I want to see this diagram.. Is she hot ?
Are we still talkin about Tundras?Surrounding it with those cushy shiny posts & velvet rope things like they used to have for lineups at the bank might work.
Everything Drolet Tundra - Heatmax...
- Thread starter brenndatomu
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DoubleB
Minister of Fire
This is probably quite disappointing. Overly simple analysis that doesn't account for many factors. And it doesn't show much skin, either.
Wf is weight of the furnace at a given location on the blocks, which are 8" wide.
![[Hearth.com] Everything Drolet Tundra - Heatmax...](https://www.hearth.com/talk/data/attachments/163/163256-79c72af18d99c0340ac4831e17e690cb.jpg?hash=0emxoWsByD "[Hearth.com] Everything Drolet Tundra - Heatmax...")
Matt78
Burning Hunk
Eww...algebra
Hey, any of y'all had to replace your Tundra/Heatmax door gasket? I wondered what density of gasket it is?
I see the parts list show it as a 3/4" x 7'...
I wonder if you applied that same force to the top of the furnace, would it tip over as well?
DoubleB
Minister of Fire
Hmm, the plot thickens... Good call, @Highbeam , I think that's a more accurate analysis, and unfortunately more dangerous. This shows the realistic case where the far side block tips along with the furnace. Moment arm of the applied force is 55 inches above ground (furnace plus block heights), and moment arm of the furnace weight is only 13 inches (half furnace width).
![[Hearth.com] Everything Drolet Tundra - Heatmax...](https://www.hearth.com/talk/data/attachments/163/163391-78b3cfd62d94ef5633212f8c7a7edd92.jpg?hash=TF2te3SOU0 "[Hearth.com] Everything Drolet Tundra - Heatmax...")
This suggests the furnace will tip at 130 lbs exerted sideways. Push at an up angle and less force will tip it. Also, push on the front corner and it might not take much to tip because now you're twisting the furnace about a vertical axis, which might help get things going. The connected ductwork should help resist, but I don't know how much.
So, the bad news is that the furnace will tip with much less force than I previously thought. Astute observers may note that the same analysis above suggests the rest of us with furnaces near the ground could tip them with only a little more at 183 lbs (39" high / 13" wide * 550 lbs).
This may be true, however furnaces on the ground are still harder to tip over because the center of mass raises higher (requires more energy/effort) in order to exceed the threshold that tips over vs. falls back home. Also, if a furnace on the ground does tip, there is 16" less inches of potential energy to cause damage to anything that might have a chance at survival.
Point is, I'm a bit leery again, and I'd wager that I could tip it over on 16" blocks with a smart shove in the proper location/direction.
Wisneaky
Minister of Fire
I had mine up on blocks and I'm a big boy and took all I could do just to try and tip it on it's side so my wife could slide the block a little more under it. You'd have to hit it with some serious force to tip it over. Maybe if your drunk and stumbled from 5 feet back and plowed into it big time that maybe it would move a few inches. If that does happen I hope someone gets it on video.
DoubleB
Minister of Fire
I like a good analysis on paper, but real-world results are more important, and your example seems pretty hard to argue with.
Sounds like a good job for a crowbar and a chunk of 2x4. But we're glad you didn't otherwise you wouldn't have the above example!
Sounds like a good job for a crowbar and a chunk of 2x4. But we're glad you didn't otherwise you wouldn't have the above example!
JRHAWK9
Minister of Fire
Eww...algebra
Hey, any of y'all had to replace your Tundra/Heatmax door gasket? I wondered what density of gasket it is?
I see the parts list show it as a 3/4" x 7'...
that's more like physics/statics.......
Wisneaky
Minister of Fire
I don't know what it is. I just know I don't understand it. I'm jealous. I wish I did though.that's more like physics/statics.......
JRHAWK9
Minister of Fire
Using your formula i come up with 160 lbs i am using 16 not 13 so 16/55 X 550 = 160LBS ..I have no reason to question your formula, i'll be darn if i can remember how to come up with the formulas its been over 20 years since the last time i was sleeping in class. Looks like i need to install some 200mph duct tape. The reason i used 16 is because the center of the furnace leg is on the center of the block not the outside edge which widens my base.
Well now onto an update my return plenum with filter has been made should hopefully have it installed this weekend. It cost me $100 to have the plenum with filter slot made sure beats what Drolet is asking for just the filter attachment
DoubleB
Minister of Fire
Eh, probably don't worry too much about my geek stuff. By now I'd use @Wisneaky 's formula in post #432:
effort required to tip furnace > big boy + rescuing precious wife from certain death
If you want a little extra insurance, put up those fancy brass posts with red velvet rope that @maple1 is going to send to you after he requisitions them from his bank.
Now, let's see what trouble I can cause about gasket density...
What I was getting at is that whether the furnace is up on blocks or setting right on the ground, a similar force is required to knock it over. Following that, the additional risk caused by putting your furnace up on blocks is negligible.
Wisneaky
Minister of Fire
I personally think it is better to have it up on blocks. Easier to load since you don't have to bend over as far. If you do get water in your basement or water heater leaks your less likely to have the blower damaged because it will be off the ground also. I wouldn't worry about it tipping over, just make sure it's stable. Give it a little bump test to make sure.
maple1
Minister of Fire
I don't think so - the higher it is, less force that is required?
EDIT: But it also might depend on how or if your furnace is attached to the blocks.
EDIT EDIT: Yes, most definitely. I think.
Oh no, you need to assume the same height of impact above ground to more accurately simulate an impact from a ground mounted dude falling into it. I know it won't be the same but pretty close.
Wisneaky
Minister of Fire
Someone should tell SBI right away that it is going to probably have the same cracking issues because they didn't put firebrick in the front again.
It does appear that way. Surely they are not dumb enough to go down that road again. Of course the PSG Caddy line has no bricks there and they are fine. There are quite a few changes here from the Tundra so I'm sayin they are figuring it's handled. Pretty cool plenum...
Wisneaky
Minister of Fire
It does look like a nice furnace. Unfortunately I won't be one of the first hundred to own one this time. I'll wait until they sell a thousand before I decide so they get the bugs worked out if there is any.
