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Old Feb 12, 2009, 12:38 PM
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Quote:
Originally Posted by Thomas B
Even a very short thrust tube to neck down the aft end of the fan would help...I think you could do one that is 1"-1.5" long
I was under the impression that it was counter-productive to choke down the exhuast diameter too suddenly (over too short a distance), but I could well be wrong about that.
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Old Feb 12, 2009, 01:40 PM
United States, GA, Columbus
Joined Mar 2002
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Quote:
Originally Posted by Thomas B
As I recall, I think you will see a thrust increase and an amp draw decrease with a proper inlet lip. Also, without the lip, the fan will be prone to cavitation at moderate angles of attack, due to the sharp lip of the bare fan housing. If you do some searching around here, you will see the results of inlet lip tests.

The benefits of the inlet lip were described in one of your previous threads by seeveral people:

http://www.rcgroups.com/forums/showt...ight=inlet+lip

Adding a short thurst tube with a smaller exit area will increase efflux and also slightly increase amp draw.
Thanks, I do recall that thread. Normally on all my ducted fans I do use a thrust tube with the correct exit diameter. I hadn't really planned on using inlet lip or thrust tube on this plane (although beneficial) as no one was really using it on the small world models version. Maybe that plane was just so small and light that it really didn't need it.
Thanks for you input.


Flyboytha1, Will you be using inlet lip and thrust tube?

James
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Old Feb 12, 2009, 11:51 PM
Have you seen my nut?
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Omaha, Nebraska
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Hey guys. Been reading along as the thread builds. Looks like I might have my Extra 300 sold so I can get this bird. Can't wait to here a flight report. And find an answer to the CG Chinese Instructions Mystery.

I had the World Models Unijet and loved it for the 1 flight I had it. Note to self....range check every model before maiden.

So, anyone else reading along that is thinking of getting this plane, dont. Cause I dont have one yet and dont want to see...OUT OF STOCK!.
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Old Feb 13, 2009, 03:30 AM
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Jim I"ve Just Open Up The Box Everythings Looking Good Have Started Building It Yet But Will Have Video Updates Here Soon
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Old Feb 13, 2009, 08:59 AM
I'm a lead farmer Mother ^%$^%
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<-----Anxiously awaiting mailman to finish my darn plane for Sunday.
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Old Feb 13, 2009, 09:03 AM
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Quote:
Originally Posted by JIMinKENTUCKY
Thanks, I do recall that thread. Normally on all my ducted fans I do use a thrust tube with the correct exit diameter. I hadn't really planned on using inlet lip or thrust tube on this plane (although beneficial) as no one was really using it on the small world models version. Maybe that plane was just so small and light that it really didn't need it.
Thanks for you input.


Flyboytha1, Will you be using inlet lip and thrust tube?

James
I'm Unsure Yet Got One Video Done Working On Second One Now, Almost On The Electronic Now.
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Old Feb 13, 2009, 06:22 PM
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Here's Part 1 Build Video.

Nitro Planes 100mm Fan Trainer Build Part 1 (3 min 23 sec)
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Old Feb 13, 2009, 08:19 PM
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Would you have to modify anything to use a Midi fan?
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Old Feb 13, 2009, 10:35 PM
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A midifan should be able to fit with minimal mods. I would drill the holes for the Himaxx fan and then use a spacer between the fuse and the fan side and then a bolt down clamp type thing on the mounting fin to secure it.
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Old Feb 13, 2009, 11:08 PM
United States, GA, Columbus
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Canopy and interior.
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Old Feb 14, 2009, 05:15 AM
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Hey Jim,

Where did you get that nice hatch release at??
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Old Feb 14, 2009, 06:41 AM
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Cataula, Ga
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I can answer that one for him... Hobby City, Hobby King, what ever they are now. I have a bunch of them also. They are nice as long as you don't putt too much preasure on the release from the side. The plastic will break off. I've been using them for about 2 years now.


http://www.hobbycity.com/hobbycity/s...py_Lock_30x8mm
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Old Feb 14, 2009, 09:45 AM
United States, GA, Columbus
Joined Mar 2002
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Yes, they will break easy. I am going to clip the release handle to make it short so less risk of breaking it.

edit: too late I just broke it Oh well, I have another.

James
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Old Feb 14, 2009, 03:40 PM
United States, GA, Columbus
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Video
Static test run and taxi test.
http://www.rcgroups.com/forums/showt...7#post11584224


As mentioned the manual states 2 CoG. 50mm back from LE and 90mm back.
90mm back is too far. 50mm makes more sense.
The plane will balance at 50mm back with 2-3s 3300 packs but just barely. It could use a little more weight in the nose so 3s 3500's would be perfect up to about 3s 4000's in series.

James
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Old Feb 14, 2009, 03:56 PM
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Looking Good Over There My Man, Looking Good, I'm Just About To Install My Motor Here's Video Part 2 Of The Fan Trainer, I'm Running The Himaxx 96mm Set Up With A 6 Cell 3850 Thunderpower Lipo On This Bad Boy, These Are The Readings I Pulled Of My Watts Up Meter. Looks Pretty Quick

Nitro Planes 100mm Fan Trainer Build Part 2 (9 min 55 sec)
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