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Happy My First Air Cars

Post  Yabby Tue Dec 21, 2021 1:48 am

I just recently purchased a couple of cheap Radio controllers and receivers and wanted to teach my self about setting up servos, setting limits on channels, fail-safe modes and all the things that are  involved with RC as the basics. I also wanted to teach my brain that when something is going away from me, it steers one way and when its coming to me it steers the other way. Lol. Brain training, like flying inverted CL.

I bought the RC gear as my Lad really wanted to have a go at RC, although I love CL and prefer it to RC. But RC can do a lot lot more than just fly planes, and thats what got me excited about the idea. The other thing is the Cox 049 Surestart motor must be the most malleable, reliable, easy starting, constant running, and well sized engine there is available for powering things  I want to build and some I have in progress.

My First Air Cars Air_ca10

Anyway, I decided a pair of very simple, easy and quickly built air cars was the answer to learning some stuff. All they need is steering and throttle control. I used OS Carbys as they are quite cheap in Oz and I was able to buy them down the road from my local hobby store who had them in stock. I have several Cox ones on order and they should be here about 3 weeks.  The Surestarts have been very very carefully built for this application. It may sound counter intuitive but to make an engine run at low revs and do so consistently without the revs wobbling around, hunting and popping etc. is as hard as making one go fast. My two surestart engines will both hold around 4000 rpm and I haven't measured the peak. Probably 15 or 16.  I papered the cranks, squared the crank nose off, squared the back of the crank case off, squared the top of the crankcase off, used a metal reed very deliberately, squared the Cox plug adapter off, used permatex anaerobic sealant on both sides of the crankcase gasket and also on the threads of the cylinder, cox plug adapter head and standard glow plug threads. Used 5x3 prop, 25,25,50 fuel.

The cars go great!!! my son and I have quite a laugh with streamers on them dog-fighting like combat planes but air-cars instead.

Started building an RC dirt speedway sprint car with a Cox engine and am currently setting up the geared drive train for it.
A hovercraft with a Cox engine is sort of started
And my very favourite project which could take me 18 months is using a Cox Surestart to power the fuel pumps for the propellant and oxidizer for the projects actual engine. :-)
A mate of mine has ordered an RC grand prix road race sidecar model using a surestart with geared drive train and a servo controlled moving weight to replicate the weight distribution changes of the fella in the chair when cornering.

I love flying my Cox TD CL planes, but I also love making dumb stuff of prototype/concept demonstrator quality and the Cox Surestart engines are just perfect for this. Old Bugger cheers Thumbs Up

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Happy Re: My First Air Cars

Post  balogh Tue Dec 21, 2021 7:47 am

Congrats Yabby,


your RC car project is very spectacular, I like your DIY solution regarding the steering of the front wheel.

What is the type or serial number of the OS RC carbs you are using on the Surestarts? If not from Oz, then maybe from ebay, I could buy one. I have COX and Tarno carbs for my TeeDees, but they do not attach to the snorkel of the horseshoe backplates.

I wish I could also lure my son into the hobby and do my RC plane building projects together with him, but he is obsessed with IT, which is actually his job, and is not willing to stray away for mechanics.
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Post  rsv1cox Tue Dec 21, 2021 9:01 am

I have lots of admiration for your project Yabby, you could have taken the easy way out and used electric motors, but what fun is that. Brain training, I know what you mean. Thinking opposite has never been easy for me. R/C airplane coming right towards you - which way............right/left...Oh No! Takes practice but you get there.

My son has a R/C flight simulator like this -

My First Air Cars Rc_fli10

Multiple planes to choose from and lots of fun. But no substitute for the real thing.
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Post  davidll1984 Tue Dec 21, 2021 9:56 am

Never forget that your nose is always in the same place relative to your face imagine you first the nose of the plane is your face which is in the air Once you've made that connection in your brain It's easier over time becomes second nature Small Cox Logo Babe Bee .049 RC Plane
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Post  Marleysky Tue Dec 21, 2021 5:22 pm

Yabby Dabby DO! A few years of modifications beyond the Flintstone Mobile. Very nice, power steering, throttle and Airpower. Looks like they should be lots of fun. Great job!
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Post  Yabby Tue Dec 21, 2021 6:12 pm

thanks for the positive feedback everyone! :-) yes, we are certainly having a great time driving them. sunny cheers

balogh wrote:
What is the type or serial number of the OS RC carbs you are using on the Surestarts? If not from Oz, then maybe from ebay, I could buy one. I have COX and Tarno carbs for my TeeDees, but they do not attach to the snorkel of the horseshoe backplates.
Balogh the carbys I used are OS carbys and work well. They are different as I couldnt get two the same in Oz at my local hobby shop.

Im sure you will find them on the net quite easily. Many of the .au RC websites advertise them but are often out of stock. But Im sure you will find them on Ebay otherwise you could search Australia RC hobby supplies partnumber......  And you might find some and be able to get them shipped.

