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[Pulsar-Aviators] Nose gear failure

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ccoulter(at)wavecable.com
Guest

Posted: Wed May 21, 2014 5:36 pm Post subject: [Pulsar-Aviators] Nose gear failure

Interested but am not a member of the yahoo net.



Clarke



On Mon, 5 May 2014 15:20:39 -0500

  "Tim Engel" <TSEngel(at)comcast.net> wrote:

 	  Quote: 	
		   

<TSEngel(at)comcast.net>

 

 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. 

 

Un/Subscription,

Forums!

Admin.

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docyukon(at)ptcnet.net
Guest

Posted: Wed May 21, 2014 6:09 pm Post subject: [Pulsar-Aviators] Nose gear failure

Clark  Was thair a prop strike on landing, also was thair any fuselodge 

structual damage other than the firewall and lower cawel.    Bill S.

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TomisFlyingby(at)comcast.
Guest

Posted: Wed May 21, 2014 7:26 pm Post subject: [Pulsar-Aviators] Nose gear failure

Ron,

  

 I know this is really late but do you still have any of the nose gear  modification parts left?  Where did you have yours done?  

  

 Thanks,

 Tom

    

  From: Ron Koval (ronko(at)att.net) 

 Sent: Monday, May 05, 2014 10:00 AM

 To: Pulsar-Aviators(at)yahoogroups.com (Pulsar-Aviators(at)yahoogroups.com)  ; Pulsar Builders (Pulsar-List(at)matronics.com) 

 Subject: Re: [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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ccoulter(at)wavecable.com
Guest

Posted: Thu May 22, 2014 7:12 am Post subject: [Pulsar-Aviators] Nose gear failure

Bill



Yes there was a prop strike.  I don't think it damaged the 

engine tho.  There was a small area of damage to the left 

side.



Clarke

On Wed, 21 May 2014 21:08:45 -0500

  "Bill S" <docyukon(at)ptcnet.net> wrote:

 	  Quote: 	
		   

<docyukon(at)ptcnet.net>

 

 Clark  Was thair a prop strike on landing, also was 

thair any fuselodge structual damage other than the 

firewall and lower cawel.    Bill S. 

 

Un/Subscription,

Forums!

Admin.

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PreCompTech

Joined: 29 Jun 2013
Posts: 16
Location: Scappoose, OR

Posted: Mon Jun 15, 2015 4:09 pm Post subject: Re: [Pulsar-Aviators] Nose gear failure

What is the required thickness of the Belleville spring washers that are used in the fork assembly?

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