Muncie Prelim results

[Earl Haury]

Dean

Your belt drive comments may be spot on for the outrunners. I chatted about 
the exact same thing with several guys at the Nats. A belt system allows a 
wide choice of ratios to optimize motor output with prop choice. Another 
advantage might be offsetting the motor from behind the spinner to acquire 
better cooling air flow over the motor. The trick will be keeping the weight 
down.

Earl


----- Original Message ----- 
From: "Dean Pappas" <d.pappas at kodeos.com>
To: <discussion at nsrca.org>
Sent: Thursday, July 21, 2005 8:47 AM
Subject: RE: Muncie Prelim results


Yup,
It sure is interesting!
Dave called me late last evening, to tell me how things ended up, after the 
prelims.
Needless to say, I am pleased and proud. Then I told him to hang up and get 
some sleep!
GEOMETRY FIRST!
obviously, I am quite the cheerleader.

The observation that the hacker setups have more GO than the outrunners is 
likely due to their lower "proper" operating RPM, and the bigger diameter 
prop, That improves the prop efficiency, and low speed thrust.
The effective KV on a 6.7:1 Hacker is either 186 RPM/V or 173 RPM/V, 
depending on whether it's a 13 or 14-turn winding. The AXI and Orbit 25 are 
at 250 RPM/V. That's why they swing 19" diameters, rather than 22".
The best KV, so far, for an outrunner is the Cyclon 160, at 205. Maybe an 
outrunner with fewer turns, and a higher KV, like 350, can be combined with 
a 2:1 belt reduction. Belts are quiet, but useless at the shaft RPM of a 
hacker. This combo could negate the inrunners slight electrical efficiency 
advantage, and the huge prop efficiency advantage.


Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Jason
Sent: Wednesday, July 20, 2005 7:26 PM
To: discussion at nsrca.org
Subject: RE: Muncie Prelim results


Just guessing, but I put some of the motors used...

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Adam G
Sent: Wednesday, July 20, 2005 3:13 PM
To: discussion at nsrca.org
Subject: Muncie Prelim results


FAI
Don S   3983 YS
Dave L  3959 Webra?
Quique S  3957 Hacker
Andrew J  3947 Hacker
Chip H    3937 Hacker
Tony F    3935 Hacker/Neu?
Troy N   3916 YS
   cutoff
Pete C  3874 Hacker
Michael H  3801 YS
Chad N   3798 Plettenburg
Joey H   3744 Hacker?
James W  3734 ?
Daniel L  3699 Axi
Adam G    3687 Plettenburg
Earl H   3628 YS
Bryan H  3592 YS
Bill H  3570 ??
Eric H  3557 OS
Glen W  3534 YS
Mark A 3503
Ron B  3372
Frank K  3361
Lamar B  3202
Albert G (inc)
Stephen L (inc)
Dezso V (inc)
Kenny L 0
Trent B 0


Note that posting four 975's isn't enough to make the cut!

-Adam

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