RE: Extreme Flight 110" 100cc Yak 54 Build!  
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All Forums >> RC Airplanes >> Giant Scale Aircraft - 3D & Aerobatic >> RE: Extreme Flight 110" 100cc Yak 54 Build!
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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/23/2008 4:00:49 AM   
JoeAirPort



Posts: 7315
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: offline 		I'm gonna guess that there was a slight side load on the prop bolts. This can happen if the bolt holes are not opened enough so the prop just slides up and down the bolts when the bolts are barely in. This is what I do to make sure there is zero side load on the bolts. This can cause them to break bolts. Loose bolts can cause that too.

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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/23/2008 4:02:35 AM   
Josey Wales



Posts: 4699
Joined: 7/27/2003
From: **, NJ, USA
Status: offline 		What do you guys torque your bolts to ?

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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/23/2008 2:14:21 PM   
Rush7



Posts: 755
Joined: 11/8/2004
From: Chattanooga, TN, USA
Status: offline 		Joe I am pretty sure that there was no side load on the prop bolts. I had been running this prop and engine combo on my Panzl before I put it on the Yak. The prop and engine combo had over 50 flights on it. My props are always drilled a size larger than needed just to keep this from happening.

Maybe DA will shed some light on my problem.

quote:

ORIGINAL: JoeAirPort

I'm gonna guess that there was a slight side load on the prop bolts. This can happen if the bolt holes are not opened enough so the prop just slides up and down the bolts when the bolts are barely in. This is what I do to make sure there is zero side load on the bolts. This can cause them to break bolts. Loose bolts can cause that too.



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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 3:00:37 AM   
diamondave



Posts: 1753
Joined: 9/2/2004
From: marana, AZ, USA
Status: offline 		does da use a center bolt too? just curious cause i run zdz, both my 80 and 60 have the 6 outerbolts and one big center shaft with a nut on it, like a glow motor would have, a buddy at the field was suprised even the 60 does, he said thats overkill, but it may keep things like that from happening, dont know

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       Post #: 579

RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 3:32:24 AM   
xtraflyr


 

Posts: 1647
Joined: 3/10/2002
From: Chester, NJ, USA
Status: offline
quote:

ORIGINAL: diamondave

does da use a center bolt too? just curious cause i run zdz, both my 80 and 60 have the 6 outerbolts and one big center shaft with a nut on it, like a glow motor would have, a buddy at the field was suprised even the 60 does, he said thats overkill, but it may keep things like that from happening, dont know

Nope just the 5 bolts. It only happened to me once in the couple years I owned it.. Thats a good idea though that ZDZ has..


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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 1:40:07 PM   
Rush7



Posts: 755
Joined: 11/8/2004
From: Chattanooga, TN, USA
Status: offline 		The DA 50 has 4 prop bolts and the DA 100 has 6 prop bolts.
quote:

ORIGINAL: xtraflyr


quote:

ORIGINAL: diamondave

does da use a center bolt too? just curious cause i run zdz, both my 80 and 60 have the 6 outerbolts and one big center shaft with a nut on it, like a glow motor would have, a buddy at the field was suprised even the 60 does, he said thats overkill, but it may keep things like that from happening, dont know

Nope just the 5 bolts. It only happened to me once in the couple years I owned it.. Thats a good idea though that ZDZ has..



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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 2:04:19 PM   
torqmeister



Posts: 502
Joined: 2/29/2004
From: henderson, TX, USA
Status: offline
quote:

ORIGINAL: Josey Wales

What do you guys torque your bolts to ?

Joe, have you maidened yours yet? We need some pictures & a flight report.
I am also interested in the amount of torque to use on prop bolts.
Thanks

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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 2:12:58 PM   
Josey Wales



Posts: 4699
Joined: 7/27/2003
From: **, NJ, USA
Status: offline 		Hopefully tomorrow. I tached the motor at 6500 and backed it down to just under 6400 for break-in. Weight is just under 28 lbs.
I have my bolts at 55 inch pounds right now and they seem pretty tight.

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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 4:11:57 PM   
torqmeister



Posts: 502
Joined: 2/29/2004
From: henderson, TX, USA
Status: offline 		Good luck on the maiden.

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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 7:09:02 PM   
JoeAirPort



Posts: 7315
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: offline
quote:

ORIGINAL: Rush7

Joe I am pretty sure that there was no side load on the prop bolts. I had been running this prop and engine combo on my Panzl before I put it on the Yak. The prop and engine combo had over 50 flights on it. My props are always drilled a size larger than needed just to keep this from happening.

