1970 s2 0453R - A new Beginning

[TurboFource]

Thanks Kendo for getting measurements for Gavin.

[GavinT]

Thanks for the numbers, Kendo.
I plan on making a doubler in the TC/S style for the hole in my S2 chassis.

A mate of mine is an aero engineer. He has a sturdy chassis jig and did some torsional testing on a S2 chassis just out of interest.

He said that as the torsional load builds, the side panels of the chassis start to flex. He surmised that installing zig zag stiffeners along the vertical sides of the backbone would delay & mitigate the onset of this.

Kram's X brace idea sounds good, too. In fact it wouldn't be all that difficult to fabricobble a number of internal braces which would essentially force the tunnel to act as a series of shorter boxes instead of the single long one.

[BDA]

Attaching with some hi-loc pin rivets. Instead of spot welding then in. Another thought is to use rivnuts on the lower sheet . We’ll see .

The reason I recommend rivets is that you get a more intimate connection between the parts because they expand to fill the hole. With bolts there will almost have to be a little wiggle. I might be convinced that I'm being over cautious and that they would be completely adequate but I think rivets make a better join.

I'm also not sure that completely covering the hole will be a good idea (did I misunderstand you?). I think you may need access into the backbone from time to time.

[dakazman]

 Good reasoning Jim.
    After thinking about it half a day while cutting the lawn I came up with this . I’ve use a similar repair on an aircraft structure. Between the plates I’ll apply a sealant to stop any movement between the plates . It will have to do for now . I have a hurricane to contend with this coming week.
  The two holes top side are to pick up the rivnuts casings all ready installed. The bolts or nuts around the perimeter will be welded in. The two holes in the center will be enlarged to accommodate my thumb and index finger to hold it in place while locating.  I all ready finagled the lower plate in but I do still have to check for clearance above heater lines that are still installed.
 It looks doable and it will cut down on the heat coming up from the water lines. Something else I noticed while idling it extensively.
Dave

[dakazman]

 I made a little progress today but had to put it off to prepare for this hurricane.  Aiming for central part of the state, which would mean running directly over me . It’s has a lot of ground to cross but I’m worried about it stalling or regaining strength when it hits the Atlantic.
   Enough said, I boarded up today and I’ll be off helping my neighbors.
  Just have to weld up the nuts to the underside , paint and install.
 Dakazman

[BDA]

You and your family, stay safe!! It's cat. 5 now and even though it's supposed to drop to cat 3 before making landfall, it sounds like a monster now and predicting what and where a hurricane will go or do is hit or miss as you know.

[dakazman]

  We’ll do Jim ,
 Dave

[Bryan Boyle]

  We’ll do Jim ,
 Dave

fingers crossed (as I wander out to the aerodrome to load up my plane with supplies for a volunteer relief flight to western NC to assist).  Citizens have to step up and help their neighbors when the official organs fail....

[BDA]

THANK YOU SO MUCH, Bryan!! The devastation there is hard for even me, who grew up in New Orleans so no stranger to big hurricanes, to take in. Thankfully I can’t imagine what it’s like for all those who lost everything. I have such admiration for all the people who have volunteered and shared resources! God bless you!

[dakazman]

THANK YOU SO MUCH, Bryan!! The devastation there is hard for even me, who grew up in New Orleans so no stranger to big hurricanes, to take in. Thankfully I can’t imagine what it’s like for all those who lost everything. I have such admiration for all the people who have volunteered and shared resources! God bless you!

   
   I can't agree more with BDA said.
  Bryan, your top notch in my book and if you need work done on your aircraft, I may know some FBO's that still may be operating in PA.
Dakazman

[Bryan Boyle]

THANK YOU SO MUCH, Bryan!! The devastation there is hard for even me, who grew up in New Orleans so no stranger to big hurricanes, to take in. Thankfully I can’t imagine what it’s like for all those who lost everything. I have such admiration for all the people who have volunteered and shared resources! God bless you!

No praise needed. It's what we do, that's all.  Was a couple decent flights, got two runs in over two days.  Folks on the ground were great, no interference from officials.  ATC handled everything with professionalism.  Couldn't ask for more.

[Bryan Boyle]

THANK YOU SO MUCH, Bryan!! The devastation there is hard for even me, who grew up in New Orleans so no stranger to big hurricanes, to take in. Thankfully I can’t imagine what it’s like for all those who lost everything. I have such admiration for all the people who have volunteered and shared resources! God bless you!

   
   I can't agree more with BDA said.
  Bryan, your top notch in my book and if you need work done on your aircraft, I may know some FBO's that still may be operating in PA.
Dakazman

Appreciate it.  Now, to relax, a couple fingers of single malt...and rest up for the weekend.  Have my 50th HS reunion saturday...and some students sat morning and sunday afternoon.    Retirement is fun!

[BDA]

No praise needed

But well deserved! I'm glad things went smoothly. I heard from some pilots who were hassled. Maybe that foolishness stopped. I'm sure you enjoyed your single malt! You deserved that as well!

[dakazman]

  I got back to the Europa’s muffler heat shield, that works extremely well and the repair to my frames inspection hole.
 The muffler/ shield  is now under the tweaking process, lower, lighter and final appearance. Functionally I can put my hand on the cover and not feel any appreciable heat. I used my digital thermometer on it but that picture had extreme glare on the readout.
 Then I started installing the plates to enhance the structure around the inspection hole. I decided to add a third plate between the two I had already made but by adding a “plug” to take up the top and bottom plates will spread the load or stress. On aircraft we use a sealant between the layers but it may be overkill in this case .
 Gavin, thanks for pointing out my blunder and enlightening that area of stress to me.
Dakazman

[BDA]

What about the heater and choke cables that go through the access hole you covered up?