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RE: Herr Pitts Special Kit Build Thread - 10/30/2007 7:01:12 AM   
somegeek



Posts: 2118
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline 		Started on the upper wing tonight...



Next, the instructions state to cut a piece of sheeting to fit between the TE sheeting and the spar. Will be easier to let these pieces dry and then remove them to trace what needs to be cut on the 1/16" piece of sheeting. Having a photocopy of this section of the plan would be nice to cut a template for the sheeting piece.

somegeek

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Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

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       Post #: 51

RE: Herr Pitts Special Kit Build Thread - 10/30/2007 2:34:03 PM   
jlkonn



Posts: 1277
Joined: 1/2/2003
From: Planet Earth, IA, USA
Status: offline 		SomeGeek,
If I may ask...
What is the function of the clothespins?
You 1/2A guys have such clever build ideas I just have to ask.
I've never seen it before.
Thanks!
JLK


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       Post #: 52

RE: Herr Pitts Special Kit Build Thread - 10/30/2007 4:05:41 PM   
somegeek



Posts: 2118
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline
quote:

ORIGINAL: jlkonn

SomeGeek,
If I may ask...
What is the function of the clothespins?
You 1/2A guys have such clever build ideas I just have to ask.
I've never seen it before.
Thanks!
JLK


I wanted to pinch the blocks against the spars so I put pins on both sides and used a clothes pin to pull the ends together.

somegeek

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Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

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       Post #: 53

RE: Herr Pitts Special Kit Build Thread - 10/31/2007 8:23:11 AM   
somegeek



Posts: 2118
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline 		Got the lower middle sheeting cut and in place... but cut a little narrow. Didn't follow my sig - measure three times, cut once. Was able to use the cut-out from the bottom though to fill the sides since the angles were complimentary...



Added the middle ribs. The laser cutting process seems to slightly taper the edges of the wood material as the one side of the cut where the laser hits is clean and open whereas the bottom of the cut in the material is more narrow. Used pins to keep those ribs square that needed the support...



Time to start altering the wing for the upper ailerons. The ribs require minimal alteration to allow for the installation of the upper aileron and you can use the bottom ribs as a template for the TE. As you can see in the following pic with the lower wing rib placed atop an upper wing rib...



I'll need to cut slots for the sheeting and the TE piece... but it's 12:20am - time to sleep.

somegeek

_____________________________

Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

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       Post #: 54

RE: Herr Pitts Special Kit Build Thread - 10/31/2007 1:39:25 PM   
Tee Bee


 

Posts: 745
Joined: 2/22/2007
From: Angleton, TX, USA
Status: offline 		lookin' good

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       Post #: 55

RE: Herr Pitts Special Kit Build Thread - 10/31/2007 5:51:30 PM   
Doug-716



Posts: 16
Joined: 3/1/2007
From: Almont, MI, USA
Status: offline 		Ironic I found this thread, my kit is in the mail as we speak! I can't wait.

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       Post #: 56

RE: Herr Pitts Special Kit Build Thread - 11/1/2007 6:19:42 AM   
Krener


 

Posts: 213
Joined: 11/5/2006
From: AS, AUSTRALIA
Status: offline 		Somegeeks build threads are a great help 'cause his pics are clear are excellent, and details well written and to the point.

Makes it alot easier to build the same kit when someone has gone to all this effort both for themselves and others.

Thanks SG.

Now if you could also build a Herr Mustang, I'd be muchly appreciative

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       Post #: 57

RE: Herr Pitts Special Kit Build Thread - 11/1/2007 8:36:36 AM   
somegeek



Posts: 2118
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline 		Thanks for the kind words guys.

Got the majority of the modification done to the upper wing to get the barn door aileron slot area created.

