13HP Reverse Trike

[Carlman]

Gday all.

My new project will be a reverse trike (1 driven wheel at rear and 2 wheels up front).

Specs:
Engine: 13HP Briggs diamond I/C with cast iron bore (vertical shaft). Electric start or pull start.

Drivetrain: Either single speed 1:2 RAGB or a 5 speed tranny, belt slip clutch to RAGB and chain drive to rear wheel.

Wheels: Two front kart wheels and tyres (5" rim 6" wide") and one rear kart wheel and tyre (5" rim 8" wide").

Brakes: Hydraulic disk on rear wheel.

Speed: If I use the single speed I will gear it to do about 70km/hr and if I use the tranny top will be the same except i will have various top speeds for each gear.

Matierials: Box tube construstion for the frame, mild steel plate for the bearing hangers, aluminum check plate for floor.

Attached are some printscreens from my sketchup model of the trike (I imported the front end from another kart).

I will most likly use a nice strong cast iron RAGB so i can just dump the clutch and such, the tranny is a Peerless 700 which will hold up just fine but i want to keep it simple stupid ya know?

I will add pics of my engine and gathered matierials so far tomorrow.

So what do you all think?

 

[mike75925]

looks nice, however i don't see it working to full power. the more drive line the more power gets lost. looks like a racing gokarts tire for the rear. i might try a three wheelers front wheel adapted for a sprocket, just me

 

[Carlman]

This is going to be a tarmac machine and i wanted slicks. i can get used kart tyres for free so i went with this route. The driveline is a couple of pullys some spider gears and a chain not much to it.

Also the 13hp tourque monster should handle it fine.

 

[Carlman]

Anyone else care to comment?

 

[mike75925]

are you using a clutch on the belts? auto tensioners? what type of belt, regular v-belt?

 

[Kaptain Krunch]

I like the plans, I would use a RAGB, it would be both stronger and simpler than a 700 series. What displacement is that briggs 13hp? If you dont know, just post up the model# and i can tell you.

 

[Carlman]

Im going with a homemade tensioner clutch like a mower, reenforeced V belts will be used yes.

Ive founf my RAGB, its a very simple and compact high touqure 1:1 unit that has both shafts as female 1" keyed.

Option 1: So basically i am going to bolt that via a plate to the bottom of my 13 hp, efectively turning it into a horizontal shaft!

The box is only about 20cm by 10cm by 10cm.

My tensioner will be between that output and the axle.

Optoion 2: Make the clutch between the engine and the RAGB and have chain to the axle

Option two is more likely at the moment.


EDIT: Around 450cc from memory mate ill post pics of it all tomorrow.

 

[Kaptain Krunch]

Im going with a homemade tensioner clutch like a mower, reenforeced V belts will be used yes.

Ive founf my RAGB, its a very simple and compact high touqure 1:1 unit that has both shafts as female 1" keyed.

Option 1: So basically i am going to bolt that via a plate to the bottom of my 13 hp, efectively turning it into a horizontal shaft!

The box is only about 20cm by 10cm by 10cm.

My tensioner will be between that output and the axle.

Optoion 2: Make the clutch between the engine and the RAGB and have chain to the axle

Option two is more likely at the moment.


EDIT: Around 450cc from memory mate ill post pics of it all tomorrow.

Sounds good, i'd go with option 2 personally.

As for the displacement i was just wondering weather or not it was the same as the briggs 11.5, 12, and 12.5 (all are 28ci)

 

[PyroKart]

sounds cool but i would have made it with either A. shocks or B. made it look like a mc. Would use front end of four wheeler for shocks and if you are set on raod tires i assume that the hubs on a fourwheeler would match that of some other type of tire. but thats just me.

 

[SpyGuy]

Nice design, looks fun. (What program did you use, Google Sketchup?)

From a safety POV, I wowuld suggest front brakes, as well. Sometimes having just the one brake doesn't cut it.

Triangle bracing from seat back to rear wheel mount. You're going to want it good and solid, may as well plan for it now. Also would help protect the engine a little, and provide a place for mounting a gas tank (if not already mounted on the engine).

Keep us informed on the build and updates.

 

[Carlman]

KK: Yea probobly is the same aye

Pyro: its a road kart, it doesnt need shocks...
Why would i use quad hubs when i have perfectly good kart ones... So basically you reject my desgn and want to substitute your own?

SpyGuy: Thanks mate! Yea sketchup was used.
Not sure how one would hook brakes up to the front as im using hubless kart wheels..
This was just a basic design, triangle bracing will be used for sure in the end result

 

[EagleTalons]

You could use dual drum up in the front. Look real nice and you could have a locking brake pedal like a tractor! So you could turn on a dime using one pedal!!!

 

[BradenM]

Look mate, Tadpole trikes, as they are called, are prone to rolling from cornering at even the most benign speeds-try 25km/h. Your going to need about 5-7 degrees negative camber.
I race tadpole trikes with pedal/petrol compulsion over a 24 hour period; this video has some crashes and rollovers.

http://www.youtube.com/watch?v=RGblVQlpILQ&feature=channel_page

 

[Carlman]

Yea but look how skinny those trikes are mate...

Check out this video: http://www.youtube.com/watch?v=AEVN1Tuod60
Mine will be low like this one, i dont plan to turn sharply unless its in the wet to slide.

 

[theo]

Balance is important with a reverse three wheeler. Before you build check this site.

http://www.clevislauzon.qc.ca/Professeurs/Mecanique/ethierp/3-wheels/stabil1.htm

 

[PyroKart]

carlman i am sorry if it came across that i rejected your desighn i honestly did not mean to. I did not mean to make your road cart into an off road one just for some reason (maybe because i just saw a pic in different thread) thought it would be cool to see a more motorcycle looking trike. I think your design is great and hope it turns out well.

 

[Rotore]

nice work dude should make it look like a t-rex

 

[EagleTalons]

I personally think you should have a rollcage.

 

[Kaptain Krunch]

I personally think you should have a rollcage.

and a cup holder.

 

[Tommy Boy]

So do I.

Good luck with the build, by the way! Something to notice (if you didn't already) is the inherent issues with the configuration by design alone. Watch the guy make his corners. Limited distance, limited speed. And he dips the frame into 2 wheels in multiple instances. Secondly, due to what I'd assume is all the functional weight being in the rear of the kart, the rear drifts from the drive tire breaking loose from the centrifugal force applied from a turn.

Not to blow turds on your idea, as it looks like it can be a regular hoot to drive. But be aware, this thing is going to be squirrelly as hell in the corners, both from torsional and centrifugal forces. Great on the straights, though. And given your powertrain set-up, what you have available as far as parts, and the similarities between the builds, I think you'll find a 4 wheel cart with a balanced weight profile will give you the best of both worlds. Power and speed, but with the stability you'd want with a road cart.