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This thread is privately moderated by Herb, who may elect to delete unwanted replies.
Jun 07, 2012, 11:09 AM
Lithium Member
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The thick lid on the ESC hole in the fuse bottom reduced the fan noise quite a bit ... that big hole was indeed acting like a resonant cavity

I used Doppler to estimate the speed on the old video and it came at around 106 mph level upwind (in ca. 13 mph headwind).

.
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Jun 07, 2012, 11:24 AM
Hawk Fanatic
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Thats a pretty good speed. What cell count were you again? 10s? 8s?
Jun 08, 2012, 12:07 PM
Lithium Member
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I am at 9S but am thinking of dropping down to 8S to reduce the power

The Hawk is well suited for slow gentle aerobatics ....
Jun 10, 2012, 12:36 PM
Lithium Member
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Short video clip of landing

.

FlyFly Hawk 90mm edf landing (0 min 12 sec)
Jun 10, 2012, 07:48 PM
Hawk Fanatic
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Thats the way aha aha I like it aha aha, thats the way I like it.
Jun 13, 2012, 01:25 PM
Lithium Member
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I've had a few problems with the nosegear setup on my Hawk.

But then, the mains have worked very well so far with no issues, using the stock lightweight struts that came with the kit

The first problem was that I did not put in a tiny screw that prevents the steering servo mount from sliding off the retract mechanism block

That has been fixed now, but it required that I slide out completely the nosegear unit.

.
Last edited by Herb; Jun 13, 2012 at 01:32 PM.
Jun 13, 2012, 01:31 PM
Lithium Member
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The second issue with the nosegear is that a stop built into the retract unit to prevent the strut from bending back too far is not strong enough (it breaks).

I first solved the problem with some foam that got immediately torn off on takeoff (the takeoff seems to put the most stress on my nosegear). That foam got torn off too.

So now I have a massive balsa block stop that prevents the strut from bending back on takeoff

On another unit the chip was loose in the control unit, but that's another story.
.
Jun 18, 2012, 05:47 PM
Hawk Fanatic
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How did you install the CS Shroud so that you could get it out again?
Jun 19, 2012, 02:27 PM
Lithium Member
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Mine had all the blades glued in with Hysol, then precisely re-balanced on a very sensitive magnetic balancer, and tested before installation.

The motor (HET 650) is quality and should last several years ...

I was not planning on taking the EDF unit out anytime soon, it is mounted very securely to reduce vibrations and resonance.

It won't come out easily, some foam would have to be cut, and the mylar exhaust is a problem too.

Generally for foam EDF jets this seems the normal situation, if it's well mounted then it won't come out easily

On composite edfs it's a completely different story. Low cost foam EDFs tend to be "use and recycle" ...

I have EDF jets that have had their fans intsalled for four years (Rafale) and never a reason to take them out - except re-motoring or fod ingestion shredding blades.
Jun 19, 2012, 03:18 PM
Hawk Fanatic
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So in other words, short words, you didn't cut the shroud down for easy removal. Ok, thanks.
Jun 19, 2012, 05:41 PM
Lithium Member
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... with such a heavy rotor cutting the CS shroud made no sense. It needs that massive shroud to achieve some rigidity and avoid vibrations.

Sorry for explaining to you my reasoning
Jun 19, 2012, 06:00 PM
Hawk Fanatic
SkylineFlyer's Avatar
Quote:
Originally Posted by Herb
... with such a heavy rotor cutting the CS shroud made no sense. It needs that massive shroud to achieve some rigidity and avoid vibrations.

Sorry for explaining to you my reasoning
I'm just messing with you. C'mon man, anyone could see that.
Jun 20, 2012, 02:50 PM
Registered User

contact


Hi Herb how are you i need to contact you because i like to start to work in the same airplane, i live you my email so i hope so you can contact me.

israfly747@hotmail.com

Best regares

israel
Jun 20, 2012, 02:59 PM
Registered User

Quote


hi everyone , i like to start working on this jet so do you know about the quote aprox to this project.? $$$$$
Jun 21, 2012, 12:02 PM
Lithium Member
Herb's Avatar
Hi, maybe if you are a bit more specific it will be easier to help you

In any case, here is a semi-complete list of most / all the parts I used:

http://www.hobbypeople.net/index.php...ixed-gear.html (Hawk)

http://www.hobbywhere.com/index.php?...&product_id=53 (same one)

http://www.hobbyking.com/hobbyking/s...idProduct=9392 (TGY 90S servos x 5)

http://www.hobbyking.com/hobbyking/s...dProduct=16342 (or Corona digital)

http://www.hobbyking.com/hobbyking/s...dProduct=17206 (FASST comp. receiver)

http://www.hobbyking.com/hobbyking/s..._Gear_Set.html (landing gear mechanism)

http://www.hobbywhere.com/index.php?...&product_id=67 (same one)

http://www.hobbypeople.net/index.php...-1-main-2.html (strut set, twin wheel nosegear)

http://www.hobby88.com/shop/product_...ywdouohwhxfbla (same one)

http://www.hobbyking.com/hobbyking/s...dProduct=20696 (YEP 120A HV esc)

http://www.hobbyking.com/hobbyking/s...dProduct=20698 (YEP programming card)

http://www.hobbyking.com/hobbyking/s...dProduct=22070 (CS 12 bl fan)

http://www.highendrc.com/index_ecat.php?cPath=53_57 (HET 650 - 68 1350kv motor)

http://www.hobbyking.com/hobbyking/s...idProduct=3735 (hxt ubec)

http://www.hobbyking.com/hobbyking/s...idProduct=2038 (Voltmeter)

http://www.hobbyking.com/hobbyking/s...idProduct=7702 (edf rotor precision balancer)

http://www.hobbyking.com/hobbyking/s...idProduct=9921 (ubec jxt to 3S pack adapter)

http://www.hobbyking.com/hobbyking/s...idProduct=9682 (jst pigtail)

http://www.nitroplanes.com/98p-25c-3300-3s1p.html (GensAce 3300mAh 3S packs x 3 - to give 9S)

http://www.hobbyking.com/hobbyking/s...idProduct=9908 (misc items)

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