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Old Sep 09, 2013, 02:06 PM
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Castle Rock, Washington
Joined Jul 2002
178 Posts
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Jhh f-4

I got a Jet Hanger Hobbies F-4 in a trade, from notes on the instructions it had been built in 1999 but never finished. I installed a DynEmax, CC HV160 and powered it with 12 cells. It weighs 15 lb 6 oz. I flew it this Sunday for the first time, I like the way it flies and sounds. I have a few issues with the nose gear and gear doors, but nothing real serious. Here is a short video of the first flight.

F-4 9-8-2013 (2 min 24 sec)
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Old Sep 09, 2013, 02:11 PM
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A10pilot's Avatar
United States, TX, Schertz
Joined Mar 2006
1,529 Posts
Cobra:

Plane looks good. Nice job flying.

Ed
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Old Sep 09, 2013, 03:39 PM
EDF all the way!
bruff's Avatar
Gilbert, Az
Joined Jun 1999
8,020 Posts
Very nice!
Bob
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Old Sep 09, 2013, 06:42 PM
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Low Show's Avatar
United States, NC, Wilmington
Joined Jul 2004
301 Posts
Looking good on all accounts, got the juices flowing to get cranking on my Yellow. I did miss the lens cap not banging on the mic though, could you edit that in. Thanks....Don
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Old Sep 09, 2013, 07:37 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
22,743 Posts
Man...thats a great looking model!!! Id love to build one...thats my next jhh build
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Old Sep 09, 2013, 10:35 PM
Registered User
Oshkosh, WI
Joined Nov 2002
2,483 Posts
Great job completing the model, Cobra! The Dyn-E-max sounded good too.

I did one back in 2005; only thing available then was cramming 2 90mm Midi fans in. Flew okay @ 3.25 kw total. I hav another one NIB in the basement waiting for for its place in my queue. I've also got a Dynamax that I will convert.

How much building did you have to complete your F-4?

Phil
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Old Sep 10, 2013, 01:11 AM
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Castle Rock, Washington
Joined Jul 2002
178 Posts
Build

PhilLin, It was painted but shows some wear and tear, I plan on refinishing it this winter. I had to install the radio, none had ever been installed, mount the fan and exhaust duct, make a new cover for the engine area. Plumb the retracts, they work fine and will hold pressure for days, that sure surprised me.

Low Show, I have a Yellow also, about half done and a Dynamax with the conversion kit for it also.

I got the wheel problem on the nose gear fixed today, next is changing the 5/32 wire at the top of the strut to 3/16" and it will be about ready to try again.

Thanks for the nice comments, I was sure nervous until it got back on the ground.

Alan
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Old Sep 10, 2013, 01:25 AM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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Quote:
Originally Posted by corsair nut View Post
Man...thats a great looking model!!! Id love to build one...thats my next jhh build
i just happen to know where there is one ,that needs building ....at least i think i know where it is
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Old Sep 10, 2013, 03:51 AM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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does it have flaps ? seemed to land pretty good for your weight ,what size batts are you using and where are they located?
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Old Sep 10, 2013, 10:47 AM
Registered User
Castle Rock, Washington
Joined Jul 2002
178 Posts
Flaps

Air Sally, yes it has flaps, but I did not use them for landing as when I tried them in the air I had a trim issue. It turned out I had one offset from the other. I am using Gens Ace 5300 mah 30C batteries, they were just barely warm after the flight and took 3600 mah when I charged them. Two battery packs are just below the fan unit, mounted to the wing and the third one is between the inlet ducts.

Alan
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Old Sep 10, 2013, 11:03 AM
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JetMang's Avatar
San Diego, California, United States
Joined Feb 2002
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Nice Alan! Thanks for posting it. Our F-4 is my next planned competition airframe. I've been contemplating twin 90s, but thinking the single will just overall be simpler.


Chris
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Old Sep 10, 2013, 11:04 AM
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Oshkosh, WI
Joined Nov 2002
2,483 Posts
@Cobra, you just tweaked my memory to remind you of the incident I had with the 5/32 OD steel elevator axle, which I had to replace with 3/16 wire. I posted my testing of this need in my build/discussion thread. Perhaps it was the higher speed from EDF that made this a requirement, but was okay as GDF?

Cheers,

Phil
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Old Sep 10, 2013, 12:08 PM
EDF Jet Jam 2015, May 28-31st
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
6,695 Posts
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Originally Posted by JetMang View Post
Nice Alan! Thanks for posting it. Our F-4 is my next planned competition airframe. I've been contemplating twin 90s, but thinking the single will just overall be simpler.


Chris

Come on Chris, do ducting for JF80's and I'm there!
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Old Sep 10, 2013, 01:04 PM
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Low Show's Avatar
United States, NC, Wilmington
Joined Jul 2004
301 Posts
Everything is better in pairs, I had a Hobby Lobby Executive Jet Twin Ducted Fan Jet and for some reason when I slowly advanced the throttle #1 would start spooling, advance the stick a little more #2 came on line, on shut down same thing, #2 then #1 it was just too cool. Hope to replicate on the Yellow and headed that way with Roberts nudging. Maybe an 8s5000, I need to mock it up and do a little Weight & Balance interpolation guesstimations.....Don
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Old Sep 11, 2013, 11:44 AM
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Omaha, NE
Joined Jun 2004
227 Posts
Jhh f-4

Cobra, nice job! I hope to see more videos of your plane.
We need to see more of these F-4's built and flown. I can't resist showing this photo I found of Phil's while searching RCG. Jim
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