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Search: Posts Made By: Machin
Showing results 1 to 15 of 15
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Forum: Road Cycling
01-09-14, 04:14 PM
Replies: 187
Views: 32,447
Posted By Machin

Just taking rider/bike weight into account to...

Just taking rider/bike weight into account to start, that is going to save you about 4 seconds on the course...

5% decrease in total (bike + rider) aero drag would save you a further 1.5...
Forum: Road Cycling
01-09-14, 03:01 PM
Replies: 187
Views: 32,447
Posted By Machin

The "Riding with two full bottles" scenario on my...

The "Riding with two full bottles" scenario on my program simply adds 1.5kg to the bike/rider weight (i.e. it assumes you were riding with empty drinks bottles previously so no aero difference is...
Forum: Road Cycling
01-09-14, 02:43 PM
Replies: 187
Views: 32,447
Posted By Machin

If we assume that guy's position on each bike is...

If we assume that guy's position on each bike is roughly similar (he says there are more spacers under the stem of the old bike, but that means nothing without knowing the frame dimensions) the main...
Forum: Road Cycling
01-09-14, 02:02 PM
Replies: 187
Views: 32,447
Posted By Machin

Good question... In the UK we generally use...

Good question... In the UK we generally use imperial units when talking about transport related issues (all road signs are in miles).... whereas there is less of a "common standard" in use for...
Forum: Road Cycling
01-06-14, 06:08 PM
Replies: 187
Views: 32,447
Posted By Machin

And my experience is also only based on testing a...

And my experience is also only based on testing a handful of friends so might not be applicable to 100% of the population.

I think a more valid point to raise is that whilst the program says that...
Forum: Road Cycling
01-06-14, 05:22 PM
Replies: 187
Views: 32,447
Posted By Machin

Again, you raise some interesting points and I...

Again, you raise some interesting points and I would add as follows:-



Whilst I totally agree that the critical power of an amateur will be lower than a more experienced rider, in my experience...
Forum: Road Cycling
01-05-14, 01:57 PM
Replies: 187
Views: 32,447
Posted By Machin

Thanks! And thanks for the feedback; I could...

Thanks!

And thanks for the feedback; I could definitely look at adding in an option to input power rather than time; I've shied away from it at present because I thought that not that many people...
Forum: Road Cycling
01-05-14, 01:39 PM
Replies: 187
Views: 32,447
Posted By Machin

I've been meaning to add the effect of tyre width...

I've been meaning to add the effect of tyre width to my program, and your question was just the kick I needed to get it done!

It's another counter-intuitive one: three tyres were tested by Jan...
Forum: Road Cycling
01-05-14, 03:16 AM
Replies: 187
Views: 32,447
Posted By Machin

The reason for creating my program was to allow...

The reason for creating my program was to allow you to quantitatively asses the benefits of X versus Y... which might be training vs. a new bike; both are covered on the program.

Interestingly...
Forum: Road Cycling
01-05-14, 02:44 AM
Replies: 187
Views: 32,447
Posted By Machin

Hi, thanks! I'm 76kg and 6 foot 2 inches......

Hi, thanks!

I'm 76kg and 6 foot 2 inches... not ideal for a racer, and I hardly ever ride "on the drops".
Forum: Road Cycling
01-04-14, 03:58 AM
Replies: 187
Views: 32,447
Posted By Machin

Thanks! It does seem counter intuitive...

Thanks!

It does seem counter intuitive doesn't it?! But it is a totally real effect.... it essentially boils down to the fact that a 5% improvement on 60 minutes (3 minutes faster) is higher than...
Forum: Road Cycling
01-04-14, 03:49 AM
Replies: 187
Views: 32,447
Posted By Machin

You have raised an interesting point... lets put...

You have raised an interesting point... lets put some numbers to it and investigate the effect: below is a graph showing my personal "mean maximum power output" for times from 1 minute to 60...
Forum: Road Cycling
01-03-14, 04:49 PM
Replies: 187
Views: 32,447
Posted By Machin

The interesting thing is that whilst the above is...

The interesting thing is that whilst the above is true, because the slower ride spends more time on the course he/she will save more absolute (as opposed to relative) time from the aerodynamics than...
Forum: Road Cycling
01-03-14, 04:34 PM
Replies: 187
Views: 32,447
Posted By Machin

I agree! Seems mad right?! But a study by...

I agree! Seems mad right?! But a study by C.R.Kyle entitled "Athletic Clothing" for "Scientific American" found that it reduced drag by 200g at 30mph... I convert this to a Cd.A figure and the...
Forum: Road Cycling
01-03-14, 03:36 PM
Replies: 187
Views: 32,447
Posted By Machin

I know this is an old thread, but I thought the...

I know this is an old thread, but I thought the topic seemed appropriate...

I'm a mechanical engineer by trade and "a bit" geeky. Like a lot of other people I wanted to know how much faster "x"...
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