777 HAUL TRUCK (1/12 size)

[doodlebug]

Have you talked to a tire store, about urethane fill for your truck tires?
Cheers, Neil.

[RCP57]

I think he should put the tubes back in and run nitrogen... Don't want that tire pressure to change with all that heat build up while hauling!

[DADSGARAGE]

Originally Posted by doodlebug

Have you talked to a tire store, about urethane fill for your truck tires?
Cheers, Neil.

OK...so it's my turn to be "tired and stupid"...LOL...never heard of urethane filled tires..tell me more!!

[DADSGARAGE]

Originally Posted by RCP57

I think he should put the tubes back in and run nitrogen... Don't want that tire pressure to change with all that heat build up while hauling!

Right!! Forgot about that.....heat build up in haul truck tires is bad!!! I will have to consider that....hate to blow a tire knowing this thing has such a "blistering speed"...more likely heat build up from carrying a heavy empty @$$ truck...

[RCP57]

Originally Posted by DADSGARAGE

Right!! Forgot about that.....heat build up in haul truck tires is bad!!! I will have to consider that....hate to blow a tire knowing this thing has such a "blistering speed"...more likely heat build up from carrying a heavy empty @$$ truck...

Yeah you wouldn't want it to burn up like that haul truck at the Meadowbank gold mine!

[DADSGARAGE]

Originally Posted by RCP57

Yeah you wouldn't want it to burn up like that haul truck at the Meadowbank gold mine!

Nope....truck/tire fires are no fun....they burn for days....

[doodlebug]

Originally Posted by DADSGARAGE

OK...so it's my turn to be "tired and stupid"...LOL...never heard of urethane filled tires..tell me more!!

http://www.pathwaypolymers.com/www/docs/164/

http://blog.otrwheel.com/what-is-pol...-does-it-work/
Go talk to a tire dealer that handles forklift and industrial/construction tire's, and they can give you more detail's, I don't think you need more than an "8"
on the durometer scale, but inflate your tire's to the desired pressure, and tell the dealer to match it with the fill. Spray foam at home depot is NOT the same stuff.
Hope this help's
cheer's, Neil.

[Trucker_Jo]

We have an old lawn mower that we use for towing trailers around the property. We had a tire shop fill the tires with foam. We still haven't had any problems with the tires even with the chains and a load on. So i'm sure whatever they used will work for you!

[DADSGARAGE]

Thanks guys for the tire fill info......that would be a good solution......the only draw back might be the added weight,not like this thing is a feather weight now...lol....

[DADSGARAGE]

Didn't get much done in the last few days other than work on the fuel tanks....sorry no pics yet...oops...
So here is a recap of the truck and a list of suppliers

Truck size...
Length- 32"
Height - 16"
Box width - 17.5"
Weight- Hard on the back....lol

Steering servo (3.5 turn winch servo)
http://hitecrcd.com/products/servos/...-servo/product

Servo gear (12T -32P)
http://www.servocity.com/html/32p_hitec_metal_gear.html

Box hoist (9" - 35lbs linear actuator)
http://firgelliauto.com/product_info...products_id=13

Two speed controllers (one for drive,one for hoist)
http://www.robotmarketplace.com/products/0-SYREN25.html

#25 chain and sprockets
http://www.robotmarketplace.com/prod...s_main_25.html

Geared motor
http://www.robotshop.com/ca/en/baneb...motor-kit.html

http://www.robotmarketplace.com/products/0-PDX256.html

Tires and rims
http://www.princessauto.com/pal/en/S...mbly/8442410.p

[Espeefan]

Originally Posted by DADSGARAGE

I take it you are suprised at the weight....LOL...told you it was heavy!!!!

( when it is finished I will get the actual weight...I'm only guessing on the weight being 85-90lbs...but my back tells me I'm close!!! )

The weight on the 1:1 777D is 142,573 lbs so if I did the math right the 1/12 model should be 82.5 lbs ??? So it may end up being a bit heavier than it should be in terms of scale....good thing this is a 1/12"ish" size and not 1/12 scale...LOL....

I am surprised how heavy it is, or will be, but then again it is a big model! Seeing it sitting on your lift table really helps put it into perspective for me, since we have many of the same sized lift table all around work.

At least you might be the first to say even the weight was accurately scaled down!

[DADSGARAGE]

This truck is turning out to be much heavier than I thought....yikes...cutting it from solid material is a big reason for the added weight, at least something might be close to scale.....lol

[Ashrod]

From my experience with racing go karts where the tires have to reach an optimum operating tempature of 165* F, when I ran tires with air or nitrogen they both reacted the same as far as how much air pressure was increased and it also took the same amount of laps to build the same heat and air pressure!!! With all that being said, I would look into foam filling the tires to achieve what you want!!! Also my wife's new nissan cube dropped air pressure from the recommended pressure of 44 psi to an average of 20 psi when the cold weather set in, and they are nitrogen filled also!!! Hope this helps!!!

[DADSGARAGE]

Made a new cab today (cut from 14ga)....needed to make some changes...so I added holes to attach the windows and the grab bar at the same time. Decided to use fasteners to attach the windows....the upper portion of the cab will be painted black so the fasteners shouldn't stick out to bad....


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[RCP57]

Nice! So jealous!

Maybe you should get some button head screws???? Not picking, just a suggestion.

[DADSGARAGE]

Thanks.....button heads would most likely look better....don't have any that small...yet...lol

[doodlebug]

Metal origami, That's a neat way to build!

Cheer's, Neil.

[D8R]

Originally Posted by DADSGARAGE

Here is short vid of the truck...it is a bit slow but it will have to work for now....

MERRY CHRISTMAS EVERYONE !!!!!


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To me it looks like you have got the correct speed, to often models are runned to fast!

Very nice model you are making, interesting way of solving the ribs on body!
A tripple 7 have always been a favorite for future modeling project, did find a 2nd hand model in 1/87 from CCM yesterday, can be useful for reference.



/Dan

[DADSGARAGE]

Originally Posted by doodlebug

Metal origami, That's a neat way to build!

Cheer's, Neil.

Metal origami...lol...never thought of it like that before...but your right, thats kinda what it is

[DADSGARAGE]

Originally Posted by D8R

To me it looks like you have got the correct speed, to often models are runned to fast!

Very nice model you are making, interesting way of solving the ribs on body!
A tripple 7 have always been a favorite for future modeling project, did find a 2nd hand model in 1/87 from CCM yesterday, can be useful for reference.

/Dan

Thanks Dan glad you like it.......having a die cast model would be very helpful..having some actual drawings to work from would be even better!!