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Old May 30, 2012, 08:10 AM
Hey Ya'll!! Watch THIS!!
Michael Paxton's Avatar
Nashville TN.
Joined Mar 2006
2,555 Posts
Quote:
Originally Posted by Knife Liddle View Post
Shhhhhhsh, man, you woke me up

besides you misspelled cwaftsmen
Cwap!
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Old May 30, 2012, 09:19 AM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
22,229 Posts
sorry i forgot to get back to you, yes, a 1.5y. but im also using the HET 1500kv in my other jetfan at about the same amps, and maybe even a little better performance in my het F-20



Quote:
Originally Posted by heliclown View Post
PS
Read the post suggested, and noticed it was a 1415 1.5Y, not a 2Y. the difference in kv is 1500 to 1100.Can you confirm which motor used is correct?
Thanks Mate, i am about to order motor tomorrow
Steve
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Old May 30, 2012, 07:30 PM
"My grandma wants to fly jets"
heychas's Avatar
Richmond, VA
Joined Feb 2008
475 Posts
I noticed on the EJF website they recommend their 1680kv motor with their fan for 8s. Similarly, the Arc 36-75-1 is 1680kv and it gets between 2.5 to 2.75w on 8s with both the wemo and 9305 fans. Perhaps as KL said, the 1500kv is only good for Jetfan.
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Old May 30, 2012, 10:11 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
20,856 Posts
im sure the 1680 would work too .but then you'd need a 100 esc ,and flights would be shorter.the 1500 gives lower amps (80-85) and longer flight.seems to be a happy system ...think i could even use 4000 batts for a lighter airframe.
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Old May 30, 2012, 10:20 PM
Registered User
spyda00's Avatar
Australia
Joined Jun 2009
1,058 Posts
are there any more photos of this baby floating around?
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Old May 30, 2012, 10:29 PM
Lee Liddle
Knife Liddle's Avatar
Carrollton, Tx
Joined Dec 2006
8,128 Posts
Quote:
Originally Posted by heychas View Post
I noticed on the EJF website they recommend their 1680kv motor with their fan for 8s. Similarly, the Arc 36-75-1 is 1680kv and it gets between 2.5 to 2.75w on 8s with both the wemo and 9305 fans. Perhaps as KL said, the 1500kv is only good for Jetfan.
If you like the performance of Brent`s XL, I`d say go with the 1500kv. Nothing like duplicating a proven system to get exactly what you want, and you could always add a cell for a little extra kick when you want it.
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Old May 30, 2012, 11:26 PM
wannabe Jet guy
CRCJA's Avatar
Green Valley, AZ
Joined Aug 2004
1,979 Posts
Blades

It also has a lot to do with the pitch of the blades and the number of blades.

BTW. I am in search of a JetFan 90 if anyone has one they like to part with.

Ralph

Quote:
Originally Posted by heychas View Post
I noticed on the EJF website they recommend their 1680kv motor with their fan for 8s. Similarly, the Arc 36-75-1 is 1680kv and it gets between 2.5 to 2.75w on 8s with both the wemo and 9305 fans. Perhaps as KL said, the 1500kv is only good for Jetfan.
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Old May 30, 2012, 11:48 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
20,856 Posts
Ralph try pm'ing Mike Warren. 2 performance edf. or pm Rainer
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Old May 31, 2012, 04:45 AM
Registered User
Australia, NSW, Hillsborough
Joined Feb 2008
92 Posts
1500 kv

Thanks fellas, for your input, i have decided to go with the 1500kv HET 700-68 motor, with Jetfan 90 on 8S, like Corsairnut.( I like the idea of longer flights and lower amps.
Steve
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Old May 31, 2012, 09:36 AM
Registered User
Brazil, RJ, Rio de Janeiro
Joined Oct 2006
82 Posts
Hi guys,
I got very interest in this jet, but reading this post and the EJF building manual, saw many building tips and attentions points that are not difficult to solve using some quality materials and careful build.

The only thing that got real concern was the elevator stab flutter. And my idea is always use the simplest solution, removing the elevator moving part and replacing with a strait one. This way we have vey little change in the look and finishing with the difference between the center and the tip. A peace of trailing edge balsa glassed and painted is the easiest way to solve the problem.

Also I am thinking about using the HET 700-68 1500KV on Hyperion 4200 10S 45C batteries. What you suggestions about this setup?

Oliver
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Old May 31, 2012, 09:46 AM
EDF Jet Jam May 2014
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
6,534 Posts
It seems to me the elevator tapers at middle to allow enough up elevator travel!
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Old May 31, 2012, 09:51 AM
Registered User
Tumbler's Avatar
New Jersey
Joined Feb 2003
8,018 Posts
or they just drew out a stab shape with a double taper that looked cool and then said oh crap, how do we make this work with one servo......oh I know lets make the hinge line straight across.

Quote:
Originally Posted by Robert Belluomini View Post
It seems to me the elevator tapers at middle to allow enough up elevator travel!
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Old May 31, 2012, 10:04 AM
Lee Liddle
Knife Liddle's Avatar
Carrollton, Tx
Joined Dec 2006
8,128 Posts
I think it's some of both. On the smaller S90 there is a clearance issue on up elevator.
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Old May 31, 2012, 11:27 AM
Registered User
Brazil, RJ, Rio de Janeiro
Joined Oct 2006
82 Posts
Looking at this picture elevator travel won’t be a problem., the elevator extension will be after the exhaust, and as there will be more surface, less throw will be need.
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Old May 31, 2012, 11:58 AM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
20,856 Posts
if the elev trailing edge moves up into the efflux from the tail pipe you will have vectored thrust ,.....can you say touchy Elev.
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