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Building Tips and technical articles. => 1/2 A building. => Topic started by: Larry Renger on April 12, 2010, 10:01:40 PM

Title: Potential for singing soprano! Yipe!!!
Post by: Larry Renger on April 12, 2010, 10:01:40 PM

I had glued the firewall onto the Blackhawk Bullet with CA adhesive.  It turns out to be a disaster!  On the second flight the engine tore the firewall off the model with the engine running and headed for a very sensitive part of my anatomy!  Fortunately, the fuel hose stayed attached and the engine ended up eating the wing, not me.   ~^

The wing is under repair, and the firewall is now bonded with 30 min. epoxy and a few extra supports!

Overall, though, we are getting a handle on what kind of setup is needed for Qwikee Stunt.  It is a "Big Grin" event when it is working, I assure you.  Antone Kephart showed up with a Baby Magician with a sheet wing and AP Wasp power, and it is flying just fine.  I have the Blacksheep Bullet with a Holland Hornet and a SIG 1/2A Skyray with an Atwood Shriek.  All of them will do the full pattern.  It is going to be an interesting contest when we hold it!!   y1

Title: Re: Potential for singing soprano! Yipe!!!
Post by: LARRY RICE on April 13, 2010, 09:21:55 AM

Why do I even bother to write directions?
Larry
BHM

Title: Re: Potential for singing soprano! Yipe!!!
Post by: john e. holliday on April 15, 2010, 05:34:52 PM

Don't we read directions only after something doesn't work. LL~ LL~ LL~ LL~ LL~ H^^

Title: Re: Potential for singing soprano! Yipe!!!
Post by: Larry Renger on April 16, 2010, 12:27:41 AM

Yeah, but by then I had thrown out the directions.   b1

Title: Re: Potential for singing soprano! Yipe!!!
Post by: Tim Wescott on April 16, 2010, 12:25:31 PM

Quote from: LARRY RICE on April 13, 2010, 09:21:55 AM

Why do I even bother to write directions?

I'm confused.  How can I ignore the directions when they're not there?

Title: Re: Potential for singing soprano! Yipe!!!
Post by: Paul Smith on April 16, 2010, 06:39:15 PM

The firewall coming unglued was traditional on Scientific hollow logs.  It's good that Black Hawk has carried that tradition onward.

After an initial hard way education we would beef up the front end with some sort of cloth; linen hinges, silk, nylon, or whatever we had.  

I can recall field repairs where the firewall was reglued with Testors or Ambroid and an Allen wrench or piece of piano wire was driven through the fuselage to provide anchor points for rubber banding the engine on.  The plane was then flown with the glue wet and it remainded that way for the remainder of its life.

Title: Re: Potential for singing soprano! Yipe!!!
Post by: minnesotamodeler on April 23, 2010, 06:31:54 AM

Drill a coupla holes and glue in 1/8" wood dowels through the firewall and balsa behind.  You'll never lose another firewall.