** Blu-Baby Primary Trainer ** Plans, Pics and Fun! - Page 994 - RC Groups
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Aug 08, 2010, 10:43 AM
AKA Don
I have come to like laminated "monoblocks" better anyway. They are much stronger.
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Aug 08, 2010, 11:12 AM
Registered User
philipa_240sx's Avatar
I now use my hot wire cutter for monoblocks. I'm planning to build a scroll saw version with a rip fence and mitre capabilities... just haven't had the time.

Otherwise, the easiest method I've found is a coping saw with a very fine toothed blade (28tpi or higher). Leave some excess then smooth with a sanding block and 220 grit paper.
Aug 08, 2010, 11:22 AM
Registered User
philipa_240sx's Avatar
Speaking of BB's, I'm planning a variant of the BB42. A 1/9th scale 1941 Taylorcraft BC12. Wingspan will be stretched a bit to 48".

Just starting the drawings now.
Last edited by philipa_240sx; Aug 08, 2010 at 11:35 AM.
Aug 08, 2010, 12:30 PM
Registered User
just wanted to report another successful BB maiden flight.
We had higher wind than I normally would have liked for a maiden, but since I knew the model I knew it wouldnt do anything funny.
Still on the first battery pack my friend managed take offs, landings, loops and general wind fighting.
mission accomplished: Another person addicted!
Aug 08, 2010, 04:38 PM
Mark Harrison
Quote:
Originally Posted by Hazydog
How did you cut the block?
I had great results with a straight-edge bread knife like this:

Aug 08, 2010, 07:19 PM
Registered User
Hazydog's Avatar
Thanks for the quick replies. I'll give the bread knife a try. Keep my eyes peeled for an electric craving knife too.
Aug 09, 2010, 08:52 PM
My middle name is Alton
AltonMan's Avatar
Hi guys, I have been a fan of the blu-baby for a couple of years now. I currently have a blu-baby 33 and a 42 with ailerons. I love this plane.

I have been working on a pusher prop plane that has monoblock construction similar to the blu-baby.

My most recent design changes I made to the Yeti (that's what I called it) include using the wing from the blu-baby 33.

I first made the fuselage for the Kfm3 Sport wing, and I just made and adapter to let me use the UC wing.
Aug 09, 2010, 08:52 PM
My middle name is Alton
AltonMan's Avatar
The Yeti - Version 2, Undercambered Wing (2 min 38 sec)
Aug 10, 2010, 01:33 PM
Registered User
I was repairing my 42" blu-baby today which involved gluing in the firewall... however, after the glue set I saw that the motor was pointed downward a bit... about 15 degrees or so from where I would normally put it. I've heard people say that shimming the thrust downward a bit helps, but is this too much? I'd rather not rip off the firewall again if I don't have to, and I have no idea what the thrust angle affects.
Aug 10, 2010, 02:11 PM
AKA Don
Any off axis of a motor will pull the nose of the plane in the direction of the offset when power is increased.

15 degrees sounds like way too much.

High wing, tractor, planes normally use some right thrust to offset the prop blast effect on the vertical stab and the roll effect of the motor torque reaction. They also commonly have some down thrust to balance the wings tendency to pull the nose up with increased speed. When the offsets are right the plane just accelerates forward and begins a shallow climb when power is increased. Like wise the plane maintains heading and just lowers the nose when power is removed. If the thrust angle is wrong the plane will pull right or left and up or down when the throttle setting is changed. You can fly it but it takes alot more stick motion to keep it headed in the desired direction.
Aug 10, 2010, 04:13 PM
Registered User
JohnsPop's Avatar
Hey TD, is your motor mounted so you can get some washers behind it? If the 15 degrees is too much, maybe you can put a few washers behind the lower mounts to help angle it back upwards a bit. Then maybe you won't have to pull the firewall completely back out.
Aug 10, 2010, 04:16 PM
Registered User
TheTrashMan's Avatar
is there any difference performance wise between the 2 different stabs you can use for the bb 33??
Aug 10, 2010, 04:16 PM
Registered User
JohnsPop's Avatar
Nice little plane there Alton! Looks kinda like a cross between the BB and Tony's Tuffy. Looks like she flies pretty good but maybe a little tail heavy with the up attitude it seems to have. Looks good though dude!
Aug 10, 2010, 04:52 PM
I hate gravity!!
schrockie's Avatar
Quote:
Originally Posted by planeflyer94
is there any difference performance wise between the 2 different stabs you can use for the bb 33??
nope, just what style you prefer, old-time or modern.

Troy
Aug 10, 2010, 06:48 PM
Not always grumpy!!
insomaniac45's Avatar
im gonna stick with the old time feel with mine, so im gonna paint it like a j3 cub
yellow lol


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