Thread Tools
Oct 07, 2002, 11:46 AM
Lithium Member
Herb's Avatar
Thread OP

Robbe Gnat does not fly!


This is the first installment in a new series, entitled "XXX does not fly!!!", with - as first featured model - a Robbe Gnat on the (more or less) stock setup.

Doug's Gnat, Kyosho fan with AP29L on 8 x (3$) CP 1700 cells (t-33 & f-16 stock setup), jeti 50 controller, ca. 260 Watts and about 38 oz rtf. Spray painted only with tamiya acrylic italian red from the spray can (foam safe).

Video here of the Gnat (31MB, 3 mins):

Gnat video


brushless Astro 05 Gnat video
Last edited by Herb; Feb 20, 2004 at 05:43 PM.
Sign up now
to remove ads between posts
Oct 07, 2002, 01:13 PM
SoCal, Year Round Flying!
bmiller's Avatar
You're too funny Herb!
I wish my jet flew as well!
btw Theres no link to the video?
Oct 07, 2002, 02:14 PM
Registered User
Oct 07, 2002, 05:30 PM
SJ
SJ
Registered User
SJ's Avatar
I just ordered one.....
I have tons of rc2400 cells lying around.
Could I use 8 of them in the gnat with the ky fan and ap29l-V motor?

And, will it be hand launchable ?
As I can see, it has the same wing area of the ky F-16, so it should handlaunch ? right ?

SJ.
Oct 07, 2002, 06:24 PM
SoCal, Year Round Flying!
bmiller's Avatar
Are they still available? I thought they were discontinued? I watched Doug fly this and it really performs! It handlauched very easily.
Oct 07, 2002, 06:59 PM
Registered User

Gnat


SJ

I would like to know where you ordered one from......
Oct 08, 2002, 01:47 AM
Caution:Makes sharp left turns
Troy's Avatar
Quote:
Originally posted by SJ
I just ordered one.....
I have tons of rc2400 cells lying around.
Could I use 8 of them in the gnat with the ky fan and ap29l-V motor?

And, will it be hand launchable ?
As I can see, it has the same wing area of the ky F-16, so it should handlaunch ? right ?

SJ.
Dougs was flown on 8-CP1700s so an 8 cell 2400 pack will add about 4oz. It should still handlaunch ok but will need a good throw. He used a Kyosho fan and the AP-29 motor so you are ready to go!
bmiller, I think it slowed down after I threw it
Oct 08, 2002, 06:33 AM
SJ
SJ
Registered User
SJ's Avatar
I guess they dont sell like hot cakes in Denmark......
So a few hobby stores stil have them in stock.


ordered mine from http://www.el-fly.dk/

but have also seen them here : http://www.hobby-world.dk/

and here... http://www.avionic.dk/
Oct 08, 2002, 11:54 AM
Lithium Member
Herb's Avatar
Thread OP
Quote:
Originally posted by SJ
... I have tons of rc2400 cells lying around.
Could I use 8 of them in the gnat with the ky fan and ap29l-V motor? ...

SJ.
No, the 8x2400's are too heavy to get the CG right. 8-9 CP1700 is the absolute max on this model, unless you like your batts to lie inside the intake duct.
Oct 08, 2002, 01:00 PM
Dude, where's My Plane?
JasonJ's Avatar
Quote:
Originally posted by Herb


No, the 8x2400's are too heavy to get the CG right. 8-9 CP1700 is the absolute max on this model, unless you like your batts to lie inside the intake duct.
Well Herb,,, remember this thread IS called Robbe knat dose NOT fly! So lets rethink our advice here. Of course, you could just not charge your CP 1700s or use a bad cell or two .
Oct 08, 2002, 02:05 PM
Lithium Member
Herb's Avatar
Thread OP
I'm the one that's responsible for getting Doug a brand new NIB Gnat for free . Because everybody says the Robbe Gnat don't fly ...

So I suggested the above power setup to Doug, and after a week of intense building (you know those sleepless nights thinking about how to sand the intakes, hourlong extenuating debates about which cyclovinylpolyurethanecyanoacrylates paints might be ultimately the lightest etc) he came to the field and tossed it into the air, and guess what?
Oct 08, 2002, 02:23 PM
Registered User
hi everyone,

iam new to edf and i was woundering if the set-up above would fly a KC F18 w/ a minifan insted of the ky. sorry kind of off the topic.

janssen
Oct 08, 2002, 02:41 PM
Dude, where's My Plane?
JasonJ's Avatar
Quote:
Originally posted by Herb
he came to the field and tossed it into the air, and guess what?
Lawn dart?
Salad shooter?
High speed bug blender?
Gravity test device?
ARF = ARC Almost ready to crash?
High price golf tee hole maker?
Worm burnner?
.
Good to here it did well on a stock type setup!
Its amazing to me how much all the little attention to detail adds up durring a build of a kit or from plans. Any time I catch my self deviating from the instructions and saying it will be ok because,,,,,,, I just stop and re-evaluate what im doing .
Oct 08, 2002, 02:42 PM
Caution:Makes sharp left turns
Troy's Avatar
Quote:
Originally posted by Herb
No, the 8x2400's are too heavy to get the CG right. 8-9 CP1700 is the absolute max on this model, unless you like your batts to lie inside the intake duct.
I didn't realize his 1700 pack was shoved all the way rearward, my bad!
Unless of course the fan unit can slide back a few inches, you would indeed be limited to the 4/5 sub C cells.
SJ, 550 Kroner is about $72US. That's not too bad for a plane that doesn't fly
Last edited by Troy; Oct 08, 2002 at 10:09 PM.
Oct 08, 2002, 02:45 PM
Purple power
gregg f's Avatar
Quote:
Originally posted by JANSSENM
hi everyone,

iam new to edf and i was woundering if the set-up above would fly a KC F18 w/ a minifan insted of the ky. sorry kind of off the topic.

janssen
yes, it will fly it. and with decent power. a good low dollar alternative to bl..........gregg


Quick Reply
Message:

Thread Tools