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Sirocco - Soft Sand Trike

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34 posts • Page 1 of 3 • 1, 2, 3

Sirocco - Soft Sand Trike

Postby mrfritz on Tue Feb 14, 2012 1:23 am

The last box of parts I was waiting on before starting the assembly of this build arrived today. Sirocco is a dry wind that blows across the sands of Africa. I was inspired by the trikes and beach bikes on this site to try to build a trike that can be used as a prime mover to get elderly and handicapped people across the loose sand barrier between the pavement or boardwalk and the surf packed sand.

Stopped in to start working on the build at Colin's. "Haulin Colin" makes a lot of custom trailers and cargo bikes. Frankly he has a lot nicer shop than I do and a lot of it came in handy tonight.

Put the frame in the stand and did a rough fit of the trike frame and rear wheel/tire.
Image

The rear tires are norco 21x12-8 slicks mounted on kite buggy wheels. We had to drill out the 15mm bearing adapters to fit the 5/8 axle and Colin will be fabricating a driving plate to weld on the axle flange tomorrow. They were pretty close to a perfect fit and are lightweight compared to some of the other options. The Wheeleez are probably lighter, but after calling them 4 times and not getting an answer I decided to go this route. The Norco's run at 4psi and this wheel configuration is very popular and sees a lot of abuse from the kite guys.

This is a little better picture showing how the wheel fits along with SA 5 sp transmission. The adapter is simply going to get welded to the driver and bolted to the wheel with one bolt for each of the 8 spokes.

Image

Once both rears were mounted we started working on the front. The headset wasn't quite right so we had to press out the tube and turn down the race support, one of the bearing shells cracked so we replaced it and that meant the dust seal need to be trimmed. The front rim is a "Large Marge" and laced with heavy duty spokes to s surley hub with an endemporph 3.7 on it. Initially it just cleared after the build it just touches. We'll dimple the chopper forks a hair. I was really able to save a lot of money by recycling abandoned snow bike parts I found on CL.

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At this point it seemed like it was time to see what happened when we put the roller on the ground. It was pretty obvious that the 30" forks were a bit too long so we adjusted them down a little to give it a flat rake with plenty of ground clearance.

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From there we trimmed up the fork tubes and dropped in the stem and mounted the handle bars all pretty uneventfully.

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This last picture shows how the trike kit fits on. It's pretty simple really.

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With that we called it a night. Colin is going to work on finishing up the rest of the human powered part of the driveline tomorrow. After work I'll stop by and we'll plan out the electric drive and rear carrier for the articulated trailer. I feel even more confident than when I started that this will have enough floatation to get across the sand and isn't going to be too heavy to pedal doing it.



I'm still at a loss related to seat and grips. I would like to put a suicide shifter on, but so far I have had no luck finding the SA 5 speed stick for it. BUT despite that, I should be able to ride it tomorrow and have it powered up not long after that.

FUN!
mrfritz
 
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Re: Sirocco - Soft Sand Trike

Postby Eibmoz28 on Tue Feb 14, 2012 3:30 am

That trike is so cool I look forward to seeing it completed.
Last edited by Eibmoz28 on Sun Mar 04, 2012 6:28 am, edited 1 time in total.
viewtopic.php?f=21&t=59630
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Re: Sirocco - Soft Sand Trike

Postby mrfritz on Tue Feb 14, 2012 8:16 am

Was thinking about the seat this morning and think I've narrowed it down to a few choices.

The ever popular and inexpensive Velo kit about $40..
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A stamped steel universal implement seat for about $25 that I could then paint, powdercoat or plate anyway I wanted.
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The Lehman's cast aluminum implement seat for $50 that I could paint, powdercoat or polish.
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A stool with a plastic implement seat that I could purchase online or from Target for $65 there are colors but I think white.
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I think for any of these I'm going to mount them on a suspension seat post. The Lehman seat weighs 6 lb even though it is cast aluminum which I think makes it the heaviest.

I know there have to be other options. They have to survive being in the full sun without becoming so hot you get burned and I like them being a little bit "industrial".

FUN!
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Re: Sirocco - Soft Sand Trike

Postby moleman on Tue Feb 14, 2012 12:12 pm

Wow! looks awesome. I just have one question. "I was really able to save a lot of money by recycling abandoned snow bike parts I found on CL.", really? where did you find 'abandoned' snow bike parts? and are there any more?
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Re: Sirocco - Soft Sand Trike

Postby mrfritz on Tue Feb 14, 2012 12:34 pm

moleman wrote:Wow! looks awesome. I just have one question. "I was really able to save a lot of money by recycling abandoned snow bike parts I found on CL.", really? where did you find 'abandoned' snow bike parts? and are there any more?


