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[Pulsar-Aviators] Nose gear failure

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ronko(at)att.net
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Posted: Mon May 05, 2014 7:04 am Post subject: [Pulsar-Aviators] Nose gear failure

Having done modification last year, I still have about 7 inches left over (you only need about 3-1/2") from the Aircraft Spruce purchase of 4130 STEEL TUBE 1X.188 1FT

 Part #: 03-06800-1 to make this modification (along with your own 5/8" bolt, etc.).  $5 plus shipping cost, its yours.  Add another $5 and I'll include 2 brand new belleville washers.

Ronko



        From: "gregsmi(at)aol.com" <gregsmi(at)aol.com>

 To: pulsar-list(at)matronics.com;  Pulsar-Aviators(at)yahoogroups.com 

 Sent: Saturday, May 3, 2014 8:42 AM

 Subject: [Pulsar-Aviators] Nose gear failure

  

 

                                       

Clarke Coulter just reported his nose gear failed on take off. His landing  was uneventful but the plane did sustain damage. His nose gear is the  Aerodesigns gear with the spindle shaft welded inside a collar. Since the  failure is occurring inside the collar, there is no way to inspect. 

  

 If you have one of these nose gears you should look on the forum to see  what modifications others have done to make this area stronger and easy to  inspect. It could save you from having to rebuild your aircraft.  

      

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Eclat2

Joined: 06 Sep 2013
Posts: 13
Location: Minneapolis, Minnesota, USA

Posted: Mon May 05, 2014 12:21 pm Post subject: [Pulsar-Aviators] Nose gear failure

I've created a folder in the Pulsar-Aviators Files section titled:

Pulsar XP - Nose Gear Modifications

http://tinyurl.com/lmf5zxh



There are three files in it:



1) Pulsar III - SkyStar Nose Wheel Exploded Parts DRAWING.jpg

... SkyStar's Pulsar III Nose Gear Design for Comparison

2) Pulsar XP - Nose Gear Modification - Drawing, Bob Hartunian.jpg

3) Pulsar XP - Nose Gear Modification - Smith-Hartunian, Koval.doc



The first is just an exploded parts diagram of the SkyStar Pulsar III 

nose gear design for comparison.   Something supporting a similar 

weight FWF package without breaking.



I believe the second file is the modification drawing done by Bob 

Hartunian and Greg Smith that Herbert inquired about.



The third is a Word.doc I threw together from clippings of posts on 

Pulsar-Aviators about the Greg Smith/ Bob Hartunian modification, 

and the similar but different mod done by Ron Koval.   It's a rough 

1st Draft.   I've not designed anything, and don't claim to have any 

answers,  but I'm hoping Greg, Bob and Ron,  and anyone else who has 

done a similar modification will proof read it and offer additional 

content.   With enough input, perhaps we can come up with a go-to 

document that owners can reference when, or hopefully before the need 

arises.



I'll do the keyboard work to put together the Word.doc, if that's 

what it takes.   But I need some input...  like, "All" the input.



If you suggest a change or addition, then flesh it out.   Don't 

suggest a vague idea like you think I'm going to design it.   Won't 

happen.   I'll try to collate the document to include the good design 

work and execution of others, "IF" they're okay with that;  but I'm 

in no position to design an aircraft landing gear.   If I did, you 

wouldn't want it on your plane!



*~*~*



In that Word.doc, I included a few questions that came to mind before 

I even started writing.   Let's start there, plus anything else you 

think of.



1)  Are all new 4130 steel parts to be used without additional heat 

treating/ stress relieving?   Bob?



2)  The Pulsar XP nose gear design used a alternating stack of 6 

Belleville Spring Washers, sandwiched between two thrust washers.   I 

don’t see the Belleville washers documented in the Smith/ Hartunian 

design,  but Ron Koval at least mentions them (ie, says he has extras 

for sale).   Are the Belleville washers still used in either or both 

of those designs?   For now, I’ve included them in the "Materials" 

lists.



2)  Skystar’s Pulsar III nose gear design appears to use two “top 

 hat” bushings in the vertical “Sleeve” (boss/ trunnion), one top and 

one bottom.   Do your designs do anything about friction other than a 

little lubrication?



3)  Any thoughts on a recommended torque value to use when assembling 

the new pivot?



Regards,

Tim Engel



From: Greg Smith, gregsmi(at)aol.com

To:     pulsar-list(at)matronics.com; Pulsar-Aviators(at)yahoogroups.com

Sent:  Saturday, May 3, 2014 8:42 AM

Subj: [Pulsar-Aviators] Nose gear failure



Clarke Coulter just reported his nose gear failed on take off. His 

landing was uneventful but the plane did sustain damage. His nose 

gear is the Aerodesigns gear with the spindle shaft welded inside a 

collar. Since the failure is occurring inside the collar, there is no 

way to inspect.



If you have one of these nose gears you should look on the forum to 

see what modifications others have done to make this area stronger 

and easy to inspect. It could save you from having to rebuild your 

aircraft.

- The Matronics Pulsar-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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