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The uVROs (Unbridled Vying Radical Objects) are the VRO's rocket motor propelled build-it-yourself flying saucers. uVRO I and II are ideal for backyard flying since they fly up to only 15 to 25 meters with B4-2 respectively C6-3 motors (performance similar to Quest's Area 51 Flying Saucer). The use of A-motors or longer delays should be avoided since they tend to ignite the ejection charge to close to the ground. Actually, you can use plugged motors without delay or an ejection charge since there is no parachute.
 µVRO I
The
uVRO I can be built with readily available materials. For the saucer
ring you can use 1mm thick modelling plywood, or you can make your own
very light plywood out of two layers of 1 mm thick balsa sheet. If
available, extruded polystyrene sheet like Depron or Climaplan is even
easier to work with (but do use suitable glue or use double-sided tape).
 µVRO - Parts View
Tip
1: the uVROs are not very weight critical, so you can use quite a heavy
gage motor mount tube. Use tape wrapped around the motor to to make a
friction fit.
Tip 2: for a launch lug you can use a piece of plastic
tubing as sold to mount air inflated balloons upon. Use superglue to
stick to cardboard or wood.
uVRO
II is even simpler to build, but you need to obtain a soup bowl made (Æ
17cm) out of expanded polystyrene, out of which you cut the bottom.
 µVRO II
Tip 3: use bent scissors (e.g. nail scissors) to cut the bottom of the soup bowl
Tip
4: to glue the balsa supports to the expanded polystyrene, use hot melt
glue. It really works very well. The expanded polystyrene does allow
quite a lot of hot melt glue to be used, although there is a limit of
course.
uVRO
III is the higher performance version of the uVRO II, made by cutting
the outer edges of the soup bowl. If in addition you use a slow burning
motor like the German HELD 1000 (a cheap kind of C2-0), you can reach
altitudes of about 50m.
 µVRO III
Yvon Masyn, May 27th, 2002
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