The front tire and rim were on the Seattle CL. I got them for about 1/3 of the cost of new before shipping. I also picked up a set of snowcat rims and 2.5" hookworms from the same guy. These parts show up pretty frequently as seasons come and go and riders upgrade, downgrade or simply get out of the sport. They're nice parts compared to the typical wide chopper bike rims, double walled etc... I do scan CL pretty regularly and will post when I spot stuff in the future. I may have just gotten lucky but when I started thinking of this build they were there along with some larger ones I couldn't have fit in these forks.

I just ordered the Lehmann's aluminum seat. I have never bought from them and been disappointed and even though it's probably heavier than the others it's really not going to matter that much after the electric drive goes in.
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Re: Sirocco - Soft Sand Trike

Postby mrfritz on Thu Feb 16, 2012 9:11 am

Had to work late last night. I heard from Colin that it's now a rider.

Today I have business travel so... So I guess I'll do a few sketches for myself of the electric drive and the articulated two seat/wheelchair/walker trailer.

If I get lucky I'll even have a chance to walk along the beach I imagine this bike being ridden on this weekend. :D
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Re: Sirocco - Soft Sand Trike

Postby lildietz on Thu Feb 16, 2012 6:27 pm

I'll be following this closely!
Support your local bike shops. Pay a little extra, whatever.
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Re: Sirocco - Soft Sand Trike

Postby mrfritz on Wed Feb 22, 2012 11:20 pm

Went for a ride, well brief pedal is a better description. The aluminum tractor seat arrived and I can see how to mount it. I ordered a few more pieces. A "minoura besso mount" for the shifter, it's going to go on seat tube. A maxi suspension seat post to put under the tractor seat. We talked through the motor/controller mounting and I have to measure the batteries so I get the platform height right for 36V gel/LiPe/NiMh battery packs.

I wasn't able to get the hub to engage in reverse. Not sure what's going on there but I'm not going to worry about it until the shifter is installed.
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Re: Sirocco - Soft Sand Trike

Postby kingfish254 on Sat Feb 25, 2012 10:32 pm

This trike is so WICKED!!!!
I sooooooo want to ride Fugsley with it!!

MO FATTA
MO BETTA

I may check back with you on details on how you adapted your hub for the trike.
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Re: Sirocco - Soft Sand Trike

Postby mrfritz on Sun Feb 26, 2012 12:43 am

kingfish254 wrote:This trike is so WICKED!!!!
I sooooooo want to ride Fugsley with it!!

MO FATTA
MO BETTA

I may check back with you on details on how you adapted your hub for the trike.


Fugsley was big inspiration to get me started! I got the moxi-spring seat post for this today. I'm hoping to have the trike out on sand here in Seattle next weekend. I will post more pictures of the mount, but ultimately it's just a plate welded to the standard hollow hub driver and some bolts through the plastic wheel.

Eventually will end up in Carpinteria CA moving mobility impaired people across the soft sand. I bet Fugsley could help with that too.

FUN!
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Re: Sirocco - Soft Sand Trike

Postby RAT Motorsports on Sun Feb 26, 2012 8:38 am

Awesome looking! On the seat, you mentioned using it at te beach, that tractor seat might get pretty toasty sitting in the sun all day.
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Re: Sirocco - Soft Sand Trike

Postby mrfritz on Tue Feb 28, 2012 10:49 am

RAT Motorsports wrote:Awesome looking! On the seat, you mentioned using it at te beach, that tractor seat might get pretty toasty sitting in the sun all day.


Ok, you talked me out of it. I got a used one for now and ordered a brand new white plastic bmx seat. A few other parts arrived today.

Image

Hoping for time today to work on her.
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Re: Sirocco - Soft Sand Trike

Postby mrfritz on Fri Mar 02, 2012 12:32 am

Shifter fitted. Needed to fabricate a drive sprocket flange for the freewheel. electric motor mount figured out, waiting for a little fabrication. New seat arrived will fit it to laid back post.

Trip to Ikea tomorrow to pick up the seats for the articulated trailer/wheel chair hauler.
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Re: Sirocco - Soft Sand Trike

Postby kingfish254 on Fri Mar 02, 2012 8:10 am

How did you convert your hub to a trike hub with the extra sprocket?
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Re: Sirocco - Soft Sand Trike

Postby mrfritz on Fri Mar 02, 2012 8:43 am

kingfish254 wrote:How did you convert your hub to a trike hub with the extra sprocket?


The axle drives hollow hub wheels. One on side there is a flange with three holes that bolts to the driven wheel. That leaves the other wheel freewheeling on it's bearings. To mount the sand buggy wheels a new flange (larger diameter) was fabricated and drilled for 4 bolts (the plastic buggy wheel has 8 "spokes") and then bolted on the same way. I promise more pictures.

The buggy wheels mount on their axle the same way a hollow hub wheel mounts. The only difference was the the axle diameter of the buggies is 15mm and the trike kit was 5/8. Chucked up the axle adapters and bored with a drill. You could probably do it with a vise and a hand drill they are soft metal.
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