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July 17, 2005
Ok, work done thus far...note that this is recognizably a Flitzer roundtail, but should not be used as a reference for other builders...the massive-looking lower fin rib is drilled out underneath.
-VS
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July 21, 2005
FAQ: How many clamps do I need?
A: All of them.
-VS
August 19, 2005
Attached are pictures of my first ribs, and the tailplane thus far. Rib construction is a repetitious, degrading, dehumanizing activity which I will henceforth assign to BAA detainees. Also, a nice bit of CG work for your gratuitous enjoyment...not mine, unfortunately.
-VS
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March 23, 2006
Ok, some pix to prove that I have been up to something constructive lately. Here we see the complete set of ribs, the sheeted stabilizer/elevator, and a couple of the setups I have been using to profile the ribs.
-S
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May 24, 2007 - VW PSRU and the Z-21
From: Jim Danner
To: Flitzer-Builders@yahoogroups.com
Sent: Thursday, May 24, 2007 12:16 PM
Subject: Re: [Flitzer-Builders]VW PSRU and the Z-21
Is anyone considering a VW PSRU for the Z-21? The pictures and video on the Valley Engineering/Culver Props PSRU page are enticing, but I'm not sure it would even fit under the cowling. (Would probably require a huge blister to house that prop sprocket, which I'm sure Lynn would not appreciate.) Also, it raises the the prop centerline 5.5 (or 6.5--there are two figures on the site) so you may have to lower the engine? I'm certainly no engineer, so what other considerations are there for this particular arrangement on this particular plane (the z-21).
It's affordable, so it's certainly an option for my Z-21.
Jim
Hi, Jim,
Look on Blake's site for some more, but I intend to fit a PSRU, and have done some CAD to develop the idea.
This proposed setup omits the accessory section, and uses an entirely different engine mount, allowing the engine to be moved aft a few inches. A prop hub extension is used, preserving the basic bullet nose.
Keep in mind that CG issues must be addressed....the PSRU and larger, heavier prop will aggravate the forward CG issues of the design, thus the omission of the accessory section and rearward shift of the engine. Rough calculations suggest that this will work out okay, with battery mounting located as suits actual CG.
Starting will be by Bobka Zundapparat, charging by small slipstream-mounted generator. (Made from brushless electric model motor.)
WvS
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