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The Most powerful Cox engine EVER
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The Most powerful Cox engine EVER
John Goddard Fri Apr 06, 2012 3:51 pm
Er
As you can see from the shot below after tinkering last night on the TshureDee, fine tuning and Loasda
NITRO it was producing a lot of power.
So much so It managed to tear itself to pieces 2 mins into the first flight of the day.
The crankshaft sheared flush with the crankcase with the loss of prop,driver etc.
Ah well back to the drawing board.....
As you can see from the shot below after tinkering last night on the TshureDee, fine tuning and Loasda
NITRO it was producing a lot of power.
So much so It managed to tear itself to pieces 2 mins into the first flight of the day.
The crankshaft sheared flush with the crankcase with the loss of prop,driver etc.
Ah well back to the drawing board.....
John Goddard- Diamond Member
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The Most powerfull Cox engine Ever
proctor Fri Apr 06, 2012 5:08 pm
Well ' Johnnie Boy' you are certainly making the mistakes so we don't
have to Wondered if you used a stud per Paul Gibault
to avoid cranks breaking? Apologies to Paul if I miss spelled his name. John
have to
Wondered if you used a stud per Paul Gibault to avoid cranks breaking? Apologies to Paul if I miss spelled his name. John
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Re: The Most powerful Cox engine EVER
Cribbs74 Fri Apr 06, 2012 5:49 pm
John Goddard wrote:Er
As you can see from the shot below after tinkering last night on the TshureDee, fine tuning and Loasda
NITRO it was producing a lot of power.
So much so It managed to tear itself to pieces 2 mins into the first flight of the day.
The crankshaft sheared flush with the crankcase with the loss of prop,driver etc.
Ah well back to the drawing board.....
Is there a KB crank in your future?
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Re: The Most powerful Cox engine EVER
RknRusty Fri Apr 06, 2012 10:29 pm
Yeah, I better get some longer screws before I bust one.
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Re: The Most powerful Cox engine EVER
John Goddard Sat Apr 07, 2012 7:03 am
Aha
Great tips as always Guys.
I was about to stick the top end on a new surestart
Bottom end and go flying I'll put that idea on hold.
I'm fairly sure the bolt (not stud) was in as far as
The crank was threaded but I'll check thaT later
Against the new one.
I have got a Bernie KB2 but I haven't been able to
Get her running reliably so haven't bothered
With it. Do I nick the crankshaft from that?
Finally to imagine the 3 seconds it ran sans la
Prop, think the fastest running Cox you've heard
Pumped full of Helium.
Great tips as always Guys.
I was about to stick the top end on a new surestart
Bottom end and go flying I'll put that idea on hold.
I'm fairly sure the bolt (not stud) was in as far as
The crank was threaded but I'll check thaT later
Against the new one.
I have got a Bernie KB2 but I haven't been able to
Get her running reliably so haven't bothered
With it. Do I nick the crankshaft from that?
Finally to imagine the 3 seconds it ran sans la
Prop, think the fastest running Cox you've heard
Pumped full of Helium.
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Cox forged pistons anyone?
John Goddard Fri Apr 13, 2012 1:47 pm
Ok now stripped it to find that as above when the crankshaft snapped giving the prop, screw and driver a
brief career of their own. The revs went through the roof I'd estimate well in excess of 30,000 RPM
the piston let go.
As Paul says in his Mouse racer sticky just putting a longer stud and spinner/nut instead of a screw would
probably have prevented this until the crank pin let go....
There is 6mm more threaded area in the crankshaft for a stud to bite into.
brief career of their own. The revs went through the roof I'd estimate well in excess of 30,000 RPM
the piston let go.
As Paul says in his Mouse racer sticky just putting a longer stud and spinner/nut instead of a screw would
probably have prevented this until the crank pin let go....
There is 6mm more threaded area in the crankshaft for a stud to bite into.
Last edited by John Goddard on Fri Apr 13, 2012 1:59 pm; edited 1 time in total
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And here's one I made earlier
John Goddard Fri Apr 13, 2012 1:57 pm
I'm cheating and have already bolted a New Bernie TD topend onto a new surestart bottom.
The more eagle eyed will see I purloined a longer stud and spinner nut from my PT19.
The reason for not going Killer Bee yet? I told ya I'm lazy.
The more eagle eyed will see I purloined a longer stud and spinner nut from my PT19.
The reason for not going Killer Bee yet? I told ya I'm lazy.
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Re: The Most powerful Cox engine EVER
Cribbs74 Fri Apr 13, 2012 2:02 pm
John Boy,
Total destruction! Ooooo! Wait maybe you could put a rod through the case!
Love the pics man! Good stuff. Have you modded the backplate?
Perhaps lose the choke tube......
Total destruction! Ooooo! Wait maybe you could put a rod through the case!
Love the pics man! Good stuff. Have you modded the backplate?
Perhaps lose the choke tube......
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Re: The Most powerful Cox engine EVER
John Goddard Fri Apr 13, 2012 2:17 pm
Thoughta bout it Ron but you know these sure starts are so named I guess cos they're very easy to start
even with all the gear up top and another thing I like is the ability to shut it down by sticking a finger over the tube.
even with all the gear up top and another thing I like is the ability to shut it down by sticking a finger over the tube.
Last edited by John Goddard on Fri Apr 13, 2012 2:20 pm; edited 1 time in total
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Re: The Most powerful Cox engine EVER
Cribbs74 Fri Apr 13, 2012 2:20 pm
John Goddard wrote:Thoughta bout it Ron but you know these sure starts are so named I guess cos they're very easy to start
even with all the gear up top and another thing I like is the ability to shut it down by stick a finger over the tube.
I suppose, I have one and I have not tried it to be honest. Once you bore the venturi out for flow it will be harder to start choke tube or not!
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forgot to mention
John Goddard Fri Apr 13, 2012 3:22 pm
It was running 60% nitro and the 6x4 was (don't laugh) happily around 22k
Everybody in da house say
Kaboom
Everybody in da house say
Kaboom
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OK you Rascal
John Goddard Fri Apr 13, 2012 3:41 pm
30% 5x3 and I think 20k cap tomorrow.
It's gotta survive for it's power pod twinnergyness next week.
And it's first ever RISE OFF GROUND TAKE OFFFFF YEEEEEEEEEAH
It's gotta survive for it's power pod twinnergyness next week.
And it's first ever RISE OFF GROUND TAKE OFFFFF YEEEEEEEEEAH
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Re: The Most powerful Cox engine EVER
nitroairplane Fri Apr 13, 2012 6:39 pm
lol you gotta give me a contact number for your fuel guy John!John Goddard wrote:It was running 60% nitro and the 6x4 was (don't laugh) happily around 22k
Everybody in da house say
Kaboom
I wanna try 60% in an 010
I got a spare crank lying around.
If the diesel won't break my hardened crank I think 60% would be fun, if not maybe in the norvel
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Has the South risen again
John Goddard Sat Apr 14, 2012 5:30 am
Speak to Dave he'll knock up whatever you want.
He doesn't do mail order tho you have to go down there.
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Re: The Most powerful Cox engine EVER
Cribbs74 Sat Apr 14, 2012 7:53 am
John Goddard wrote:
Speak to Dave he'll knock up whatever you want.
He doesn't do mail order tho you have to go down there.
Pure evil...... Your like a nitro "pusher"
You ought to spike your hair, rip your jeans and change your sig to Johnnie Rotten.
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