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Cattrell
Member since Nov-4-05
70 posts		 Oct-12-07, 01:25 AM (CST)
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"Hatz Classic Plan Revisions"
 
   I have wanted to start a thread on the problems and conflicts found on the classic plans for some time now. I have found several and I would like to share them in hopes to save the next guy some grief. Even if there is a little clarification you think might help someone, I would like to post it.

I will post my findings to date in the next few days when I have my plans handy.

Does anyone else have an interest in this??

Thanks,
Jeff Cattrell

www.cattrell.net


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  Subject     Author     Message Date     ID  
  RE: Hatz Classic Plan Revisions mmcgrew Oct-12-07 1
  RE: Hatz Classic Plan Revisions klr12 Oct-12-07 2
  RE: Hatz Classic Plan Revisions Cattrell Oct-15-07 3
     RE: Hatz Classic Plan Revisions dougm Oct-16-07 4
  RE: Hatz Classic Plan Revisions Cattrell Nov-19-07 5
  RE: Hatz Classic Plan Revisions Cattrell Nov-19-07 6
     RE: Hatz Classic Plan Revisions rlynn Dec-05-07 7
         RE: Hatz Classic Plan Revisions Nick Boughen Mar-22-09 8
             RE: Hatz Classic Plan Revisions rons Mar-23-09 9
                 RE: Hatz Classic Plan Revisions Nick Boughen Mar-23-09 10
                     RE: Hatz Classic Plan Revisions Ebby37 May-28-09 11

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mmcgrew
Charter Member
291 posts		 Oct-12-07, 06:49 AM (CST)
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1. "RE: Hatz Classic Plan Revisions"
In response to message #0
 
   I would. I have had to work through many errors and lacking info on the classic plans. When I purchased (and started) in 03, Jeff had intentions of finishing the plans. In 03 the plans were only about 85% complete. As it went, many of the details I requested were never supplied and many phone calls were never returned. I do not know if they are available now. If Jeff has lost interest in the classic, it would be great if some one could finish the design.

Michael
N838MM


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klr12
Charter Member
87 posts		 Oct-12-07, 10:07 AM (CST)
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2. "RE: Hatz Classic Plan Revisions"
In response to message #0
 
   Jeff,
I'm interested. I just assumed I had a complete set of plans. I never heard anything different. When I purchased them from Makelan in 2005, there was never a word from Jeff about them being incomplete. I too would like to see somebody else get hold of the rights to the Classic and start supporting it correctly. I offered to do just that 2 years ago but was turned down flat. Jeff told me then that he was planning on providing all the support we would need when he retired. I don't believe I have been able to contact him since that conversation.
Kevin Rupert
HC #039


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Cattrell
Member since Nov-4-05
70 posts		 Oct-15-07, 10:24 AM (CST)
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3. "RE: Hatz Classic Plan Revisions"
In response to message #0
 
   Sheet #06
Center Section Fitting FSTW1 and RSTW1, the dimentions from the end of the spar should be 1" instead of 3/4" as shown. These are meant to be measured from the 1/4" end rib. This is noted on another sheet but not this one.

Sheet #07
The aileron spar dimentions are wrong, the taper as shown will put the aileron in a bind. I made mine from several pictures of completed planes and it seemd to work well. I will try to post some dimentions of what I used.

Sheet #09
The fitting on the root end of the rear spar is shown to be located with the holes 3/4" off of the bottom of the spar, this dimention should be 1". If left at 3/4" the wing will not line up with the center section.

General.
The spar tapers I used do not match the ones shown on the plans, I couldn't get the #10 rib to work with the tapers that they showed.

This is all I can remember right now...
Please add to this post if you know of any other issues.

Thanks!

www.cattrell.net


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dougm
Member since Jul-20-05
75 posts		 Oct-16-07, 08:51 AM (CST)
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4. "RE: Hatz Classic Plan Revisions"
In response to message #3
 
   Jeff,

Thanks for starting this thread! I expect to be encountering some of these over the next few months.

