go for it. Guy is used to road racing, where you don’t have the best handling bike because of the conditions, jumps, bumps etc. Our bike isn’t the best handling, but Guy just jumps in and gets on with it. He is used to just going for it. For some riders it can take a week of practice to ride past the weave and wobble – it took Guy 15 minutes.