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RZ-300 and Wemotec Mini-Fan
To: Matthew Orme
"Just some info. I installed a Razor 300 in the Wemotec Microfan. It did
take a few swipes with a rat tail file to elongate the mounting holes on the
EDF. It gives me about 20 % more run time, and 10% to 15% more thrust during
takeoff. I'd count this as a success. "
From: "Matthew Orme"
Is this in comparison with the stock Sp300?
To: Matthew Orme
Yes. We measured current draw at full power using an 8-cell pack, installed in
the EDF.
The Speed 300 yielded 9.4 amps. The Razor yielded 11.5. (The Speed 300 is
hi-performance, relative to other brushed's.)
Takeoff ROG on a dirt runway was about 85' with the Sp300, about 50' with the
Razor, with a steeper climbout.
The significance is in runtime - approaching 2 minutes more on the same pack
with the Razor. A 9 or 10 cell pack ought to give a real jump in performance
and/or duration, providing the EDF can take the stress. It's also nice to know
that the Razor can be used a lot maore at this rate without losing performance
as the Sp300 would.
Subject: RZ400 Follow-up
To: matthew@razormotors.com
From: tracy_petit@peoplesoft.com
Hi Matt, It's been awhile since we spoke (AMA 2003 in Pasadena).
Last time we had discussed your RZ400 and the challenges in mounting it. As I
told you, I made some rings out of thin plywood on my laser cutting system to
fit around the motor and into the MP-Jet gear box for a speed 280 motor. This
allowed perfect centering of the motor in the gearbox, obviously very
important.
The follow-up is to let you know the system works great! The
power plant replaced the stock motor in the GWS Zero. My little plane has
retracts, a brushless motor and all 4-control surfaces. People upon seeing it
for the first time dismiss it as some little foam park flyer. I taxi it out,
throttle it up and she's airborne in 10-feet. I've had to fiberglass the wings
and reinforce the wing nut area so the wing doesn't break apart or come off due
the extra power.
If anyone ever needs the conversion kit, I make 'em. It
includes the centering rings, a plywood firewall and the wing bolt reinforced
mount all laser cut. Once I land, the questions start and I refer them to your
web site. I hope you've gotten business out of it. If you ever feel like going
smaller, I'd love to put a brushless in my GWS Tiger Moth. I already make and
sell laser cut struts and a lower wing brace, so I'm ready if you ever make
something a bit smaller!
RZ-Micro-Heli
Greetings Matthew,
Thank you for the trial motor. I have it installed (pulled the hacker out) and
working great in my cp hornet with a Castle Creations Phoenix 10 bought about a
week ago. I have not had a chance to push the motor yet, but it just
"feels" better. Lighter and smoother. GREAT work! Looking forward to
many future orders.
Thank you, Sean sean@heliguys.com
RZ-400 in a TinyX video
From: "Troy" info@b-p-p.com
To: "'Matthew Orme'" matthew@razormotors.com
Subject: RE: Dealer Price
Hello Matthew, thought you might get a kick out of the video below. It's a
TinyX with your RZ400 In it. It has a 3:1 Thrust to weight ratio! The video is
pretty short as I had to do it all myself and ended up ditching most of the
video(flying & taping at the same time is tough!) but its still kinda cool.
I hope to have some better ones up soon showing what the Razors can really do!
Thanks again for creating such awesome little motors.
www.b-p-p.com/videos/tinyx3.wmv
-Troy
Exhila (A small 3D plane)
Original Message
From: David
To: Russ
Subject: Exhila
Hello to all- I'm really enjoying building Jason Shulman's Exhila! Initial
tests look like it will hover on 7 cells! I expect that it will jump again in
performance when I get a better prop. The real goal of course is to get it
flying on LiPoly cells, and I just need to build the pack to find out how that
will work. Tomorrow mornings test flight will be with a 7 cell 380 pack. I came
up with an engine mount which uses a Dubro "heavy duty" Futaba servo
arm. I did this because I was concerned about torque twisting up my wires, (if
I used only tie-wraps) so after looking at the 2mm screw mounts on the front of
the gearbox, I decided on this arrangement to allow flexible strength and
simplicity. The pushrods are also an experiment. I took .050 carbon fiber rod
and created a flexible point in it by touching the soldering iron to it. This
allows a flexible joint that eliminates any clevis's and the system also allows
the pushrod to anchor into the trailing edge, for max efficiency. The stand off
is just a piece of the same carbon rod, pressed into the control surface about
1/4 inch behind the hinge. It serves as a stand-off to create the pivot point
location. David
 Original Message
From: Jason
RE: Exhila
Hi David, Thank you for the update. That's the first one I've had. Please keep
me posted on what you find work or not. And that is a really interesting
pushrod system. Regards, Jason -----
Original Message
To: Jason Subject:
Re: Exhila
Jason, The pushrod system has not worked out, carbon doesn't flex for long
before fatiguing. Control throws on a model like this are just too much for
this idea. (The rudder failed on the first flight.) I have since beefed up all
of the joints with a small amount of Kevlar string, and some heat shrink
tubing. This gives me the peace of mind that the plane will survive when the
carbon gives out! Still the lightest possible control system and slop free! The
model hovers like a dream. I have found though that if you are too low when you
transition out of hover, I tend to pancake into the ground. Getting back to
flying speed with a major burst of power is necessary for the wings to support
the plane! I know this is a no-brainer, yet one that caught me off guard
because of how well the little ship hovers. Your Exhila has been well
photographed by the new "RC Flyer Magazine". They loved how it
hovered! I hung it in front of their photographer for a whole pack. First issue
should be in Aug/Sept of this year! Dave
Original Message
Subject: RE: Exhila
Dave, It sounds like you are having a bunch of fun with it. I'll keep my eyes
open for the new mag. If you have any pics please feel free to send them. I'd
like to start a customer picture section on the site. And I know about those
power bursts...I've dumped it a few times now myself...LOL. But only once have
I had to glue anything back together (including a couple of nose first drops
from about 5-8 feet). Thanks again for the update, Jason -----
Hey Bruno- Just keeping you up to speed on the fun I am having with the Exhila!
I have flown it with both the Hacker B-20 15L, and the Razor 2500A, and I like
the Razor motor better. Lighter wt, lower current. Dave -----
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