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tc1917(at)hughes.net
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 Posted: Wed May 30, 2007 2:58 am Post subject: prop bolts |
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okay, I am a novice talker so I need some clarification on this bolt talk.
are you saying we MUST use only the 8.8 metric bolts for props supplied by
the prop people (can warp supply these for us?) or CAN we use standard
stainless bolts without any problem? Not a rocket scientist here so if
someone could clarify for us dummies. I need to add an extension to my hub
also (1/2 inch would do). thanks. ted cowan, alabama
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jindoguy(at)gmail.com
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| Posted: Wed May 30, 2007 5:14 am Post subject: prop bolts |
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Ted, Use what your prop maker recommends. My Warp Drive came with 8.8 metric bolts, my Power Fin came with stainless steel socket head cap screws, also in metric, and the Ritz prop on the Firestar uses AN bolts as does the IVO prop on the MiniMax.
The only real rule I follow is, I do NOT, under any circumstances, use grade 8 bolts as prop bolts. They are far too brittle for the application.
In the particular application I was speaking of, I found grade 8's threaded into an aluminum pulley. The threads were already cut (5/16-18 UNC), and I was stuck. I wouldn't sign off the annual and leave the grade 8's in place, so I had to come up with a replacement. The only other option would have been to tap the holes for thread inserts and make the threads metric that way. I found SS bolts at McMaster Carr that gave enough shank length so I could shorten the threads to end up with bolts that satisfied the prop maker's requirements.
Rick
On 5/30/07, tc1917 <tc1917(at)hughes.net (tc1917(at)hughes.net)> wrote:[quote] --> Kolb-List message posted by: "tc1917" <tc1917(at)hughes.net (tc1917(at)hughes.net)>
okay, I am a novice talker so I need some clarification on this bolt talk.
are you saying we MUST use only the 8.8 metric bolts for props supplied by
the prop people (can warp supply these for us?) or CAN we use standard
stainless bolts without any problem? Not a rocket scientist here so if
someone could clarify for us dummies. I need to add an extension to my hub
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport. [quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed May 30, 2007 6:30 am Post subject: Re: prop bolts |
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Ted,
Just a thought. The holes in your engine prop hub are metric. If you use standard bolts that fit that would give them some room to move. That is maybe why they all use metric. If you tighten these to MFG. specs at
175 in/lbs. then they will move when the props hammer down to a stop.
When you tighten the 1/4" bolts on the prop hub itself they will need to be retorqued after you tighten the engine hub bolts at 175 in/lbs. The inner 1/4" prop bolts tightened to 120 in/lbs will be loose again. Call Warp Drive and see what bolt they recommend. When I replaced my engine 8.8 metric hub bolts on the Kolb I was able to find the indenticle bolt at an Ace Hardware.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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| Posted: Wed May 30, 2007 2:03 pm Post subject: prop bolts |
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Hi,
I just got off the phone with Daryl at Warp drive about the prop bolts and
the standards for them. He tells me that other than some zinc on them for
corrosion, they are standard Metric bolts and the ones purchased at any of
the auto parts stores will do the job. I shall do so this Friday.
Larry C, Oregon
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DBforfun
Joined: 17 May 2007
Posts: 12
Location: N Calif.
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| Posted: Wed May 30, 2007 3:36 pm Post subject: prop bolts |
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Does someone know the thread pitch for the metric prop bolts?
Thanks
In a message dated 5/30/2007 3:04:37 P.M. Pacific Daylight Time, lcottrell(at)fmtcblue.com writes:
| Quote: | --> Kolb-List message posted by: "Larry Cottrell" <lcottrell(at)fmtcblue.com>
Hi,
I just got off the phone with Daryl at Warp drive about the prop bolts and
the standards for them. He tells me that other than some zinc on them for
corrosion, they are standard Metric bolts and the ones purchased at any of
the auto parts stores will do the job. I shall do so this Friday.
Larry C, Oregon es Day --> - NEW MATRONICS WEB FORUMS -
bsp; --> ======================
|
See what's free at AOL.com.
[quote][b]
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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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| Posted: Wed May 30, 2007 6:01 pm Post subject: prop bolts |
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| Quote: |
Does someone know the thread pitch for the metric prop bolts?
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Depends on the diameter....
http://www.precisionscrewandbolt.com/metric.htm
Metric grade 8.8 are 85kpsi proof and 120kpsi tensil, similar to
SAE Grade 5 specs..
Jim Baker
580.788.2779
Elmore City, OK
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jindoguy(at)gmail.com
Guest
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| Posted: Wed May 30, 2007 6:49 pm Post subject: prop bolts |
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The 8mm bolts used with Rotax gearboxes are 1.25 mm pitch.
Rick
On 5/30/07, Jim Baker <jlbaker(at)msbit.net (jlbaker(at)msbit.net) > wrote:
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport. [quote][b]
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