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Home✈️Aircraft🚁HelicopterThunder TigerOther › Jesus bolt & one Very lucky me!!
01-15-2006 09:07 PM  13 years ago
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Mattiward

rrApprentice

160ft off the deck 10ft from 400,000 volts - U.K.

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Jesus bolt & one Very lucky me!!
I'm running my Rappy 50 in, with the 5th tank through it this afternoon. I'm flying big gentle circuits to break it in gently in idle up 1 and get used to all the extra power too!!

tt39 / 10% --> now im Hyper & 30% Curtis formula!!

Anyway just as I was landing at the end of the day there was a loud clatter and I immediatly shut it down. Went to pick it up and the main shaft lifted...

Can only be one thing - The Jesus bolt on the white auto hub had gone AWOL. On departure it scored some grooves round the clutch bell, but apart from that, I think i've got away with it!!

PHEW!!

Should I go high tensile or what?? It is quite a concern, as i've only had a few lazy flights with soft landings and this happens.

Cheers Matt.
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01-15-2006 09:32 PM  13 years ago
raptor.heli

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Westyorkshire uk

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same thing happened to me but i had refueled and was going again and i throttled up but did not sound right when out and picked up heli and main shaft lifted up


simon
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01-15-2006 09:55 PM  13 years ago
wuzofoz

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Brisbane,Queensland- Australia

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the problem with sandard bolt seems to be it's to short.
well mine was anyway.
high tensile is not a good idea as they have a low shear strength.
a mild temperd bolt would be the better option.
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01-16-2006 12:23 AM  13 years ago
HelicopterJohn

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Seffner, Florida (Just East of Tampa, Florida)

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Broken Jesus Bolt
Mattiward,

Welcome to the Broken Jesus Bolt Club. You were lucky with no damage to your helicopter or other spectators. I had one break just at takeoff and the whole rotor head left the helicopter destroying the canopy and electronics as the blades chopped the helicopter to pieces. Lucky no one was hit with flying debris.

I got tired of that nonsense and modified all my machines to 4mm Jesus Bolts and no problems since the conversion a couple of years ago. I have (2) V1's and (1) V2 and have converted all of them.

Check my gallery to see what I did to fix this issue.

These bolts were breaking on the V1's and this is just another one on the V2's. At least that is what I got from your post talking about the white gear.

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery
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01-16-2006 01:41 AM  13 years ago
chuckhager

rrKey Veteran

Clovis, CA

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I've been using some bolts from McMasterCarr cut down to length, but the 4mm conversion sounds like a better idea to me. Does anyone know if someone makes a simple bolt in conversion kit.
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01-16-2006 01:50 AM  13 years ago
Doug

rrElite Veteran

Port Saint Luice Florida....

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That's more common than failing during flight.. what happens is the nut end threads fail. In flight the load keeps the bolt in place. lessen the load (auto) and the it flings the bolt out. I went to 4 MM myself. First member of Member of Bearings Anonymous
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01-16-2006 02:09 AM  13 years ago
HelicopterJohn

rrKey Veteran

Seffner, Florida (Just East of Tampa, Florida)

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4MM conversion
To do the 4mm conversion you have to drill the mainshaft to 4mm I replaced both the top and bottom Jesus bolts with the 4mm size.

This means you have to make some spares (4mm predrilled mainshafts) and keep them handy in case of a mishap.

The hardest issue is drilling the hardened sleeve that the tail rotor drive hub rides on and the lower jesus bolt goes through. I used a 5/32 cobalt drill bit with plenty of coolant while drilling. After the drilling process I touched up the edges of the drilled hole with a fine stone in my dremel tool.

I also modified the upper head block slightly to allow for the 4mm jesus bolt to rest squarely on the head block.

I (had) detailed pictures in my gallery. For some reason my script is totally messed up and the verbiage is there but no pictures. I don't know if it is a result of the new software Mark just installed or something else. Too bad as it gave some nice detailed pictures of the conversion.

I don't know of anyone providing conversion kits. It is kind of one of those do it yourself kind of things at this time.

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery
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01-16-2006 06:26 AM  13 years ago
chuckhager

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Clovis, CA

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Thanks HelicopterJohn. And it looks like your pics are back.
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01-16-2006 09:53 AM  13 years ago
HelicopterJohn

rrKey Veteran

Seffner, Florida (Just East of Tampa, Florida)

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Gallery
chuckhager,

Yes, I now have my gallery fixed. I left a PM for Mark telling him what happened and he indicated to me there was a little bug in the RR V2 conversion and he rebuilt my Gallery as it was. Thanks Mark!!!

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery
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01-16-2006 12:57 PM  13 years ago
Peefor

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Norfolk UK

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Hi John

Can you let me into the secret. My gallery got scrambled too. I wrote to Mark, BUT mine is still the same.

Pete
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01-16-2006 07:23 PM  13 years ago
HelicopterJohn

rrKey Veteran

Seffner, Florida (Just East of Tampa, Florida)

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Scramble
Hi Peter,

I looked at your gallery and the script. It seems that all the pictures are there now and I didn't see any text in the current script.

Did you lose your text scripting?

If all the galleries got scrambled Mark is a pretty busy fellow fixing them all. It may take him a little time to get them back where they were. I have a rather large gallery with text and pictures so I am sure he had a time with that one. Well, I guess it could have been just a cut and paste from his old backup files.

If you did lose your text scripting you can open my gallery and click on the scripting icon on the top header row and it will display the script below all the pictures. If you look at the gallery and then the script you will see how I made it happen. Also, you could do a select all and do a copy and paste it into a word processor so you could print it out for reference.

Just send me an e-mail if these suggestions don't work as I don't want to get off the topic at hand.

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery
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01-17-2006 09:15 PM  13 years ago
Mattiward

rrApprentice

160ft off the deck 10ft from 400,000 volts - U.K.

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Well I don't think the 4mm option is really do-able as i've not got the precise tools required. Oh and I don't fancy drilling my metal head either.

So i've bought some longer replacement bolts with longer shanks as well, with the idea of removing any excess threaded shaft. I've cut one down, so there is about 3-4mm protruding once the nylock is fastened.

The questions I am now asking are:-

How tight should I secure the Jesus bolt & nylock nut?

Should I put a second nylock on behind the first one?
OR
Should I apply thread lock on the excess of shaft?
OR
Even cut into the excess shaft and prise the ends open to stop the nylock attempting to unwind?

Any quick replies would be greatly appreciated as i've got this week off work and i'm bursting to get airborne.

Regards

Matt


Full size helis are flying cooling fans -
turn the big fan off & watch the Pilot sweat...
Then it all goes quiet & the cows get bigger!!!
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01-17-2006 09:47 PM  13 years ago
chuckhager

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Clovis, CA

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No loctite. No CA. Use only one nyloc. Snug it up good, but not too tight. Too tight is half the problem. The other half is TT should have made this a 4mm solution.

Chuck Hager
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01-17-2006 10:03 PM  13 years ago
Mattiward

rrApprentice

160ft off the deck 10ft from 400,000 volts - U.K.

MyPosts All Forum Topic
Thanks for that.

I'll leave it as it is. Snug as a bug

Regards

Matt

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