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Construction & Finishing / Re: Motor mount rebuild
« Last Post by Mike Wood on Yesterday at 10:29:45 PM »
It was just a thought and some older technologies have this built in  :)

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Construction & Finishing / Re: Motor mount rebuild
« Last Post by Malcolm Harris on Yesterday at 10:26:01 PM »
OK I lied!


It would be possible to fit sensors in the motor to measure the position of the rotor and then use these to stop the motor in the correct position. In fact Hacker have such a system to enable them to accurately commutate the motor at low speed to provide a constant prop idle speed during braking rather than just applying a braking torque to the motor shaft. You would also need some fancy software but it would be doable.


But why bother? You could also fit folding blades.........


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Construction & Finishing / Re: Motor mount rebuild
« Last Post by Mike Wood on Yesterday at 10:09:13 PM »
Now there's a challenge!

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Construction & Finishing / Re: Motor mount rebuild
« Last Post by Malcolm Harris on Yesterday at 08:11:16 PM »
No!


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Construction & Finishing / Re: Motor mount rebuild
« Last Post by Mike Wood on Yesterday at 07:17:41 PM »
I wonder if it's possible to have an Esc that could stop the prop(s) level?

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For Sale and Wanted / ZN Line Enigma £100
« Last Post by STEVE BARNARD on Yesterday at 04:39:19 PM »
2 meter ZN Line Enigma pattern ship for sale

Fitted with a mixture of digital servos and a YS170 set up.

Will sell complete for £250 or airframe only with servos etc for £100

Unable to load pictures, tatty model, email steveb@womoco.co.uk for pictures.

Model is in Woodford Green, Essex call Steve Barnard 07483 414201


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For Sale and Wanted / Vintage Pattern Ship £100
« Last Post by STEVE BARNARD on Yesterday at 04:34:57 PM »
73 inch wingspan vintage pattern ship for sale

Fitted with Standard Futaba servos and a YS140 set up.

Will sell complete for £250 or airframe only with servos etc for £100

Unable to load pictures, tidy model, email steveb@womoco.co.uk for pictures.

Model is in Woodford Green, Essex call Steve Barnard 07483 414201


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Construction & Finishing / Re: Motor mount rebuild
« Last Post by Stuart Mellor on Yesterday at 04:34:18 PM »

Hi, Just a comment on Malcolm’s post re using carbon cloth. In my experience ‘Ordinary’ glass cloth will do equally well for reinforcement/bonding. I use twill weave cloth which is more flexible (before bonding) and conforms much better to compound curves.


Trouble is modellers today like the ‘bling’ effect of carbon and because of its use in hi-tech industries, believe it’s the only stuff for us! For our uses, ordinary glass cloth is just as good and looks far better inside a fus. Carbon is sometimes difficult to use & can look awful if not properly applied. Ordinary cloth, on the other hand will blend in & be almost invisible and just as strong.


Another point I agree with is the point about carbon versus epoxy glass sheet for front mounts. Some carbon sheet is made from pre peg material & not a wet layup. I’ve had carbon sheet where the layers can be split open easily due to improper bonding. Much prefer wet lay up epoxy sheet. Not got the bling – but if it’s hidden, so what. Can recommend Mcgregor (JR) 3mm epoxy sheet for mounts – super stuff & will not break.......

Regarding the rear ‘tabs’- I’ve seen installations where they have been simply epoxied in place – just asking for trouble. From my own testing – I know that glass fuselages twist a lot under torque. I’ve seen about 15mm rotational twist under full power. Frightening! This is probably the root cause of failure of rear mountings – because the fus sides are in effect part of the engine mount & the twisting is trying to de-bond the rear mount. Perhaps some 25mm reinforcement glass strips along the fus sides might help join the front & rear mounts.



As Malcolm says – make a good job of reinforcing the rear mount.
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Construction & Finishing / Re: Motor mount rebuild
« Last Post by Keith Jackson on Yesterday at 09:20:48 AM »
Nothing really to add to Malcolm's posts. However when you hear the words "prop strike", alarm bells start going off.  At the world cup event last weekend Arthur S had a minor prop strike and then went on to have his motor rip itself out of his Citrin whilst flying due to a thrown prop, resulting in massive imbalance and consequent structural failure of the mounts / fuselage.

I also had a minor prop strike in the windy conditions and didn't think anything of it until I got home (several flights later) and noticed the rear prop had cracked across the root of the blade, inside the spinner cone, so was not obvious. If I hadn't have checked, this certainly would have failed resulting in serious damage and more importantly serious risk to life.

Keith
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Construction & Finishing / Re: Motor mount rebuild
« Last Post by Alan Williams on Yesterday at 07:41:59 AM »
Malcombe,
Just to make you feel a little easier, it was not the auysler that suffered the problem, he also had a bj inspire and it was that model that suffered the problem.
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