rc model petrol engine with electric start

[richard armstrong]

the future has arrived - LOL

i know certain e starters have been around for a while and that u can add on to engines, with the advancment of high powered brushlees motors the dream of e-starter is getting there?

but i found this

http://www.sdshobby.com/eme55ii-gasolin ... 11463.html

i hope one day that some one will invent/design an intergrated start for all petrol engines over 26cc this would be a lot safer than standing in front of the prop or having your fingers chopped off

post your thoughts ideas and design,

ric

[Barrie King]

Hi Richard,
It looks a really neat design but I notice it uses a Brushed motor not Brushless, any ideas why?

Barrie

[richard armstrong]

high torque and hard to burn out

[richard armstrong]

Hi Richard,
It looks a really neat design but I notice it uses a Brushed motor not Brushless, any ideas why?

Barrie

done as cheaply as possible no thought

[Barrie King]

Somewhere I have a couple of brushed motors and a spare engine or two, might have a go at making one.
I notice you are in Newark Richard, where do you fly? I am just up the road in Retford.

Barrie

[richard armstrong]

newark showground when i can but i have a private field i fly out of but looking for somewhere to join who can train me to fly large scale aircraft on a buddy systems

[richard armstrong]

Somewhere I have a couple of brushed motors and a spare engine or two, might have a go at making one.

Barrie

le me know if you do manage to make one i would be interested in purcahse

all u have to is get the starer module in bulk, from rcxel

[barrie burton]

Look on the Ladbrooke models web site.He is in the LMA as well.

[Alan King]

I built my system over two years ago, it is really easy to do but use a motor with a planetary gearbox, the gearbox should be about 1:5 and then the gear on engine as close to 1:5 as you can again.

on a 50cc petrol a brushed cheap 600 can turns the engine easily, the secret is to have a decent bendix, most systems I have seen use a one way bearing on the main spur gear on the engine, I think now some use a small bendix, my bendix used a 10x6one way bearing in the drive gear fitted to a 6mm shaft and engaged using a servo which drives the gear with a selector fork ala those found in gearboxes etc.

the problem with the bearing system is loss of a bit of power and danger of the bearing locking up/overheating. I am right at the moment developing an inertia style bendix without a spring to return and also does not need to rely on the inertia of motor to spin out, it will use a similar system to wind the gear out as those found on full size radial engine starters ie an oil seal for drag and as per inertia a twisted grooved shaft ( in this case an appropriate drill bit ) guys we have the parts to do this in most of our scrap boxes the first unit I built cost me a bit of lathe work only but then I even made my own gearbox.

I will be sending my pics to Dave Parry to use for an article if he wants to, my video of this on my Christen Eagle is on Youtube this was a 540 can fitted to a 30cc glow engine bit of trial and error from first system to the one you see in the clip, the unit all up with battery weighed about 500g
http://www.youtube.com/watch?v=QrIfNCg2o1E and this close up shows the bendix http://www.youtube.com/watch?v=vhk69CNr0Qs

these easily turn a big petrol, built one for a mate and yes you can use a brushless but dial in soft start.

[Alan King]

sorry just a bit of clarity the bearing in the bendix helps the gears to mesh as you face the gear to roll in the free wheel direction when it engages, you also need it for when the engine fires or the starter can lock in, then you have a generator at the least or a big big problem.

these are not the only ways to do it just the best I have found

[roy palin]

Ray Slack built electric starters for Z62's 15 to 20 years ago, one of the Liverpool club Wellingtons had them fitted, he was well ahead of the times, We all miss you Ray

[Alan King]

I certainly remmember Rays name if I am not mistaken even in darkest Africa we had heard of quite a few of the pioneers of RC, I also remmember Dr Jeremy Shaw having a starter on his Grumman Albatross but seem to recall this was only on one engine.

Yes I also read about his planes over there, I think what has happened is that we expect more and more from our hobbies and we want instant gratification hence ARTF's etc, of course they have helped many learn to fly but sadly not learn to build.

I for one have always been keen on an onboard starter and have seen the feasiblity of this, I built a system in the 80's at college but although small i would not have tried to use it in a plane, the secret now are our lipo batteries which allow for lighter batt weight.

I also built a radial which should never have run but it did after a fashion, it was a 9 cylinder two stroke and had no real chance of success but was a project also while at college.

I think sadly much has gone before which we now think we have discovered, i know starters have been around for ages though just think refinements can be made, it has taken me three years to come up with a simple bendix.

so what we have now are powerfull cheapish engines with onboard starters and ARTF aircraft which are huge and under 20kg we can fit auto pilots, brakes, retracts, and all the bells and whistles and just buy them off the shelf, we then prang these creation and have no idea where to start to repair them, sad is it not that the leading country in technology now is the leading purchaser of off the shelf products, yes they have there place but is it not better to learn to build our own. should our competitions not reflect this.

[Stuart Bishop]

Heres one you can get them for the 55 to
http://www.youtube.com/watch?feature=pl ... pqmK_YQm-Q

http://www.innovationmodels.co.uk/