Search results

I I think that we are in agreement that a helmet needs a compressible layer of material so that in the event of the head hitting something, the material will compress thus reducing the acceleration to which the brain is subjected. What we dont agree on is how much a polystyrene bike helmet...

Now I have to disagree with this. I fly aircraft for a living and one of the most important and frequent elements of my training is something called Crew Resource Management or CRM. It's basically a study of air crashes and how human frailties contribute to them happening. Accidents do not come...

Daz Marshall, I'm afraid that you have fallen victim to cycle helmet manufacturer's propagander. I don't know which type of cycle helmets you have owned or examined, but every single one that I have seen is manufactured from a dense type of polystyrene which possesses nothing like sufficient...

It is the foam layer to which I refer, not the polystyrene. The Polystyrene used in the manufacture of cycle helmets has very little compressibility and therefore offers little towards reducing g forces on impact.

I'm surprised that you are finding that the bike has very little power. This Panasonic unit uses the motor output shaft to measure speed and hence the motor cut off point. So in effect, it's how fast you turn the pedals, or pedal cadence, which determines the point at which the motor cuts, not...

All of the 26 volt motors and some, if not all (check) 36 volt from 2008 onwards will fit. They all use the same casing and bolt pattern. It makes sense for them to do this, because it means that the bike manufacturers don't have to re-tool each time a new motor is produced. I do believe that...

I was never enrolled into the Golden Shoe Club, but I do remember finding the certificate and application form in the shoebox. Thanks for the links, amazing to see Golden Shoe HQ. I would imagine the club is only a shadow of its former self with the decline of industry.

I've sent you a PM landyguy.

I have looked into retro-fitting a 36 volt system to my Pro Connect when the motor failed. 1/ The motor bolt pattern and the casing for the 26 and 36 volt system are both the same. The motor will fit, straight swap. 2/ The 36 volt motor has an external wheel speed sensor, it doesn't detect...

Totectors! I've not heard that brand mentioned for years. I remember queueing outside the Totector van as a 16 year old apprentice, waiting for my free shoes. The company changed supplier to Goliath a few years later. They were rubbish, unlike Totectors, the Goliath safety boot was no good at...

Children are often used by companies to blackmail parents into buying things that they don't need. Suggesting that you are a bad parent unless you buy XXX is a very powerful marketing and sales tool.

I have already stated that a cycling helmet will provide protection against superficial injuries to the scalp, and I think that we all agree on that. So yes, I am saying that they do provide some degree of protection. But, I don't believe that a cycle helmet will protect against heavy impacts...

Under the circumstance that you outline, a helmet would provide some protection to your scalp, but as far as protecting against a brain injury is concerned, you may not be any worse off without a helmet (see my explanation above for the reason why). Then there is the fact that the helmet only...

It still sounds very similar to my motor fault. If I removed the chain and then put pressure on the pedals, the motor would turn the chain drive sprocket. When I then put the chain back on and rode the bike, the motor would run but the power delivery was minimal. As you suggest, it's like the...

If the motor is turning the chain drive sprocket when you apply pressure to the pedals then as flecc suggests, it is very unlikely that you have a mechanical fault with your motor. It sounds very much like the fault which I experienced. This was the motor being stuck in a very low mode of power...

My motor did exactly the same when I applied pressure to the pedals, it turned but there was very little torque, hence very little power.

Pleased to hear that the battery is performing well. I'm staggered that you managed to import one for $200 including the battery and shipping. They wanted nearly $300 off me just to send the battery. The unit cost of $140 was on top of this making it too close to UK prices to bother with. A...

Let me put some numbers to this: a = ((v1*v1) - (v0*v0)) / 2d Say you are travelling at 20 MPH v0 = 9 m/s d = 2 mm of foam (say for a cycle helmet) a = 20250 or 2025G (most likely fatal even though the G force is for a very short duration) d = 50 mm of foam (motorcycle helmet) a = 810 or 81G...

I can point you in the direction of Newtonian Mechanics and the laws of physics: For example, a = ((v1*v1) - (v0*v0)) / 2d Where: a = acceleration (a high value of (a) on the brain is what does the damage) v1 = final velocity (ie 0 when the head has come to rest) V0 = initial velocity (ie...