Let's all do our best to keep this thread up to date.

Doug
HC 093
Hatz Webmaster
MA Rep - The International Cessna 170 Association

www.damowry.com


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Cattrell
Member since Nov-4-05
70 posts		 Nov-19-07, 09:18 PM (CST)
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5. "RE: Hatz Classic Plan Revisions"
In response to message #0
 
   Aileron Spar:
On sheet 7 of the plans the dimentions for the aileron don't quite work out right.
I used the following:
Center of the tip...3/4" down from the top
tip width is still 3/4"...I made mine a slight bit wider to sand down to the wingtip...
Top taper starts 7 3/4" in from tip
Bottom taper starts 21 1/4" from the tip.
these dimentions worked great into my tips and the aileron can use almost a full length hinge with no bend....

Jeff Cattrell

www.cattrell.net


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Cattrell
Member since Nov-4-05
70 posts		 Nov-19-07, 09:37 PM (CST)
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6. "RE: Hatz Classic Plan Revisions"
In response to message #0
 
   Here's a picture:



www.cattrell.net

Attachments

http://www.hatzbiplane.com/dcforum/User_files/4742565c0ae0bf72.jpg

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rlynn
Charter Member
36 posts		 Dec-05-07, 04:11 PM (CST)
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7. "RE: Hatz Classic Plan Revisions"
In response to message #6
 
   I think this is a great idea. I too have found enough discrepancies that I recheck everything before cutting. When working wood parts I make a "template" first out of cheap pine or poplar so I ruin that instead of the spruce. I will contribute as I find probs. From memory, the hole positions for the rear spar of the center secrion are off by about an eigth of an inch. I'm redoing my rear spar so the wings match up right.

Thanks, Rob


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Nick Boughen
Charter Member
235 posts		 Mar-22-09, 10:08 AM (CST)
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8. "RE: Hatz Classic Plan Revisions"
In response to message #7
 
  
Hello folks,

This is a good thread. I'm just laying out my cuts n holes for my bottom wing spars and have a few questions

1. The plans show that the 27 degree taper at the root of the bottom wing spars to not come to a point with the bottom edge of the spar, that the point is "cut off" a bit. This doesn't seem right. Can anyone straighten me out on this?

2. The dimensions of the spar tips are not noted for the bottom wing. For the upper wing, it says they should be 3/4", so I'd presume the same for the bottom spars, but they are drawn larger. They measure and scale out to 1-1/8". Are they really 3/4"? I think probably, since the wing bow itself is only 1/2". Clarification would be appreciated.

3. I'm nervous about cutting this very expensive words. Any advice? ;D

Nick


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rons
Charter Member
17 posts		 Mar-23-09, 07:22 AM (CST)
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9. "RE: Hatz Classic Plan Revisions"
In response to message #8
 
   Nick,
The reason that the 27 degree taper does not go all the way to the bottom of the spar is so there is wood there to keep the spacing for the wing attach fittings.

The spar tips are the same for top and bottom wings, 3/4 of an inch.

Ron


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Nick Boughen
Charter Member
235 posts		 Mar-23-09, 09:32 AM (CST)
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10. "RE: Hatz Classic Plan Revisions"
In response to message #9
 
  
Thanks very much, Ron,

Nick


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Ebby37
Member since Nov-3-06
39 posts		 May-28-09, 07:31 PM (CST)
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11. "RE: Hatz Classic Plan Revisions"
In response to message #10
 
   I working on the top wings and am finding the bill of materials does not exactly match the hardware called out on the plans. Time permitting I'll put together a hardware list based on what I ended up using. Or, the plans do not call out the hardware at all or it's in error. I would suggest being very cautious purchasing your hardware based on the materials list in the upper right corner of the plans sheets. I ordered all my hardware at once and now I am finding discrepancies between the bill and the plans sheets.

Note, I am not putting ailerons on the top wings.

Ebby
Hatz Classic 037
A work in progress.


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