Introduction: Tilting RC Model Vehicle

Picture of Tilting RC Model Vehicle

This model is a 1/10 tilting vehicle with two front wheels and one rear drive; was derived from an electric model RC Arrma Vortex 1/10 which was used the aluminum chassis and removed the entire back where he had placed the electric motor and its transmission to the wheels.

Also it represent in part a my project in scale 1/1 relative to the same tilting vehicle at a variable angle in which the inclination of the front wheels, at the same time steering wheels, takes place through a system of wheels and toothed belts.

The entire rear of the model has been resized from the support of the transmission that is from toothed pulley which receives the motion from the electric motor, from this toothed pulley the motion is transmitted, through a toothed belt, to the rear driving wheel.

This aluminum support (2mm thickness) is attached to existing mounting frame with M3 screws.

Again with the aluminum of 2mm thickness were made the two levers which support the two shocks absorber and the support of the rear drive wheel; the two levers were connected with two threaded rods 3mm.

With regard to the belt transmission I have used two toothed pulleys in aluminum, the first (50 teeth), the output of the gear of the original kit, the second toothed pulley which transmits the motion to the rear drive wheel has 40 teeth and is been sized to slightly increase the number of revolutions to the drive wheel itself to try to overcome the increased friction due to the new transmission system added.

Both toothed pulleys are keyed shafts have balls bearings and their supports; also the support of the rear drive wheel is made of aluminum 1mm thick and has been obtained using the hub of the original kit which have been linked to the wishbones to connect the hub to the same lever to the left.

With regard to the front was made a triangular aluminum (2mm th.) support to connect the two gears in plastic forming tilt the model through the rigid connection of the two front shocks.

Moreover has been necessary to change the front servo (steering) 3kg-cm torque by another 9kg-cm torque due to tilting gear system that needs to lean the model.

A particular reflection is about the long wheelbase due to the rear shocks position, this creates a long steering radius, in the same time to lock the shocks on rear axle I can reduce the wheelbase but I will get another swingarm lever; I can shorten the swingarm and hence the wheelbase decreasing the shocks inclination and in the same time preloading the springs.

For the wheels I could use 1:5 RC bike wheels (Ø125mm) for its round profile but I should adapt the hubs to a bigger hole of these wheels, instead I’ve used Arrma Vortex hubs, wheels and tyres.

The next step could be to make steering also rear wheel drive, need a ball joint; moreover the author is making the body shape of this RC model but also very important could be a SERIES PRODUCTION realized by the author or by some rc toys company interested to development and making.

DIMENSIONS :
Wheelbase : 460mm; Front Track : 250mm; Overall : 570mm; Weight : Unknown

Step 1: Step 1 : Start From Original Kit

Picture of Step 1 : Start From Original Kit

Before the disassembly of the original kit I started from a design for to understand how to make a tilting and steering system and then a rear wheel drive transmission system realized by a toothbelt.

Step 2: Step 2 : Front Disassembly

Picture of Step 2 : Front Disassembly

Disassembly of shocks and steering rods, while the aluminium front base will be straightned for to have a correct wheels geometry and need to assembly the tilting system.

Step 3: Step 3 : Steering Servos

Picture of Step 3 : Steering Servos

Disassembly of steering servos place and its leverage for to assembly a linking with front gears tilting system.

Step 4: Step 4 : Electronic Parts Disssembly

Picture of Step 4 : Electronic Parts Disssembly

Disassembly of receiver, electronic speed controller and motor wires.

Step 5: Step 5 : Electric Motor and Transmission Disassembly

Picture of Step 5 : Electric Motor and Transmission Disassembly

After motor and transmission disassembly, here the empty aluminium chassis for to start the assembly of the new tilting RC model vehicle.

Step 6: Step 6 : Steering Servos Disassembly

Picture of Step 6 : Steering Servos Disassembly

For to replace the new steering servos (3kg-cm torque) has been necessary to cut the servos place in two parts then installed a new servos with 9kg-cm torque for front tilting gears system used for to lean the model.

Step 7: Step 7 - New Servos Place

Picture of Step 7 - New Servos Place

From this place starting for new servos steering linkage and tilting system.