1) Cut the TE sheeting on the outer edge of the rib #2 in the pic so the rib can sit on it.
2) Install rib - this rib will need to have the top TE sheeting groove cut into it.
3) Place the TE lower sheeting piece in place and trim to length. I did butt the lower TE sheeting against the ribs numbered 2 and 5 in the pic. You could notch the lower side of the ribs to sit on top of the sheeting as well.
4) Install 3/16" TE strip(leftover spar pieces worked here along with a few inches from a new spar stock piece).
5) Install outer-most rib - this rib will need to have the top edge sheeting groove cut into it(I forgot to do this in this pic).
6) Install T-5 Rib with doublers. If using Titebond or a variant, make sure you clear out any extra that might be in the groove before you set this piece in place.
7) install rib - alter this to look the same as one of the lower wing L-3 ribs.



I've still gotta do some clean-up on the area where the upper TE sheeting will sit. Forgot to clear the area on the outer-most rib for the TE sheeting so will do this before I add that piece. As stated above, use a rib from the lower wing for a template to shorten your ribs and as a guide to easily trim your ribs using a straight edge razor.



I didn't like the torsional flex in the wooden dowel used to join the elevator halves so I replaced it with a piece of 1/8" carbon fiber rod and secured with flash black rubberized CA. Should be solid now.



Looking forward to pulling this off the board tomorrow and seeing if this made the elevator that much more rigid.

somegeek

< Message edited by somegeek -- 11/1/2007 8:37:26 AM >

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Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

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       Post #: 58

RE: Herr Pitts Special Kit Build Thread - 11/1/2007 10:51:10 AM   
Krener


 

Posts: 213
Joined: 11/5/2006
From: AS, AUSTRALIA
Status: offline 		The dowel in the elevator halves that you replaced, is it to flimsy?

This might seem naive, but why rubberised CA, and not epoxy?Weight saving?

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RE: Herr Pitts Special Kit Build Thread - 11/1/2007 3:50:50 PM   
somegeek



Posts: 2118
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From: Vancouver, WA, USA
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quote:

ORIGINAL: Krener
The dowel in the elevator halves that you replaced, is it to flimsy?


I thought so myself. I tried to add a few drops of CA to see if it'd absorb to make it more rigid but that didn't do the trick. This carbon fiber rod is much more rigid so this will work.

quote:


This might seem naive, but why rubberised CA, and not epoxy?Weight saving?


I don't have thick CA so I used this. Sets up really solid despite being called 'rubberized'.

somegeek


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Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

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       Post #: 60

RE: Herr Pitts Special Kit Build Thread - 11/2/2007 4:02:34 AM   
Krener


 

Posts: 213
Joined: 11/5/2006
From: AS, AUSTRALIA
Status: offline 		Would you be looking at any weight saving by making holes in the control surfaces and horiz stab?

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RE: Herr Pitts Special Kit Build Thread - 11/2/2007 6:23:53 AM   
somegeek



Posts: 2118
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline
quote:

ORIGINAL: Krener

Would you be looking at any weight saving by making holes in the control surfaces and horiz stab?


Unless you're going for a super-light build, the weight savings would be negligible.

somegeek

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Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

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       Post #: 62

RE: Herr Pitts Special Kit Build Thread - 11/3/2007 7:17:09 AM   
somegeek



Posts: 2118
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline 		Got the TE sheeting and wing tips in place. Sanding the wing tip joint surface slightly to angle it yeilded a better joint I think. Propped up 1/4" with some scrap.



The instructions state to crack the spar to angle it but I made a small groove about 3/4 through the spar and filled with glue before gluing in place. Cleaner result I thought. Someone correct me if this was not the best way for this.



Got the top and leading edge spars in place...



Took some work to make sure the Titebond got into the rib grooves where the spars sit. The spars scrape down the sides of the groove when you insert them. With some of them, I slightly bent the ribs back and forth a little to work the glue into the groove to assure a good solid joint.

somegeek

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Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

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       Post #: 63

RE: Herr Pitts Special Kit Build Thread - 11/5/2007 4:11:28 AM   
somegeek