Is a 200 lb dry sled possible?

[AKrider]

This thread is turning out pretty cool! Pictures of sleds that I remember seeing over the years are being posted. I was thinking about that Phazer. I recall a photo posted on here that showed the bare chassis on a couple of saw horses. The struts were removed so it could run leaf springs. Is the 360 lbs wet or dry? It doesn't look like there is much left to remove off the sled. I'm guessing the running boards are aftermarket?

How light is the orange XP chassis? I'm thinking the XP would be the way to go for building a superlight sled, even though it is bigger than a Phazer. LRD got his 600 down to 380-385 lbs dry and it still had some weight that could have been removed in the body work. I wonder what a 550 fan with a mesh hood and side panels would take off the overall weight? I'm thinking weight could be removed off the 550 fan by replacing the plastic vent shrouds with aluminum. I also recall the stock gas tank was heavier than necessary due to the double lining.

 

[longtrack156]

This thread is turning out pretty cool! Pictures of sleds that I remember seeing over the years are being posted. I was thinking about that Phazer. I recall a photo posted on here that showed the bare chassis on a couple of saw horses. The struts were removed so it could run leaf springs. Is the 360 lbs wet or dry? It doesn't look like there is much left to remove off the sled. I'm guessing the running boards are aftermarket?
QUOTE]

360lb dry 414 full, running boards home made, one could probably save a bit of weight by going to a lighter tunnel, the Phazer tunnel is heavy. The reason for this project was to lose weight and make it smaller, the 27" ski stance makes it great for boondocking in the trees.

 

[Ridin Ak]

....something like this??

so whats the price on something like that? i am guessing LRD is saying 8k for just the tunnel and gas tank? or is that with all items listed? either way very trick stuff that will take sledding to a whole new level..so with the mods that LRD listed what would the pull feel like with a 120hp 6 hundo (i know a low number) that weighs 350? would it pull like a 200 hp 550 pound twin (guessing on weight and hp) or would it feel like a whole new animal?

 

[rsss396]

not to beat a dead horse but if you wanted to get crazy you can turbo a single cylinder for some big horsepower.

I have a dyno sheet from a Honda 250R based motor with a CPI Sabertooth 500cc cylinder turbo charged making 151hp. I t would have to be detuned for reliability but 100hp would be a pretty safe tune on good gas.
For the coasting part there is a clutch made by Rekluse that disengages the clutch at low rpms by using ball bearings and centrifugal force.

Infact I have one to sell that guy with the cr500 powered sled

the dyno graph is below and this is rear wheel horsepower not crank horse.

And the cr500 65hp rating is at the crank not the rear wheel so this shows you how much power this motor makes!

 

[tollen77]

I honestly don't think any thing would be gained by dropping the sled weight. Everything that has been considered doesn't make it perform any better.

This is how I am looking at it (note im am using these numbers hypothetically):
160hp sled that weighs 500lbs has the same power to weight ratio as 80hp sled that weighs 250lbs.........so now u really don't gain anything. In my mind a one cylinder machine isn't going to do the trick.

These next figures are off of TracksUSA's website:
15x121x2 challenger track gives u a surface area of 1815 sq.in. and weighs in at 45 lbs, thus giving u .0247931 lbs/sq.in.
15x151x2 challenger track gives u a surface area of 2265 sq.in. and weighs in at 54lbs, thus givin u a .023841 lbs/sq.in.
What I conclude here is that just because u have less hp and can use a shorter track doesn't mean u have greater flotation....u would still be better off with a longer track.

Its almost like comparing apples to oranges. If u want a light weight sled that has a short track I think one would be better comparing a sled in that category and finding a way to make it lighter without comprimising performance. Same goes for a sled with a long track.

Just my thoughts....got a lot going thru my head how it may or may not be beneficial.

I know this is an old post but you really need to include the weight of the rider, gas, etc... Not too many remote control sledders out there running on empty.