Step 8: Step 8 : New Steering/tilting System

Picture of Step 8 : New Steering/tilting System

Removing material from upper suspensions for to give place to shocks during the leaning phase; the shocks linkage made by a "meccano" bars. With arrow I can show the new servos lever that will work on gears tilting system.

Step 9: Step 9 : Design and Calculation

Picture of Step 9 : Design and Calculation

Starting with transmission ratio calculation for to get the same transmission ratio of original kit; then with rear drive toothed gear, toothed gear pitch and rear wheel drive axis position for to calculate the toothed belt diameter.

The toothed belt size due also to the particular rear shocks position, linked on upper support and on arms suspensions.

The shocks inclination due also for to get a right position of the arms (made in aluminium bars) and wheel on the floor.

Step 10: Step 10 : Rear Wheel Suspension

Picture of Step 10 : Rear Wheel Suspension

The rear drive wheel is connected to the axle shaft of original kit model by a new aluminium links suspension; to the axle shaft is connected a inner toothed gear and the toothedbelt transmission.

Step 11: Step 11 : New Aluminium Parts Cutting Edge

Picture of Step 11 : New Aluminium Parts Cutting Edge

For new aluminum parts cutting has been used a laser cut machine, the thickness is 2mm for all parts.

Step 12: Step 12 - New Rear Motor and Gears Transmission Support

Picture of Step 12 - New Rear Motor and Gears Transmission Support

For the motor support has been used an aluminium part linked on old kit chassis; here is linked also the original kit transmission gears.

Step 13: Step 13 - Front Tilting System

Picture of Step 13 - Front Tilting System

The front tilting system has a triangular aluminium part for the gears connect, the two gears are moved by servo lever and are linked to shocks "meccano" bar linking.

Step 14: Step 14 - Rear Assembly

Picture of Step 14 - Rear Assembly

By arrow is shown the metal shaftholder and its bearing, the shaft connect the final gear transmission and gear for toothed belt.

On upper motor support is linked the right shock while the arrow show the left shock linkage.

Step 15: Step 15 - Rear Suspension

Picture of Step 15 - Rear Suspension

Two arms link, by a 3mm screws bars, shocks and rear suspension support.

Step 16: Step 16 : Tilting Vehicle Model Assembly

Picture of Step 16 : Tilting Vehicle Model Assembly

Step 17: Step 17 : Finished Tilting Vehicle Model

Picture of Step 17 : Finished Tilting Vehicle Model

For the wheels may be used 1:5 RC bike wheels (diam. 125mm) for its better round profile.

Step 18: Step 18 - Body Shape Design

Picture of Step 18 - Body Shape Design

The body will make by a resin or ABS material.

Step 19: Tilting RC Model Vehicle Motion

Step 20: Tilting 1/10 RC Model Vehicle - Parts and Tools

Used parts :

1 servo type Hi Tec – 9kg/cm torque for the steering

2 plastic gears (60 teeth), for front tilting system

1 metal shaftholder, for the linear shaft that link original transmission to toothed pulley

1 ball bearing, keyed on linear shaft and metal shaftholder

1 toothed pulley (50 teeth), for belt transmission to rear drive toothed pulley from electric motor

1 linear shaft Ø6 mm, for to key the toothed pulley

1 second toothed pulley (40 teeth), for the rear drive wheel

1 second linear shaft Ø6 mm, for to key the second toothed pulley

1 second ball bearing with flange, keyed on the second linear shaft for toothed pulley and rear wheel drive link

1 set collar Ø6 mm for to stop the linear shaft

1 toothed belt, for transmission from electric motor, by metal gears (original kit), to rear drive toothed pulley

1 aluminum foil 2mm thick

1 aluminum foil 1mm thick

1 threated rod M3

Any “MECCANO” parts (bars, nuts, bolts M4) for to make the front tilting system

Tools :

Dremel tools

Laser cut machine for all aluminum new parts

Original Arrma Vortex kit used parts :

Front and rear shocks absorber

Electric motor (Mega Motor brushed, 540 15T)

Transmission, driveshafts excluded

3 Hubs

3 Arrma “ADX 10” dish wheel (Ø60mm)

3 Arrma dBoots “Multirib” tyre front (26 – 57mm)

Chassis, plastic linking excluded

Electronic parts

Step 21:

Picture of

This is the body shape made in resin material, the next step will be the body made in ABS or acetate, much lighter.