They are.
SKU OSM24081000
OS Engines Carburettor Complete (40d) 40-46la
SKU OSM21783000
OS Engines Carburetor 10G, 15LA

main difference is price between the two and bore size, internal and external. Otherwise the same as far as I can tell. :-)
Both work very well and easily were adapted to the Surestart horseshoe backplate. They do more than I need, but they work and I could get them. I know that Bernie sells a Carby that mounts on the Grey horseshoe backplate and Matt might sell them also. Ive ordered two from Bernie to give them a go also.

Electric may seem easier but given I dont gravitate to electric by nature, I would find building one that way to be a chore. I understand all the electronics etc. but 35+ years working on Gov defence research projects has done me in with some stuff. Lol. I could do it electric, but no fun. I currently work in the hypersonic / scramjet research field and these models I build are not work, they are pure relaxation and fun and laughs. As I said before I love the simplicity of quickly put together concept demonstrator/prototype quality models of all sorts I can build using Cox engines!

I looked at the price of a sim for my controller and near had a bloody cardiac arrest! Lol. over $200 Oz. I can crash a lot of cheap yabby type planes for that much. :-) anyway RC planes are not my focus. Sprintcar, racing sidecar, boats, hovercraft, better cars with proper drive chains, and CL for my planes. :-)



Yabby


Last edited by Yabby on Tue Dec 21, 2021 11:19 pm; edited 1 time in total (Reason for editing : Placed quote and re-arranged to ensure Balogh/Andras would see the carby answer)
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Post  NEW222 Tue Dec 21, 2021 8:28 pm

Awesome job on teh cars. Also great to see you are having fun with them. I am also in process of retrofitting my Air Car Trainer to 2.4 GHz. They are a blast for sure, and I like it also for training to 'fly' towards yourself. If you want something bigger and cheap, take a look at mine. Also very easy to build, but I personally like the look of yours better!
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Post  NEW222 Tue Dec 21, 2021 8:31 pm

Also, it is slightly bigger and uses a .40 airplane engine.

My First Air Cars 20180111
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Post  Yabby Tue Dec 21, 2021 9:15 pm

thanks new222, Man, would yours go with a .40!!! cheers Im fairly happy with the speed we are getting and I only own Cox 049 engines. It keeps things simple for me. lol! Since first posting the picture of the cars I have added a roll bar to protect the engine and mainly the carby. They tend to go upside down now and then when we are having too much fun with them. Lol.

I might have to start naming my different types of models after Flintstones characters for Marleysky. lol! lol!

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Post  NEW222 Tue Dec 21, 2021 10:28 pm

I am either missing it or I am blind. But what material are you using for your 'chassis' / base plate of your cars, and front steering axle?

Sorry for suggesting the bigger .40 size version as I had thought you robbed the carburetors off of a couple of engines, but took my time to carefully read and see that you just purchased the carburetors.
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Post  Yabby Tue Dec 21, 2021 11:12 pm

Hey nerw222 nothing to be sorry about cheers ALL suggestions and ideas and thoughts are good ones! Thumbs Up I dont make nice beautiful perfection models. I just havent got the skills or patience. I just like trying out ideas quick and easy.

I do like the idea of more power, but a very lot more. Power that can only be produced when propellant and oxidizer under high pressure meet and are ignited!!!! Lol. Side project Lol.

The cars baseplate is plywood. three ply and is almost 3mm probably 2.5mm thick by my old ruler. :-) Im at our shack and my vernier is at home. All of the car is made from the same ply. painted with two coats of rustoleum. all glued together with cheap $3 tubes of epoxy. The front steering is made from the same plywood, but underneath it are two pieces of music wire/spring steel going from end to end of the arm. Gives it strength and a bit of spring. Just super glued those wires on as I didnt want it rigid from epoxy. under the cars is a lump of cast iron that is about 5/16 thick, 3 1/2 inches long and 2 inches wide to give the car more weight and make it stable. the bits of cast iron are from some trailer suspension axle plates that the big U bolts went through that I managed to break in half. Lol. (long story). I dont think the picture I posted shows all the rubber band holes and rubber bands going wide across the body to hold the cast iron in place under the car. Improves the handling and throttle response etc. hugely as the cars are just soo light.

The collets that hold the wheels on are from an electrical connector strip at the hardware store that has a strip of about 24 duel screw connectors all wrapped in plastic. $4 Ozzy. I cut it up and cut the connectors in half and got a set of really good collets really cheap. Cut up bits of fuel tubing are the wheel spacers with some washers even! Lol. ( bit fancy) rubber bands hold it all together otherwise and the one with rear brakes has sandpaper on the plywood that goes back against the wheels to stop it. Tyres are 42mm aero modeling pneumatic tyres, that are wearing out quite quickly. Im going to supoer glue some rubber bands around the outside of them to get cheapo life out of the wheels as they cost way too much in Oz.

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Post  NEW222 Tue Dec 21, 2021 11:26 pm

Thank you for the detailed build summary. Definitely sounds like a lot of planning, thought, and time went into them. But on the bright side,they worked out well for you.
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