Maybe DA will shed some light on my problem.

quote:

ORIGINAL: JoeAirPort

I'm gonna guess that there was a slight side load on the prop bolts. This can happen if the bolt holes are not opened enough so the prop just slides up and down the bolts when the bolts are barely in. This is what I do to make sure there is zero side load on the bolts. This can cause them to break bolts. Loose bolts can cause that too.




Well looks like you had it covered then. Maybe they break when they loosen up...I better keep an eye on mine.

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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 9:28:14 PM   
xtraflyr


 

Posts: 1647
Joined: 3/10/2002
From: Chester, NJ, USA
Status: offline
quote:

ORIGINAL: Rush7

The DA 50 has 4 prop bolts and the DA 100 has 6 prop bolts.
quote:

ORIGINAL: xtraflyr


quote:

ORIGINAL: diamondave

does da use a center bolt too? just curious cause i run zdz, both my 80 and 60 have the 6 outerbolts and one big center shaft with a nut on it, like a glow motor would have, a buddy at the field was suprised even the 60 does, he said thats overkill, but it may keep things like that from happening, dont know

Nope just the 5 bolts. It only happened to me once in the couple years I owned it.. Thats a good idea though that ZDZ has..



oops! Yup 4 bolts,I knew my math stunk!!


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RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 9:53:10 PM   
diamondave



Posts: 1753
Joined: 9/2/2004
From: marana, AZ, USA
Status: offline 		well at least its not a common thing then, i plan on a zdz 100 or 120 for this plane when i hit the lottery , i like them, im guesing it will be like my 60 and 80, just a bigger pattern, the 60 and 80 are identical in the 6 bolts and center shaft, maybe thats why my 88" yak weighs more than most, haha

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       Post #: 587

RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/24/2008 10:54:59 PM   
yarom



Posts: 1186
Joined: 6/23/2005
From: Bellevue, WA, USA
Status: offline
I had the exact same thing happen to me on my 35% a month ago.

On the second engine run, after I tightened the bolts, I was doing the radio check when the engine shook off the nice CF prop, sheared the bolts (all of them still in) and made a mess.

Sent it to Arizona and they said that they needed to replace the entire crank shaft and prop hub - cost me $200.

They said they believed the bolts were bottomed out and therefore not tight. They also said to always use a spinner plate, even when not using a spinner. I was kind of surprised, since I verified them and they were tight.

So much for the great DA service...

quote:

ORIGINAL: Rush7

I maidened mine today. Here is the good.....Plane is in one peice. Here is the bad the DA-100 shreaded the prop bolts and slung the Menz 27x10 to somewhere between here and China. I am just glad it didn't let go when I was playing down low.

I am not sure what happened as the bolts are broke off and are still in the prop hub. Anyways the DA will be on its way to Arizona tomorrow to get checked out and make sure nothing internal got damaged.
The ES Composite pipes sound good and the plane flies awesome. I basically got one 15 minute flight and had to pack it in.

Any who ....... Here are a couple pics. Sorry for the poor quality as I had my buddies camera setup wrong.


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       Post #: 588

RE: Extreme Flight 110" 100cc Yak 54 Build! - 6/25/2008 12:27:47 AM   
xtraflyr


 

Posts: 1647
Joined: 3/10/2002
From: Chester, NJ, USA
Status: offline
quote:

ORIGINAL: yarom


I had the exact same thing happen to me on my 35% a month ago.

On the second engine run, after I tightened the bolts, I was doing the radio check when the engine shook off the nice CF prop, sheared the bolts (all of them still in) and made a mess.

Sent it to Arizona and they said that they needed to replace the entire crank shaft and prop hub - cost me $200.

They said they believed the bolts were bottomed out and therefore not tight. They also said to always use a spinner plate, even when not using a spinner. I was kind of surprised, since I verified them and they were tight.

So much for the great DA service...

quote:

ORIGINAL: Rush7

I maidened mine today. Here is the good.....Plane is in one peice. Here is the bad the DA-100 shreaded the prop bolts and slung the Menz 27x10 to somewhere between here and China. I am just glad it didn't let go when I was playing down low.

I am not sure what happened as the bolts are broke off and are still in the prop hub. Anyways the DA will be on its way to Arizona tomorrow to get checked out and make sure nothing internal got damaged.
The ES Composite pipes sound good and the plane flies awesome. I basically got one 15 minute flight and had to pack it in.

Any who ....... Here are a couple pics. Sorry for the poor quality as I had my buddies camera setup wrong.



Thats weird. I have nothing but great service from them. They are very cheap in the labor dept.They replaced my bearings and a few gaskets only cost 54 bucks,parts and labor.. I was also running a Menz on my da50 when it happened..


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