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Old Nov 06, 2012, 08:14 AM
Formerly "Heli Copter"
Jetsom's Avatar
United States, CA, Watsonville
Joined Apr 2009
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Quote:
Originally Posted by jayb1rdz View Post
I had my first full speed taxi runs on a paved runway. No take-off.... the Habu squirreled like crazy. I have steering on a seperate channel and reduced throws to minimum mechanically and I have the Cg at 112 mm from the LE.

Tracking seems much easier off grass !
Try some Toe-in on the main gear. My EDF's are all over the place without toe-in.
You'll probably find that you currently have some toe-out which will make it go all over.
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Old Nov 06, 2012, 08:40 AM
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United States, FL, Pembroke Pines
Joined Aug 2008
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Quote:
Originally Posted by kchen95 View Post
Tks again. Would you be willing to show me a picture of what you meant by a servo extension with the red wired removed and connected to the ESC lead? I just wanna make sure I do this correctly! Tks again and sorry for all the stupid questions

Kevin
Here you go, notice the cut is not on the ESC lead but instead on a short "lead saver" extension. There is no power flowing through this so you can use small gauge or thick gauge wire, it doesn't matter, my short extensions happen to be thin.

Regards,

- Birger
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Old Nov 06, 2012, 10:02 AM
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United States, MA, Holliston
Joined Aug 2008
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Quote:
Originally Posted by jayb1rdz View Post
I had my first full speed taxi runs on a paved runway. No take-off.... the Habu squirreled like crazy. I have steering on a seperate channel and reduced throws to minimum mechanically and I have the Cg at 112 mm from the LE.

Tracking seems much easier off grass !
If you're using the supplied fixed gear, make sure you have the gear legs on the correct sides with the wire struts on the outside facing in. If you get them on the wrong side you will end up with the wheels toed out and the plane won't roll smoothly even on pavement.
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Old Nov 06, 2012, 10:13 AM
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United States, MA, Holliston
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Originally Posted by kchen95 View Post
Ok good to know - tks! But you still would go with an external BEC? Is there a kind that I can install without having to cut wires/etc.? Or is an RX battery easier?

Tks again!

Kevin
No need to cut wires. If you don't want to add an extension you can, using a #11 Exacto blade, gently lift the tab on the servo connector and slide the red wire out of the connector. Fold the red wire back and using some electrical tape, tape it to the servo lead to keep it from shorting out. In the future, if you want to use the ESC's internal BEC, simply remove the electrical tape and slide the red wire back into the servo connector.
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Old Nov 06, 2012, 10:19 AM
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United States, FL, Pembroke Pines
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Quote:
Originally Posted by wfield0455 View Post
No need to cut wires. If you don't want to add an extension you can, using a #11 Exacto blade, gently lift the tab on the servo connector and slide the red wire out of the connector. Fold the red wire back and using some electrical tape, tape it to the servo lead to keep it from shorting out. In the future, if you want to use the ESC's internal BEC, simply remove the electrical tape and slide the red wire back into the servo connector.
I used to do that until I read in some thread somewhere (can't remember exactly where) that this could potentially loose up to 1/3 of the connectors holding power as you now only two pins instead of 3 (assuming the plug itself in the receiver doesn't provide any or minimal holding power). Now I have no personal experience with plugs coming out but you never know, it could happen.

Anyway, I am just passing it on as a comment someone made, let the reader make a decision as to whether or not they put any weight on the comment or not.

Regards,

- Birger
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Old Nov 06, 2012, 10:39 AM
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Taiwan, 北市
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Tks Birger, Josh and others - extremely helpful!

So, to use an RX battery, there are essentially two steps:

1) Plug the battery into the battery/bind port of the RX
2) disconnect the internal BEC by removing the red wire on either the ESC itself or the servo extension connecting the ESC to the RX

And, if I use an RX battery, it's safe not to install an external ESC.

Do I finally have all this right?

Kevin
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Old Nov 06, 2012, 11:12 AM
Never fly an A model anything!
jayb1rdz's Avatar
Antarctica
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Thanks Heli and Wfiield, struts are stock and fitted the right way.... Gear doors are firmly attached. Steering linkages all pretty much slop free. I do have a touch of toe in which I put in to help slow down on landing. The way it rollls, maybe it could do with a little more.

Maybe the main struts have turned a touch. I'll double check.

