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ACRO E-mail Archive Thread: [Acro] Re: Pitts S-1S bungee installation

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ACRO E-mail Archive Thread: [Acro] Re: Pitts S-1S bungee installation


Thread: [Acro] Re: Pitts S-1S bungee installation

Message: [Acro] Re: Pitts S-1S bungee installation

Follow-Up To: ACRO Email list (for List Members only)

From: "Herman Dierks" <hdierks at>

Date: Sat, 21 Sep 2002 05:07:26 UTC


  Remove the belley pan.

I like to support the plane with a hoist of some sort (usually attached to
I-beam in hangar roof) and to the loop in the top of the engine case (made
for hanging the engine. Other way is to put a chain or nylon strap around
rear motor mount area and attach hoist there. 

Yes, just cut the old bungies off.  But you need to have plane supported
(off the gear) first. 

I dip my bungies in hot wax, but soap or powder probably work well also. 
Yes, the new bungies look very stiff, and they are.  Thats why you need a
good tool.
Loop bungie over aft side and attach tool to forward (firewall) side and
pull them up.
As Robert Armstrong says, this is the point where you want to wear a
football helmut or motor cycle helmut!! Those bungies store a lot of
It may take a slight "tap" to push it off the tool an onto the attach
Put the matached pair on the same side. 

Make sure there is a safety cable on your gear. Its there in case the
bungies break during a landing.


> From: Klusmanp at
> To: acro at
> Subject: [Acro] Pitts S-1S bungee installation
> Date: Thursday, September 19, 2002 10:19 PM
> A few questions about Pitts S-1S bungee installation and removal:
> 1) How do I secure the gear during the bungee swap? Both gear legs have
> sheet metal tabs welded onto the diagonal gear struts just inboard of
> the bungees attach. These tabs look like they might be a jack point
> to secure the gear during bungee swap. Does this sound familiar to
anyone? My 
> other idea is to use hoseclamps to secure the gear against the horizontal

> tube that runs along the bottom of the firewall. Has anyone done this?
> 2) How to remove the old bungees? Just cut them off with a sharp knife?
> 3) The new bungees are hard as a rock. Do I need to condition them or put
> pre-stretch on them?
> 4) I've got the lower cowl and firewall coverplate off so I can see the
> side of the bungees. I've still got the forward belly pan in place and I 
> think I can get the bungee swap done without removing this belly pan. Is 
> there a possibilty I might damage the belly pan if I don't remove it? It 
> wouldn't be that much of a pain to take the belly pan off except for a
> drain fitting that would need to be removed so I would have to drain all
> fuel, etc.
> Thanks!
> Paul Klusman
> Pitts S-1S


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