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Bob Stormer, scratch built Monster Project.

Bob Stormer, scratch built Monster Project.

Old 01-11-2010, 04:43 PM
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Servo arm:

This was more involved than it looks. 1/8" aluminum, 3mm metric hardware to hold it to the original Hitec servo horn (I like small metric stuff, more teeth per inch). Studs for the rod ends are 3/16" or 10-32.

For scale, I tossed a 1/12th scale servo in the one photo.
Attached Thumbnails Bob Stormer, scratch built Monster Project.-servo_saver_1.jpg   Bob Stormer, scratch built Monster Project.-servo_saver_2.jpg   Bob Stormer, scratch built Monster Project.-servo_saver_3.jpg   Bob Stormer, scratch built Monster Project.-servo_saver_4.jpg   Bob Stormer, scratch built Monster Project.-servo_saver_5.jpg  

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Old 01-11-2010, 04:50 PM
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Originally Posted by Bob-Stormer View Post
Decent idea and was kind of where the initial build was going. Couldn't find super skinny fronts and that about ended that. Plus, I really want to show of the cage when it's done and be able to drive it with the body off. I suppose I'm from the Indian Larry way of thinking where I like to celebrate and embrace the look of mechanical things, not hide them.
I wonder how many people know who Indian Larry was????
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Old 01-11-2010, 05:12 PM
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Originally Posted by KnR-Racing View Post
I wonder how many people know who Indian Larry was????
Just the right amount, those that care.
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Old 01-11-2010, 05:22 PM
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Front suspension:

First pic is the start of a tie-rod. I came really close to welding nuts on them, but it took away some of the clean and limited the amount of space for the shocks. Tie-rods ended up being about 6.5" long. I welded 3/16 nuts to the hollow tubing. Smallest thinnest items I've welded in a while. All the shock pics are mock ups. I'm still up in the air as to whether I'm going to mount them to the lower or upper arms. The'yre more correct on the lower arms, but look better on the upper arms as they tie into the upper frame, sort of ties it all together better. AND, it's getting heavy. I'd have more opportunity for weight loading if the shock were further out on the upper arm.
Attached Thumbnails Bob Stormer, scratch built Monster Project.-front_suspension_1.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_2.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_3.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_4.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_5.jpg  


Last edited by Bob-Stormer; 01-11-2010 at 05:34 PM.
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Old 01-11-2010, 05:37 PM
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Front Suspension:

more.
Attached Thumbnails Bob Stormer, scratch built Monster Project.-front_suspension_6.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_7.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_8.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_9.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_10.jpg  

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Old 01-11-2010, 05:39 PM
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Front suspension:

Front shocks are mocked up. I think they're going to end up on the upper arms, so I can push the lower end out to support more weight. Thing is getting heavy.

It looks almost ready to run. I bet it's not 1/3 done. I think it's like framing up a garage or a house. That first day when the walls and rafters go up makes it seem like you'll be done in about 3 days... 2 months later, you have it licked.
Attached Thumbnails Bob Stormer, scratch built Monster Project.-front_suspension_11.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_12.jpg   Bob Stormer, scratch built Monster Project.-front_suspension_13.jpg  
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Old 01-11-2010, 05:45 PM
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Front suspension:

Video of movement. Everything is still kind of loose, but it gives an idea of what it's likely to be doing. Looks like 2.5" of travel. Very little if any bumpsteer. Tie rod and suspension arms are similar in length.


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Last edited by Bob-Stormer; 02-13-2010 at 12:09 AM.
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Old 01-11-2010, 06:02 PM
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Originally Posted by KnR-Racing View Post
I wonder how many people know who Indian Larry was????
Originally Posted by Bob-Stormer View Post
Just the right amount, those that care.
Since Bob offered me a shot "behind the wheel" we'll see if he'll ride on it...standing and with his arms outstretched. Head tipped back and eyes closed.

Helmet mandatory.
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Old 01-11-2010, 06:06 PM
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Originally Posted by Scottrik View Post
Since Bob offered me a shot "behind the wheel" we'll see if he'll ride on it...standing and with his arms outstretched. Head tipped back and eyes closed.

Helmet mandatory.
Frame is plenty stout... should work just fine.

Last edited by Bob-Stormer; 01-11-2010 at 06:33 PM.
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Old 01-11-2010, 06:32 PM
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Rear Sprocket:

ansi 25 chain. Took the sprocket off of an electric scooter. using a 1" gokart disc brake hub. Turned down a lip on the hub so the sprocket would locate. Then drilled and mounted the sprocket to the hub.
Attached Thumbnails Bob Stormer, scratch built Monster Project.-rear_sprocket_1.jpg   Bob Stormer, scratch built Monster Project.-rear_sprocket_2.jpg   Bob Stormer, scratch built Monster Project.-rear_sprocket_3.jpg   Bob Stormer, scratch built Monster Project.-rear_sprocket_4.jpg  
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Old 01-11-2010, 06:36 PM
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Killer work Bob!

Indian Larry was the man. I agree that I like to see the 'workings' of machines.

Keep the progress up and the pics coming.
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Old 01-11-2010, 06:44 PM
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Rear swing arm:

Wasn't sure what I was going to do here. Because the sprocket is so big there is no clear way to connect the 2 sides of the swing arm. Ended up with 2 rods across the back to clear the sprocket. Made it pretty stiff. Not as stiff as I'd like, but stiff. Also, 20" out from the pivot point of the swing arm, the sprung weight of the back is about 20 pounds. That's without body, no cage, no mechanicals for the shocks or mounts, no batterys. That's a LOT of weight to add. I'm of the impression that the little Integy shocks won't have the spring power necessary to hold up the car and get me the kind of travel I want. When I hit the brakes, I want the car to really unload the back with lot's of movement, monster truck style. That requires pre-loading a soft spring with lots of travel. I have some ideas.
Attached Thumbnails Bob Stormer, scratch built Monster Project.-swing_arm_1.jpg   Bob Stormer, scratch built Monster Project.-swing_arm_2.jpg   Bob Stormer, scratch built Monster Project.-swing_arm_3.jpg   Bob Stormer, scratch built Monster Project.-swing_arm_4.jpg  
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Old 01-11-2010, 06:50 PM
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Rear suspension:

Rear suspension movement test. Everything lines up well, lot's of travel potential, and everything is very square and tight.

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ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 01-11-2010, 07:02 PM
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Rear suspension shock mod:

The little shocks won't work. I ended up using a fox mountain bike shock. They have notoriously heavy springs. This one is quite light, at 400 pounds. To get the travel I want, and support the estimated weight, I suspect it needs to be 1.75-2" out from the pivot point of the swing arm. So, here's the new mount and the modded swing arm to compensate. The bar in the second pic was welded to the front of the swing arm and is now the lower shock mount for the rear.
Attached Thumbnails Bob Stormer, scratch built Monster Project.-rear_shock_1.jpg   Bob Stormer, scratch built Monster Project.-rear_shock_2.jpg   Bob Stormer, scratch built Monster Project.-rear_shock_3.jpg  
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Old 01-11-2010, 07:07 PM
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I have used those shocks before and they are sprung really heavy.
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