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jeynon2
Joined: 25 Oct 2007
Posts: 24
Location: Southern Illinois
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 Posted: Tue Jul 29, 2008 7:36 am Post subject: Prop bolts |
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After the great response I received on the prop hub question, I thought I would try again with the prop itself. I'm using a wood Sensenich wood prop. To bolt the prop to the hub the Jabiru manual calls for AN4-46A bolts with Belleville washers and nylock nuts. The Sensenich installation manual calls for safety wiring the bolts.
So, here are my questions.
I don't seem to find Belleville washers at the online aircraft supply stores. Are they called something else?
Should I get bolts with pre-drilled heads and safety wire them?
I would think there is no point to drilling and wiring the nuts, as they could not be re-torqued without replacing everything.
Is there anything else I should keep in mind?
Thanks in advance.
John Eynon
Lightning kit #53
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Wayne Lenox
Joined: 07 Jan 2008
Posts: 75
Location: Arizona in the winter
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| Posted: Tue Jul 29, 2008 12:21 pm Post subject: Prop bolts |
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Jeynon
Just finished with my Lightning. I think we used AN5 bolts. washers and Nylock nuts. I did re- torque after 15 hrs. to 17 1/2 ft lbs.
Wayne
-- "jeynon" <jeynon2(at)verizon.net> wrote:
--> Lightning-List message posted by: "jeynon" <jeynon2(at)verizon.net>
After the great response I received on the prop hub question, I thought I would try again with the prop itself. I'm using a wood Sensenich wood prop. To bolt the prop to the hub the Jabiru manual calls for AN4-46A bolts with Belleville washers and nylock nuts. The Sensenich installation manual calls for safety wiring the bolts.
So, here are my questions.
I don't seem to find Belleville washers at the online aircraft supply stores. Are they called something else?
Should I get bolts with pre-drilled heads and safety wire them?
I would think there is no point to drilling and wiring the nuts, as they could not be re-torqued without replacing everything.
Is there anything else I should keep in mind?
Thanks in advance.
John Eynon
Lightning kit #53
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jeynon2
Joined: 25 Oct 2007
Posts: 24
Location: Southern Illinois
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| Posted: Tue Jul 29, 2008 12:49 pm Post subject: Re: Prop bolts |
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I just checked whether AN5 bolts would fit, and while they will go through the propeller (looks like the propeller could even take AN6) the mounting bushings and plate are drilled for AN4.
John
[quote="Wayne Lenox"]
Just finished with my Lightning. I think we used AN5 bolts. washers and Nylock nuts. I did re- torque after 15 hrs. to 17 1/2 ft lbs.
Wayne
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IFLYSMODEL(at)aol.com
Guest
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| Posted: Tue Jul 29, 2008 1:39 pm Post subject: Prop bolts |
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Yes John: I worked on my Lightning from the 7 th to the 18 th and put the prop on either the 17 th or the 16 th. I had to drill out the mounting bushings and the front plate to take the larger bolts. I do not remember what size I drilled it out to. I recommend checking with Nick or Mark at Arion. (Yeah I know, they are at Oshkosh.)
Lynn Nelsen Serial # 60.
In a message dated 7/29/2008 4:52:41 P.M. Eastern Daylight Time, jeynon2(at)verizon.net writes:
| Quote: | --> Lightning-List message posted by: "jeynon" <jeynon2(at)verizon.net>
I just checked whether AN5 bolts would fit, and while they will go through the propeller (looks like the propeller could even take AN6) the mounting bushings and plate are drilled for AN4.
John
[quote="Wayne Lenox"]
Just finished with my Lightning. I think we used AN5 bolts. washers and Nylock nuts. I did re- torque after 15 hrs. to 17 1/2 ft lbs.