Comments

charliebike58 (author)2016-04-28

Thank you again to all those follow my project, in the next future I'll develope an electronic system of tilting control by Arduino and sensors for to test it as a true model. Meanwhile I'm searching for a RC model car company interested to the production of this particular RC model.

charliebike58 (author)2016-01-15

Many Thanks for all which follow my project that would be a future project for electric urban mobility. I designed also a real project/idea of this vehicle and I'm searching experts for electric/electronic servomechanism and sensors.

charliebike58 (author)2015-08-16

Hello
everyone,

I added new photos in step 21 relate the
body shape made in resin material, as soon as possible I will an acetate
version of the body, much lighter; however this (heavy) resin body was helpful
to test the dynamic and kinematics of the model especially when cornering.

I take this opportunity to thank all the
followers and favorited.

My target is to realize the
mass-production of this tested model and I'm searching someone, in the branch
of rc-modelling, who likes to make kits of this TRcMV.

charliebike58 (author)2015-01-19

Hello everyone,

I added new photos in step 18 - body shape design - regarding the 1/10 model of the body made of polystyrene with which I'll make a mold for the body of carbon fiber. The line of the body takes up to an old my idea (1999) of tilting vehicle that you can see on www.tiltingmodelvehicle.flazio.com

RCJosh (author)2014-11-16

instead of chopping up the servo box you couldve just disassembled it and put the different one in

charliebike58 (author)RCJosh2014-11-16

Of course, it should be as you say, but it was impossible to extract the servant, as if they had glued the top after installing the original servo, moreover the servo also the plug could not get out of the small circular hole back as if they had first entered the wires and then welded the pin same.

RCJosh (author)2014-11-13

looks interesting, ive been doing rc stuff for a while and have yet to see anything like this. what kind of performance does it have compared to the stock car? have you found any issues with the design yet? i see the front end modification almost acting like a very stiff sway bar, which makes me wonder if you couldve put a stiff sway bar onto it and made it do the same thing... however, you mentioned putting a larger tire on the rear, and unless you change the gearing, your motor and speed controller most likely will overheat and shut down.

good luck with future projects

Josh

charliebike58 (author)RCJosh2014-11-14

I can try to explain in order your question from my point of view.

I shortly answer below to your first question on your stiff sway bar
discussion explaining the difference between tilting vehicle and stock car
during a turn, so very shortly because would be more pages to explain the two
dynamics.

No again, I’ve not found any issue because I’ve finished few days ago
this model that I started in July with the design, disassembly and assembly,
but as I wrote on my intro, this model vehicle is a my old idea of 1/1 tilting
system vehicle started 15 years ago and where I designed a new tilting system
that looks like to this 1/10 RC model vehicle and formed by a toothed wheels
and toothed belt need to lean the front wheels; however I already introducing
this RC model idea to RC model cars companies.

I don’t understand very well your observation on the stiff sway bar or
anti-roll bar, if you mean it, as a 4 wheels vehicle during a turn, the
cornering force causes the chassis to roll toward the outside of the corner and
anti-roll bar with spring stiffness limit the leaning and keeps loading and
camber tyre in optimal range, so to explain shortly because there is also the chassis
stiffness that contributes to it.

In the tilting model vehicle you must achieve opposed effect or rather
toward inside the turn the weight of the vehicle, as a bike but by 3 wheels
with a resulting of a better road holding.

But, is my opinion that, the tilting vehicle concept could have many
arguments to its favour.

The last question : I assure that I tested and checked this RC model
many times and I don’t draw attention to overheat of the motor and speed
controller because I’ve kept the original transmission ratio.

Thank you Josh for your wish.