I could have taken off by lifting the nose a little and using rudder but I was concerned about it spearing off to the side on landing once the rudder started to lose authority
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Old Nov 06, 2012, 12:41 PM
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United States, MA, Holliston
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Quote:
Originally Posted by bdelapen View Post
I used to do that until I read in some thread somewhere (can't remember exactly where) that this could potentially loose up to 1/3 of the connectors holding power as you now only two pins instead of 3 (assuming the plug itself in the receiver doesn't provide any or minimal holding power). Now I have no personal experience with plugs coming out but you never know, it could happen.

Anyway, I am just passing it on as a comment someone made, let the reader make a decision as to whether or not they put any weight on the comment or not.

Regards,

- Birger
Yes, removing a pin may reduce how well the connector stays put. Of course, there are many ways to deal with such issues, including tie wraps, a dab of some easily removed adhesive such as GE Silicone or ZAP Goo, etc. The bottom line, I've had BEC connectors with only 2 pins fit very tight and also some with all 3 pins fit rather loosely. It's up to the modeller to ensure that all their electrical connections are sound and won't come undone in flight.
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Old Nov 06, 2012, 01:59 PM
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NY, Rochester
Joined Oct 2003
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Quote:
Originally Posted by jayb1rdz View Post
I had my first full speed taxi runs on a paved runway. No take-off.... the Habu squirreled like crazy. I have steering on a seperate channel and reduced throws to minimum mechanically and I have the Cg at 112 mm from the LE.

Tracking seems much easier off grass !
Try toe in (as mentioned above).
I hold some elevator to prevent the nose wheel from over-correcting (this happens because the plane is very light on the nose wheel).
Chris
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Old Nov 06, 2012, 02:14 PM
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United States, CT, Southbury
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Main gear toe in is the key.


Quote:
Originally Posted by jayb1rdz View Post
I had my first full speed taxi runs on a paved runway. No take-off.... the Habu squirreled like crazy. I have steering on a seperate channel and reduced throws to minimum mechanically and I have the Cg at 112 mm from the LE.

Tracking seems much easier off grass !
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Old Nov 06, 2012, 07:57 PM
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Im in....
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Old Nov 07, 2012, 06:20 AM
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Portugal, Porto District, Maia Municipality
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How do you apply toe in? To you bend the struts at wheel level? Do you modify the angle of the slot in the strut where it's tightened?
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Old Nov 07, 2012, 07:57 AM
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United States, CT, Southbury
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I have the tam strut upgrade and I just positioned the struts with a slight toe in, marked the position, removed them from the trunnion and then dremeled a flat area for the grub screw on the pin that is inserted into the trunnion at the new position. The reinserted, put the grub screws in and loctited them.

Worked for me....hope this helps.

Quote:
Originally Posted by whisperdancer View Post
How do you apply toe in? To you bend the struts at wheel level? Do you modify the angle of the slot in the strut where it's tightened?
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Old Nov 07, 2012, 09:17 AM
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United States, MO, Warrensburg
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Also I would consider adding some expo (if its a futaba radio) or dialing in some negative expo (if you run JR, or most others), to help nulify the center position and prevent you from over controlling on the takeoff roll. I also have found that a 1/3 - 1/2 throttle acceleration for about the first 50-100 feet (then go full power for the remaining takeoff) gives the jet time to stabilize and the rudder to become effective and overall help alignment on the takeoff roll.

....on a seperate note. I have been flying my Habu 2-4 times a week and the more I fly it, the more amazed at how excellent this jet really flies. I am running all stock gear on 6s and just grin everytime I fly. The vertical is great, the stability is great, the tracking is on rails, and the landings are predictable. It really is one of the finest EDF jets out there. If I had to give up all my models except for one, this would be it. I know many guys upgrade their Habu's to better power packages and bigger batts (for various reasons of course...runway conditions, high altittude, etc.), but for me I dont think I would change a thing on this one (unless I get experiemental!). Its perfect in every way.
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Old Nov 07, 2012, 12:40 PM
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Joined Dec 2011
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Habu 32 maiden

Hi again yesterday I maiden my habu i was super scared but everithing went
Good i fly it 2 times and here is the video of the maiden after 5:30 fligth the lipos still have 39%. I land it without any flaps and was to fast to land next time i will try to use flaps. Please watch the video and tell me what you think. Any tips


My set up jet fan 80mm, typhoon 700-60-1738. Ice 100, pro Bec

Habu 32 Maiden (5 min 32 sec)
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