Wayne
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selwyn
Joined: 12 Mar 2008
Posts: 102
Location: Australia
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| Posted: Tue Jul 29, 2008 4:49 pm Post subject: Re: Prop bolts |
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There was a discussion of this some time ago on the Jabiru engine list. See http://forums.matronics.com/viewtopic.php?p=37783
This talks about a source for washers here
http://www.mcmaster.com/
but I'm sure Arion, being Jab agents, could also supply.
The Jabiru assembly manual also has some words on the differences between Jabiru and Sensenich prop mounting in their constructors manual here
http://www.jabiru.net.au/Manuals/Airframe%20Construction/Sections/Post-Paint_Fuselage_Engine_Fit%20propeller%20and%20spinner_JALL.pdf
As I understand it, the differences in securing methods between the two prop types are largely driven by the Sensenich being built from harder timber than the Jabiru.
It seems from the above that there are several methods which can be used to secure the mount. If methods which secure the nut to the bolt, such as locknuts or castlenuts, are not used then it is important that both ends of the fastener are secured. That does mean that lockwire for example will have to be removed each time the tension is to be checked.
Those of course are just my thoughts. The real wisdom on securing is in "the bible" AC43-13-2B. Some good stuff on fasteners, nuts, lockwiring etc. in Ch 7
Cheers.
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info(at)flylightning.net
Guest
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| Posted: Tue Aug 05, 2008 5:18 am Post subject: Prop bolts |
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The prop guide bushings must be drilled out, we use a 3/8" bit and so does
the aluminum crush plate.
Nick Otterback
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info(at)flylightning.net
Guest
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| Posted: Tue Aug 05, 2008 5:19 am Post subject: Prop bolts |
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Bolts with a lightning and wood sensensich prop should be AN6-45A nylocs bellvills and std washers if needed.
Nick
From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of Wayne Lenox
Sent: Tuesday, July 29, 2008 3:18 PM
To: lightning-list(at)matronics.com
Subject: Re: Prop bolts
Jeynon
Just finished with my Lightning. I think we used [b]AN5[/b] bolts. washers and Nylock nuts. I did re- torque after 15 hrs. to 17 1/2 ft lbs.
Wayne
-- "jeynon" <jeynon2(at)verizon.net> wrote:
--> Lightning-List message posted by: "jeynon" <jeynon2(at)verizon.net>
After the great response I received on the prop hub question, I thought I would try again with the prop itself. I'm using a wood Sensenich wood prop. To bolt the prop to the hub the Jabiru manual calls for AN4-46A bolts with Belleville washers and nylock nuts. The Sensenich installation manual calls for safety wiring the bolts.
So, here are my questions.
I don't seem to find Belleville washers at the online aircraft supply stores. Are they called something else?
Should I get bolts with pre-drilled heads and safety wire them?
I would think there is no point to drilling and wiring the nuts, as they could not be re-torqued without replacing everything.
Is there anything else I should keep in mind?
Thanks in advance.
John Eynon
Lightning kit #53
Read this topic online here:
http://forums.matronics.com/viewtopic.=====================; - MATRONICS WEB F================================================nbsp; &================================================
____________________________________________________________
No more waiting. Click now to experience the thrill of high speed Internet! | Quote: | | http://www.matronics.com/Navigator?Lightning-List |
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info(at)flylightning.net
Guest
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| Posted: Tue Aug 05, 2008 5:20 am Post subject: Prop bolts |
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John,
We have prop bolts kits available if you would like one....
Nick Otterback
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jeynon2
Joined: 25 Oct 2007
Posts: 24
Location: Southern Illinois
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| Posted: Tue Aug 05, 2008 8:07 pm Post subject: Prop bolts |
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Nick,
Hope everything went well at Oshkosh. I wish I could have made it.
I would like you to send me a prop bolt kit. Do the prop bolts need to be safety wired?
I received my replacement spinner (hope you got my old one back), but I think it may be polished aluminum instead of chrome. It's a little hard to tell without seeing both of them next to each other. Perhaps you could let me know what your records indicate.
Thanks.
John Eynon
On Aug 5, 2008, at 8:17 AM, flylightning wrote:
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