RCJosh (author)charliebike582014-11-14

whether or not youve kept the original transmission ratio, when you run a larger tire, it creates more strain on the motor and esc. and i see your points regarding the swaybar, and i am still thinking in the "4 wheels" area of rc.

josh

p.s. you couldve removed the servo by unscrewing the radio box. the original one got in there somehow, it can get out ;)

charliebike58 (author)RCJosh2014-11-15

Dear Josh,

certainly large tyres require more strain on the motor overall created by more friction but I would tell you that original kit (Arrma Vortex 1/10, read also the tecnichal motor dates on last step) equipped by 52mm (2"04) width and 108mm (4"25) diameter wheels, look also original kit on the first step; now this model is equipped by 26mm (1"04) width and 78mm (3"07) diameter wheels.

Relate your "4 wheels" area thinking is ok, is your point of view and I would say only that we are talking about two kind of concept vehicle, tilting car is near to bike concept (on turn) with some difference : third wheel support, 2 seats cover vehicle, energy saving etc. etc. however keep in mind that we are looking for a tilting RC MODEL vehicle.

Could you please mores specific on your P.S. Thank you Josh.

astrong0 (author)2014-11-14

Good lord this is impressive.

charliebike58 (author)astrong02014-11-15

Thank you sir.

The nerdling (author)2014-11-13

when the rear wheel goes up over a bump the belt would become loose and wear out, you should put a tensioner on it

Right remark, The nerdling; I already thought at this problem, initially
repairing by shocks hardening and this, I confirm you, minimizes the problem and
then by mounting of a tensioner that I would find in the market or MISUMI
catalogue where I’ve bought many components.

Thank you for your attention.

drkwhitedragon (author)2014-11-13

is it just me or it seemed like it lost some grip on the rear wheel?

To Drkwhitedragon

I don’t think, it
never happened at least during test, but as I wrote on my intro the round
profile of a 1/4 bike wheel model is better also for its bigger
diameter; I already explained the reason I’ve used this kind of wheels, I
wanted use as far as possible Arrma Vortex parts and also because the rear
wheel drive’s hub is not suitable to the hole of the bigger 1/4 bike wheel.

Is very important for me to emphasize that this RC model could be
developed again but this is the idea : to scale reducing my old idea of 1/1
tilting vehicle system design of 15 years ago.

Thank you.

docileroo (author)2014-11-13

Looks cool. Would you say that the turning radius is comparable/improved/or increased from the original car?

Can you provide some better photos or diagrams of what's going on with the front suspension? It's hard to tell where the steering rods are connected inside and how or if the servo is driving those and the front gear.

Thanks!

charliebike58 (author)docileroo2014-11-14

Dear docileroo

I answered to RCJosh
explaining the different dynamic of two kind of vehicle even for me is a new
way to concept a car or vehicle.

Relate your question
you can find the answer to RCJosh comments where I explain shortly the two
vehicle’s conditions, in the meantime even we are talking about a RC model,
further stability of this vehicle you add a bike feeling on turn and many other
qualities again.

But overall, further improved
performance, I would to divulge this concept of vehicle, remember us that it’s
a RC model.

Relate your question
on front suspension you can look the dynamic or movement both on the photos in step 13 and
on the starting video, however after your observation I’ll upload a new photo
with a drawing for to explain better it.

Relate steering rods
and servo connection you can look step 7 and 8; simply the steering rods are connected to the
original leverage kit system, I didn’t change anything, only I’ve added a rod
connected to original leverage steering system (moved by servo) and linked to
an aluminium bar, this bar is linked, by a Ø4mm bar screw, to
the front lower gear (blue color in the photo) for to move the “meccano” bar
that linked the shocks, however I’ll show all this on the new drawing.

Many thanks for your attention.

ibenkos (author)2014-11-13

So smart idea! Thanks for shearing :)

peacea1 (author)2014-11-12

i think it's better with more bigger rear tyre.

charliebike58 (author)peacea12014-11-13

Dear peacea1,

If you read my introduction on Tilting RC Model Vehicle I talk about:

"For the wheels I could use 1:5 RC bike wheels (Ø125mm) for its round profile but I should adapt the hubs to a bigger hole of these wheels, instead I’ve used Arrma Vortex hubs, wheels and tyres."

In fact the rear chassis wheel space is for a bigger diameter wheel, only I should adapt a new hubs to that kind of wheels, but all is possible, also to make steering rear wheel drive.

Thank you for your interest.

petercd (author)2014-11-11

Some serious hacking there. :)

Pretty cool first time instructable.

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