Rollercoaster 2dof build plan

Hi guys. New to the forums but have been lurking for awhile.
Im now wanting to dig into a 2dof build with it being used for rollercoaster simulation only with a htc vive or oculus rift.
Here i have a basic drawing of my idea and am wanting some advice on my design from all you experts!
So basically looking at my design im wanting to get the most angle out of the seat as possible to really feel like your going down and up the dips of a coaster. To do that i have placed the seat quite high off the platform around 20cm. The users feet wont touch the ground and will also hang over the front for the dangling feeling. I was thinking of using the motion dynamics worm drive motors but looking at there 50:1 or 60:1 gear ratio for the extra torque needed to pull the seat back up from large angles of descent and ascent im looking at getting. To compensate with the lower rpm of the higher torque gears i would have a longer lever arm at around 15cm?
Also i was wondering with my motor position almost close to horizontal to shoulder height will that also help with less stress pushing and pulling the seat with a person on it? Or would the typical 15 degree angle most people use do the exact same thing?
Please let me know your thoughts and ideas. Thanks guys!

Hi @Cale good luck with your build, I think you will lose out on sway and roll motions with the motors so high.

+1 with @Daguru the engines will give their best performance by being lower, or even under the seat if they are sufficiently powerful.
What motorization do you have?

Thanks for the replies guys. So noorbeast you think that a compact design with the motors mounted under the seat with them bolted to the thigh height of the seat would be the optimal position for me to get the best motion and biggest angle for going up and down dips? Would you think rear or front mounted motors would work better. Your link showed a compact design with front mounted i noticed.
Also the motors im looking at are the motion dynamics 200w 50:1 64rpm 30 torque. Do you guys think that would be suitable or should i go for a 60:1 and slightly less rpm. The angle i can make the chair move with someone on it is very important. I really want to feel like im goingup and down the coaster.
Thanks again.

With such motors the best implantation is the motors under the seat, placed at 90 ° from each other.
Two possible locations:
- One motor per axis (no mixing of Picth and Roll movements, easy focusing)
- By shifting the two axes of 90 ° collaborative engines (mixing of movements, energy saving)

Thanks again noorbeast. I have started looking at your dx racer and am loving the build. A few more questions. I wont be using vr for a little while so i will also be using a arge tv screen in the mean time so i would like alot of movement. With a 50:1 or 60:1 gear what type of angles could i get whilst also being able to comfortable pull an 85kg person back to a neutral position on the seat?
Would a front or rear mounted motor work better for getting better angles of motion?
Would the 50:1 30nm torque 64rpm be better for pulling the weight from large angles or the 60:1 36nm torque 54rpm?
Thanks guys.

I didnt realize you were also in Australia noorbeast. I have been reading through your compact 2dof build and am admiring the craftmanship. I think i will use it as inspiration.
So basically your saying i should be theoretically ok with pushing and pulling 85kgs if i keep it under 40 degrees. So if i was to create a lever with a few different holes to go from 35 degrees down to around 20 degrees and test the motors capacity to drive those angles that could work?
What motor out of the 2 i mentioned would work best for maybe 35 degrees of motion one way? If i can go the 50:1 that would be great so i can gain some extra rpm but am happy to use a 60:1 if needed.
Thanks again.

I follow you now noorbeast. So my lever which is connected to the motor cannot go more than 40 degrees either way or i will suffer large mounts of torque loss. So i basically have to stay within those parameters.
I dont understand how my design affects the outcome of my seats maximum angles it can achieve?
If i put my pivot point basically in the centre ofmy chair platform which it will basically end up being as i only have a chair with a person on it and no pedals or wheel attached wouldnt that mean my levers would then dictate how far i can tilt my seat as i would mount the levers to the back of the chair at thigh level.
Thanks.

Very clear now noorbeast thanks.
So im probably looking at the 60:1 gear if i decide to put the lever closer to the balance point and the 50:1 if i go further out eg the back of the seat.
Where did you buy your jrk 12v12 and hall sensors from noorbeast seeing as your in australia we would probably buy from the same place?
Thanks.

Thanks for all the help so far noorbeast. I will now take the advice and start an indepth plan for my build.
I will be back.

@noorbeast i was wondering what size your aluminium was you used for your framing of the compact platform you built. Also the thickness of the aluminium?
How did you go about cutting the aluminium. Did you just use a hacksaw?
Thanks.

Noorbeast as im going to be mounting the motors behind the chair and having the levers attach at thigh height is there any benefit to attaching them further out from the back of the chair or closer in?
I have attached a picture for reference.
Thanks.