160hp - 500 lb wet sled plus 180lb rider = 4.25lbs per hp

80hp - 300 lb wet sled plus 180lb rider = 6.0lbs per hp

113 hp required to get the same power to weight ratio of a fully loaded sled. But the light sled would sure be fun to ride!!!

 

[sci]

Here are 2 Xp's that we built the asphalt sled has a MRE triple with triple pipes and carbs it weights 375 ready to race! The other XP has the factory bulkhead and a 800r motor twin pipes and big big carbs and weights around 345 ready to race both have stock body work which I'm working on a carbon fiber solution to save 10- 14 lbs off the ashalt sled.

 

[sci]

twin 800r

 

[tollen77]

I came up with a list of parts to drop over 100 lbs. Expensive, yes.... but fun!!!

Carbon Sled Parts - Carbon Fiber Silencer - 15 lbs
Oil Injection Delete - 10 lbs
K&N - Air Filters - remove both air boxes approx. - 10 lbs
Belt Drive instead of chain case approx. - 5 lbs
E3 - Carbon Fibre XP Chassis - 21 lbs
E3 - Carbon Fibre XP Gas Tank - 9 lbs
Fox Float X Evol Shocks - 8 lbs
Alternative Impact - Ti A-Arms Kit -7.5 lbs
Alternative Impact - Ti Swing Arm - 4 lbs
Tom’s - Evolution Air Rear Suspension Kit -10 lbs
BR Tech - XP Hood w/ Headlight Delete Pod (Clear) - 15lbs
BOSS - 2010 XR1200 Seat - 1.0 lb

TOTAL - 115.5 lbs


That should get a 146" XP down to around 310lbs dry!!! All for only $10K!!!

 

[AKrider]

Tollin,
You bring up a good point about rider weight. That does set a lower limit for horsepower regardless of how light you make the sled.

Longtrack,
I'm really surprised by the weight of the Phazer. It is a real eye opener for me to see how challenging it is to reduce the weight on a stock sled. Just by looking at it, I would have assumed it was lighter since it is so stripped down.

 

[AKrider]

Any more pics of the asphalt sleds?

 

[sci]

sure

 

[Bullheadmoto]

"There was a sno scoot at Haydays that was 250lbs. 20 hp...."


Yep, here it is.... actually can get it down to about 230ish(no gas rack, CF muffler, no bumpers, single headlight, etc).

200cc, 13,000 rpm 4-stroke scooter race engine. No match for the bigboys, but fast, flyweight, and tons of fun!

Love that 345lb race sled - yeah baby!

BHM

[/IMG]

 

[sci]

Thanks Tony.

Dale

 

[NINJIN]

Here are 2 Xp's that we built the asphalt sled has a MRE triple with triple pipes and carbs it weights 375 ready to race! The other XP has the factory bulkhead and a 800r motor twin pipes and big big carbs and weights around 345 ready to race both have stock body work which I'm working on a carbon fiber solution to save 10- 14 lbs off the ashalt sled.

I watched phil build the 1000 over the coarse of this summer....Soooo nice inspired me to build a tube tunnel for my wedge chassis! unfortunately not half ti like yours, college kid budget is limited lol.

 

[Going West]

A timber sled suspension and float shocks on a 20 hp sled what a joke. I know how to wast money as good as the next guy but this is border line mental. Whats the power to weight ratio 12.5lbs/hp, yeah sounds like loads of fun. Looks like the most expensive pocket bike ive ever seen. JMO

 

[tollen77]

A timber sled suspension and float shocks on a 20 hp sled what a joke. I know how to wast money as good as the next guy but this is border line mental. Whats the power to weight ratio 12.5lbs/hp, yeah sounds like loads of fun. Looks like the most expensive pocket bike ive ever seen. JMO

it's for kids jack-a$$!!!

 

[Customization]

can ibe ur son please

 

[snowmobiler]

 

[Lambert454]

Theirs all this talk of ubber light sleds. Lets see how light a mountain sled can really get. Post your true dry and wet weights of you modern mountain sled.

 

[Going West]

it's for kids jack-a$$!!!

Oh, that makes a big difference, then the hi-performance skid and fox float fronts are a must.