Mc Taco
American Adventurist
I look forward to checking in on this build. Will be sorry when you're finished. But then you can post it in action.
Great turn of a phrase.
Great turn of a phrase.
Project Mini Hägglund
- Thread starter Steinbruchsoldat
- Start date
Stein,
Thanks for the info. I'll be gone over the weekend, and I'll be thinking on this one. I'd been thinking you could have brake-steer for the front unit, so you could run it solo. I guess with ram-steer, you might not be needing any side-to-side differential action. Interesting.
Thanks for the info. I'll be gone over the weekend, and I'll be thinking on this one. I'd been thinking you could have brake-steer for the front unit, so you could run it solo. I guess with ram-steer, you might not be needing any side-to-side differential action. Interesting.
chilliwak
Expedition Leader
Ok Steinez, I did not know the configuration with the left and right driveshafts. I understand now that you still can power up the rear unit. Super grinder you got, and now I am really excited about the Hågglund!:Wow1:I just wasn`t happy with the chains any more. Shafts will be much better... Where do you see a problem to power the rear car? Left axle shaft goes to the front, right to the rear...
Started removing the main beam today. It`ll be completely rebuild so the drive shaft is on the inside...
Got an awesome deal on this grinder:
Steinbruchsoldat
Explorer
Don`t worry, this will take quite a while until it`s finished. I think at least 1-1,5 years to go...
There`s no need to run it solo. Also brake steer is the worst way to steer a tracked vehicle and won`t work on a articulated vehicle...
This is how it`s sitting atm:
Time to start fabricating again, but will be building a notcher first...
deepmud
Adventurer
so early on I wanted to suggest you turn it sideways - but I don't like to make suggestions that would require tearing out/starting over - I feel unhelpful with that - but since you are sooooo brave (crazy? lol ) already 
- have you considered putting the engine and it's noise and weight in the back? I think a lighter front unit will climb up on snow better. erik
- have you considered putting the engine and it's noise and weight in the back? I think a lighter front unit will climb up on snow better. erikStein,
I'm just curious, so a few questions if I may.
Is brake steer so bad because you give up traction on the braking side? Is hydrostatic the only other real option for a single car steering system?
Could an articulated vehicle work with brake steer (or hydro steer) if you could brake both front and back unit simultaneously?
I'm just curious, so a few questions if I may.
Is brake steer so bad because you give up traction on the braking side? Is hydrostatic the only other real option for a single car steering system?
Could an articulated vehicle work with brake steer (or hydro steer) if you could brake both front and back unit simultaneously?
I'd assumed you kept the engine in the front unit to allow the front unit to be driven separately from the rear unit. But if the machine can only steer with ram-steer, both units are mandatory so the engine could be put in the rear car. Interesting idea. It also keeps the gas tank/driveshaft hazards further from the operator.
redthies
Renaissance Redneck
Don't take away all the chances for excitement!
Steinbruchsoldat
Explorer
Yes, when turning you`re loosing power to one track. Hydrostatic is the only real way for a tracked vehicle...
No it won`t. I tried this with a 1:10 model and it works like crap. I also wouldn`t feel safe driving without a fixed connection between both cars. I wouldn`t be able to control it...
Why should i do that? I`m building a articulated vehicle because i wan`t to be able to carry stuff. The front car supplies the power and the rear one is the carrier. With the engine in the rear car there`s no room in the front car and no room in the rear car. It`d be absolutely pointless...
Come on, i`m tired of that crap. There`s absolutely nothing dangerous about a driveshaft or gas tank. Ever seen an ATV/motorcycle?
Stein,
Thanks for your patience as I mentally work through problems you've obviously already addressed!!
Sorry, after I posted this, it became clear that this is not possible. Or it would take a really complicated bit for turning, since as you turn the front car, it would skew the rear car the opposite way (ala the wheels on a 4-wheel-steer vehicle). One car would have to brake one way and the second car the opposite way to initiate a turn, then both switch to the same side braking as you continued through the corner. I understand why you say it would work "like crap".
Okay, one last question on this. Does the original Hagglund have side-to-side differentials on each car's tracks? I can see an advantage to locking diff's., but won't constantly-locked diffs bind as you steer with the ram-steer? Or are you counting on a little "slip" on the ground?
Thanks for your patience as I mentally work through problems you've obviously already addressed!!
Sorry, after I posted this, it became clear that this is not possible. Or it would take a really complicated bit for turning, since as you turn the front car, it would skew the rear car the opposite way (ala the wheels on a 4-wheel-steer vehicle). One car would have to brake one way and the second car the opposite way to initiate a turn, then both switch to the same side braking as you continued through the corner. I understand why you say it would work "like crap".
Okay, one last question on this. Does the original Hagglund have side-to-side differentials on each car's tracks? I can see an advantage to locking diff's., but won't constantly-locked diffs bind as you steer with the ram-steer? Or are you counting on a little "slip" on the ground?
redthies
Renaissance Redneck
Don't take it the wrong way Stein, I was merely adding some humor to the tech talk. I've driven, ridden and flown some ridiculous contraptions and thouroghly enjoyed every minute of it. Your Häglund is going to be awesome when it's done!
postalWagon
Adventurer
FRONT page
Great work.
Looks like your shop and mini are going along well.
Great work.
Looks like your shop and mini are going along well.
Steinbruchsoldat
Explorer
This is one point but the main point is the missing rigid connection between both cars. Imagine driving on a slope and the rear car starts slipping downhill? How could you control that with brake steer? Really dangerous...
They have open diffs and this is the only real disadvantage besides the lack of power. Hellgeth, a german Hägglund company, designed some lockers to improve that. I also heard about some guys that locked them fulltime. I`ll just try if i get enough traction with open diffs, if not i`ll weld them, or i`ll try to build some lockers. We`ll see...
I know that, but it was mentioned to death by a lot of people, and i`m just tired of hearing it. Hope you understand that... :smiley_drive:
Steinbruchsoldat
Explorer
Started building a notcher:
Will hopefully be finished tomorrow, then i can start the new frame...
Will hopefully be finished tomorrow, then i can start the new frame...