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Building Tips and technical articles. => Building techniques => Topic started by: Leester on January 03, 2007, 06:08:47 AM

Title: Billy's Junar
Post by: Leester on January 03, 2007, 06:08:47 AM: I just received the plans to Billy's Junar, It shows 3/16" sq "False Ribs" are these just pieces of stick glued to the spar ? are they shaped ? Also the plans are for a piped 40 (OSVF) what would be the size range for non piped engines, any prefered non piped engines ? Any pics of a finished Junar would be cool. Thanks
Action Lazer (in vendors corner) has the short kit for 47.47 I think the price is correct.
Title: Re: Billy's Junar
Post by: Randy Powell on January 03, 2007, 03:55:28 PM: I've got the plans, but don't have them in front of me right now. Could you give more of a description of what you are asking on the 3/16" Is this bracing for the gear or do they look like ribs?

An OS40VF (or similar) on a pipe would be fine. The plane has to be kept light (52-55oz range) and for this weight, a piped 40 is fine. For a non-piped engine for this plane, I'd think about an ST51 or similar. If the cash is available, I'd think about a PA or RO-Jett 51 or 61 on a muffler. Or maybe a Stalker 61RE or similar. Depends on what you have and what you are comfortable with, but on a muffler, I wouldn't consider anything smaller than a 51.
Title: Re: Billy's Junar
Post by: Leester on January 03, 2007, 04:52:04 PM: Randy: They are between each rib and only shown on the top view so they look like stick 1 1/16 out from the sheeting.
Title: Re: Billy's Junar
Post by: Bill Little on January 03, 2007, 05:29:13 PM: Hi Lee,

They are to simulate the "half ribs" of the I-Beamer and maintain the LE airfoil. Fit them between the LE and spar as shown and sand them to match the regular ribs. I haven't looked at the plans in a while, but I did spend a LOT of time looking at them when the plane was first built.

I built his "little" Junar which was an inlline design and smaller with a D-tube wing.

Since the published Junar (especially his "White" one) had a pretty much unmodified USA-1 wing, I had planned on building mine with the USA-1 I-Beam wing. But I built the *little* one instead.

Bill <><
Title: Re: Billy's Junar
Post by: Leester on January 03, 2007, 05:45:45 PM: Bill: They don't show them between the LE and spar just from the spar into the open bay.
Title: Re: Billy's Junar
Post by: Bill Little on January 03, 2007, 11:37:47 PM: My bad! I haven't looked at those in years, and I should have before I opened my rather large mouth! **) Like I said, I didn't pay any attention to them because I was going to build it as an I-Beamer. I really have no clue on them, now.....

Sorry!
Bill <><
Title: Re: Billy's Junar
Post by: Randy Powell on January 04, 2007, 06:51:51 PM: What, to maybe simulate half ribs? I can't imagine Billy putting some non-esential item. From the picture, it doesn't look like they extend under the sheeting which is pretty weird. If they did, I'd just say half ribs. I use that technique to maintain the airfoil under the sheeting.
Title: Re: Billy's Junar
Post by: Wayne J. Buran on January 05, 2007, 04:29:12 AM: From what I can see from your attached print copy, it looks like they left off the dotted lines that would show the half ribs that help to support the upper and lower sheeting. I assume that there is sheeting or at least thata what it looks like from here.
Wayne Buran
Title: Re: Billy's Junar
Post by: Leester on January 05, 2007, 01:13:33 PM: maybe this is a better shot of the plans. Note there is NO slot in the spar for them either.
Title: Re: Billy's Junar
Post by: RC Storick on January 05, 2007, 08:37:59 PM: I have those planes too. If I were going to build it I would leave them off.
Title: Re: Billy's Junar
Post by: Bill Little on January 05, 2007, 08:40:17 PM: Quote from: Robert Storick on January 05, 2007, 08:37:59 PM
I have those planes too. If I were going to build it I would leave them off.

Exactly. y1