Notorious Tail scraping/grinding

[alphalima]

Shaved the tail off my chassis, so I replaced it with an M2C. Thankfully put on the RPM skid plate in the new chassis, but the one pictures is 1/2 a battery pack old.

I’m jumping off a ramp on soft grass. Do you think this is from the ramp or landing?

And any modifications/suggestions on how to avoid? Currently stock shock oil, height, etc.

 

[GraniteFox]

Heavier weight oil maybe 60-70k or higher. You can also adjust the droop to give you more travel. If the front shocks have too much tension then the back will squat more under load thus scraping the rear. I find the stock springs are too soft in the rear and too much tension in the front. I do not use much preload in the front and about 1/2 or more preload in the rear. Hope this helps.

 

[alphalima]

Very helpful. I need to change oil.

Droop is about all the way in.

 

[Monster Dork]

That's the ramp. Do you have grip tape (sandpaper) on it or something? Landing slaps are flatter, the angle of the worn spot on your chassis indicates hitting the transition and departure lip on your ramp, over and over. That looks like some rapid wear!

 

[alphalima]

Yup, there is grip tape and it’s shredded. I thought that was from the tires spinning it off. I’ll remove it.

Ruined two chassis with that crap. This is the ramp:
https://en.kc-rc.com/product-page/rampe-ajustable-pré-commande

 

[GraniteFox]

Bingo.

 

[alphalima]

I’m sure this one was painfully obvious to you guys. I honestly didn’t think I was close to bottoming out on the ramp.

I’m changing the oil right now and I can’t believe I put this off. 80wt is what I have. What a noticeable difference.

Thanks as always for the help.