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Old Mar 31, 2010, 09:39 PM
Fly it like you stole it..
Tram's Avatar
Florence, Al
Joined Oct 2000
29,298 Posts
Ok.. I'll try it stock and get with you..
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Old Apr 02, 2010, 05:32 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
12,975 Posts
OK guys back to my building board. Sorry for the slow progress but I have had lots of motor fan balance combos sold the past week and customers come first! But I am all caught up now on orders so back to the build!

Don
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Old Apr 02, 2010, 10:59 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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I have my fan and motor combo all mounted then I started to measure the outlet and holy crap! The outlet diameter is 2" That is 140% FSA outlet! No wonder the F86 is the reported worst flying of the bunch. I am not sure what I want to do now. To make the outlet correct a nip and tuck would require 1.65" of material to be removed at the outlet. That is huge! No way that can be done on this model. I am almost considering putting a 60mm fan into it. There is a ton of foam that can be cut out easily to make the fan fit. Not sure what to do now.......
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Old Apr 02, 2010, 11:47 PM
Fly it like you stole it..
Tram's Avatar
Florence, Al
Joined Oct 2000
29,298 Posts
Got to maiden mine today and while it's not a rocket ship, it seemed to fly very nicely.. I guess I aught to try one of the other ones to hear what all the hype is about.
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Old Apr 03, 2010, 01:16 AM
ex-noob
Lardog's Avatar
Sammamish, WA, USA
Joined Jan 2010
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Quote:
Originally Posted by The Don View Post
The outlet diameter is 2" That is 140% FSA outlet! No wonder the F86 is the reported worst flying of the bunch.
So for us EDF noobs, what does that mean? FSA? Is the outlet too big or too small and what is the effect of either?

Thanks
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Old Apr 03, 2010, 09:41 AM
Wonderfully Wicked
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Willoughby, Ohio
Joined Jan 2002
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Quote:
Originally Posted by Lardog View Post
So for us EDF noobs, what does that mean? FSA? Is the outlet too big or too small and what is the effect of either?

Thanks
It means the outlet is way too big. The outlet is even on the big side of a 60mm fan.
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Old Apr 03, 2010, 10:05 AM
Registered User
United States, GA, Snellville
Joined Nov 2005
852 Posts
Don, for a stock setup... would a nip and tuck of any amount help?
I got a beater f-86 at this point and would like to try it to see if it helps.

Also... is it normal for the area right after the fan unit to be so wide? I would think thats killing thrust also.
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Old Apr 03, 2010, 11:33 AM
Stick 'em up!
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USA, CA, La Mirada
Joined Feb 2005
135 Posts
Don, what about a thrust tube? I plan on installing one in my F-86, any suggestions for the exit diameter?
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Old Apr 03, 2010, 05:08 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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I am not sure why they have the expansion on the outlet. Makes no sense to me but I am doing a combination of nip and tuck and thrust tube. I took a few photos and will post shortly. For those using the cone layout program, I used 2.060" as the starting diameter and 1.476" as the exit diameter with a length of 7.50" then I will add a small centering ring much like I did on the SR-71 outlets.
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Old Apr 03, 2010, 10:42 PM
Wonderfully Wicked
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Willoughby, Ohio
Joined Jan 2002
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Got some work on F-86 today. Here is what I did to solve the oversized outlet issue. I first did a "nip and tuck" by removing a wedge about 3/4" total width (3/8" on each side). Then I glued it together. This brought the outlet down to about 1.8" diameter which is what is needed for a 60mm fan! Next I made up a thrust tube and once the fan was installed, put the thrust tube in. Look at the last photo to see how tiny the correct exhaust looks even after the nip and tuck.
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Old Apr 03, 2010, 11:50 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
21,610 Posts
cool don! you should nip and tuck the inlet too!
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Old Apr 04, 2010, 12:07 AM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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CN, I know you have run 100% and less on inlets but for most applications say 100 mph or less what is a good number? 120%

Don
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Old Apr 04, 2010, 07:54 AM
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Fairborn, OH
Joined Nov 2009
544 Posts
Quote:
Originally Posted by The Don View Post
Here are some more shots of the tube installation.
Don, I notice you installed the new fan and motor in the stock location. With reports of the F-86 being tail heavy, are you worried about getting the CG right or are you planning on heavier batteries solving that?
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Old Apr 04, 2010, 08:13 AM
Wonderfully Wicked
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Willoughby, Ohio
Joined Jan 2002
12,975 Posts
I am using a 4S 1800 lipo which is much heavier so we will see what happens.

Don
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