Hill gradients!!!!! Again :)

[funkylyn]

So I will never make it to Hobart unless of course I start an appeal on this forum for funds to send me and my bike to Hobart to tackle the hill. The fund would have to be great enough to enable me to upgrade my 3 speed Agattu to one of the 2012 Impluse model 8 or 11 speed versions. I would not want to go all that way and risk ignominious failure to surmount the hill.
[/LIST]

Haha....tell you what.....lets get this appeal started, but for me not you , but instead of paying for the flights I need the 30day by ship option as I dont fly........BUT, at least theres no need to buy me a new bike I am confident I will sail up it on my TONARO.....

Lynda

 

[flecc]

Geebee: I still dont agree. In the original picture the house "horizontals" are still not parallel, e.g. in your latest picture it is obvious that the window frame is not rectangular. Using this un-rotated picture I still get around 20% gradient.

I think part of the answer is that the photo was not taken across the road at 90 degrees to the road, as clearly shown by the diminishing height of the handrail posts to the left of the photo. With the camera pointing somewhat uphill the visual impression and physical relationships are distorted.

 

[Blew it]

Mellifont Street, West Hobart

You can see the house in Wiki, just by the conifer.



File:Mellifont Street West Hobart.jpg - Wikipedia, the free encyclopedia

 

[flecc]

You can see the house in Wiki, just by the conifer.



File:Mellifont Street West Hobart.jpg - Wikipedia, the free encyclopedia

And that does indeed make it look much more like a 20% hill or perhaps 25%, gradients I'm used to in my area.
.

 

[10mph]

You can see the house in Wiki, just by the conifer.



File:Mellifont Street West Hobart.jpg - Wikipedia, the free encyclopedia

Many thanks Blew it. That will save me a trip, for I have just found an online topographic map at LISTmap Unsupported Browser
I am just going out now, but will look at it on my return unless someone else has deduced a hill profile in the meantime.

 

[Blew it]

Adjacent to the white house shown in the photos, the slope is 25%.
The steepest part, 29.6%, is 17 feet further down the hill

 

[Geebee]

Thanks for all the info on the hill, the original photo was taken out the window of the car whilst moving as stopping is not encouraged.
If it is only that steep I may have to have a go at ridding up it then.

 

[jazper53]

Good luck with that

 

[flecc]

If it is only that steep I may have to have a go at ridding up it then.

Ok for a crank drive bike, but it will be very tough for a legal hub motor one. I did just manage a 30% with a brief 33% section on my hub motor Q-bike at 71 years old, but it nearly killed me and I wouldn't try it again!

 

[10mph]

Adjacent to the white house shown in the photos, the slope is 25%.
The steepest part, 29.6%, is 17 feet further down the hill

I agree that it is more like 25% than the 20% which I estimated.

This link, Mellifont Street Climb, from some cyclists shows a google measured slope of about 25% for 100m, with a less steep run in at the bottom of the hill.

The topographic map which I linked earlier shows 30 m of contour intervals over a horizontal distance of 130m which gives an average gradient of 23%.

So Mellifont Street, Hobart is roughly twice as steep as my local steep hill which is 13% for 100m. I can now appreciate Geebee why you find it fearsome. I rather think I would need to upgrade my 3 gear crank drive Agattu to the 11 gear model to have any hope of climbing it very slowly.

 

[Blew it]

Ah! now that's interesting.

The 'Mellifont Street Climb' to which you linked, is exactly the distance I measured using the 'Path' facility in Google Earth. I then 'saved' the path. Place the cursor on the path created up the hill and right-click. Select 'Show elevation profile'. This is then displayed along the bottom of the screen and shows the % slope at any point on the 'path'.

Obviously, I'm not too good at math, so this facility in Google Earth is useful to me, even though it may not display gradients to micrometer accuracy.

Thanks for the update.
Regards
Bob