My life with Python trikes Mk1 , Mk1.5 , Mk2 ?

Joined
Feb 7, 2008
Messages
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Nottinghamshire England
Ok out with the power tools [ sod it being Sunday ! ] bit of cutting and welding later :-



We have a brace/gusset it is not welded on all sides as I could not be ar**d to remove the wheel or the upper bolt however the 4 longest sides are welded , that should hold it [ I'm no Chris Hoy ! ]



The problems I am having designing a new front end stem from the seat height/BB relationship , I have now reached [ well exceeded ] the height you can get from a 20" wheel mounted in a 20" MTB suspension rear end.

As you raise the BB it starts to move towards the seat , now this is fine for the pixie on here with his ankles connected directly to his knees [ you know who you are ] however if you have a normal inside leg measurement you cannot keep moving the seat back to get the leg length right.

So the answer seems to be to use a bigger wheeled rear end although it could probably still have a 20" wheel in if needed , or we could go to 24" ?

Now this is a 24" rear end , although it has a odd shape and so is as long rear axle to BB as a 26" rear frame.



So with no jiggery pokery we can achieve the same height as in the botched front end and still have the axle in the same place ?



These are not quite in line the new one wants to be to the left about 2" then with a little bit of creative design I should be able to shave an 1" off the pivot design and it could fit in the same space ?

more musing needed Paul

ps Tilt#4 needs 4 x M12 locknuts on the pivot - 2 x M8 locknuts on the BB extension - move over the pannier rack and flag/reflector holder from Tilt#3 and hopefully it will be ridable Wednesday all being well.
 
Joined
May 31, 2013
Messages
3,178
Location
South Benfleet, Essex, England, UK
You may find that your ready-made triangle is indeed your best bet. It is guaranteed to have no chain-line issues for a start. (y)
While the pivot side of it might (to some eyes) look a bit kludgy ;)
If it gets you where you want to be, why the heck not?
At least you are getting significant miles in and gaining a good feel for the "Pilot-tilt-Perfect-Python-paradigm" (try saying it 6 times) ;)
 
Joined
Feb 7, 2008
Messages
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Location
Nottinghamshire England
Tilter #3 = 182 miles

Engine seemed happier today although gearing down a little for some of the hills , getting hot !

trike did as advertised on the tin ?

Did some Pythoning
................Tilting
................Got me there
................Got me back

Paul

ps might be a shame not to do 200 miles on it ? Wednesday and Friday of this week should do it ?
 
Joined
Feb 7, 2008
Messages
3,245
Location
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Tilt#3 = 194 miles

Engine seemed happier today although gearing down a little for some of the hills , getting hot !

trike did as advertised on the tin ?

Did some Pythoning
................Tilting
................Got me there
................Got me back

Paul

ps might be a shame not to do 200 miles on it ? Wednesday down and Friday to go , should do it ?
 
Joined
Feb 7, 2008
Messages
3,245
Location
Nottinghamshire England
Tilt#3 = 204 miles

Engine seemed happier today although gearing down a little for some of the hills , getting hot hill climbing !

trike did as advertised on the tin ?

Did some Pythoning
................Tilting
................Got me there
................Got me back

Announcing a very small very last minute Zombie meeting , possibly only 2 ! however all are welcome.
St Ives , Cambridgeshire Tue , Wed & Thur yes we might get wet , yes it might be cold however memories are not made by sitting indoors wishing you could do something !

Paul
 
Joined
Feb 7, 2008
Messages
3,245
Location
Nottinghamshire England
Tilt#3 = 238 miles

So put about 34 miles on it @ St Ives with DannyC

Tilt#3 = 250 miles

Usual trip to Mothers nice to be out in the fresh air.

Despite the trikes usual reliability Dan missed a mild malfunction when on the way back from mothers a upper rod end bolt loosened slightly and caused the front end to swing vertically about 1" either side of vertical , quick spanner job and back on the road.

Paul
 
Joined
May 31, 2013
Messages
3,178
Location
South Benfleet, Essex, England, UK
Tilt#3 = 238 miles

So put about 34 miles on it @ St Ives with DannyC

Tilt#3 = 250 miles

Usual trip to Mothers nice to be out in the fresh air.

Despite the trikes usual reliability Dan missed a mild malfunction when on the way back from mothers a upper rod end bolt loosened slightly and caused the front end to swing vertically about 1" either side of vertical , quick spanner job and back on the road.

Paul
Drat I miss all the good exciting bits. :)
 
Joined
Feb 7, 2008
Messages
3,245
Location
Nottinghamshire England
Ok so today's job ?



Making Tilt#4 ridable by stripping the needed parts from Tilt#3 , the beauty of incremental changes and keeping as much as it as possible the same ;)

So transferred the seat lighting bar [ DannyC I found the constant squeak that plagued me for days ? M8 bolt loose in upper seat mount :mad: ]
transferred rear pannier rack and flag mount , later not need.
Move clipped pedals over.



Swapped twist grip for a bar end shifter to get the brake lever higher , the gears are low however in Tilt#2 guise I did 72 miles on it so it must be ok for around here.
Adjusted the brakes and gears and added mirrors etc
Done another 4 laps in local estate tweaking bars and controls mainly.

Unsure why however I feel apprehensive about Mondays ride despite doing about 2 miles on Tilt#4 today again with no surprises.



It maybe be this ? the turning circle is insane probably about 8 feet ! or even less !!
I need to find someway of measuring it , I can actually sit on it and tilt the front over nearly as far as this whilst stationary and it just sits there with me upright waiting to pedal off.

DannyC saw Tilt#3 behaving well , sadly has was about 5" to short in the leg department to ride it , and there was no way I could shorten it that much for him to try it.
I did ride it briefly no hands to show it's stability and later he followed it watching the underneath trike rising and falling with me staying upright , sadly no video.

Paul
 
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