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GWS A4 Skyhawk

Old 04-02-2008, 03:35 AM
  #126  
USMC_VTOL_Mech
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Crap!I forgot all about this forum!
Fugitive bill
If you need help with the retract installation let me know...looks like Jason pretty much covered everything else
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Old 04-02-2008, 06:15 AM
  #127  
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Dang USMC you forgot about this one???:plol. Nice to see you back.

Jason
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Old 04-04-2008, 02:55 AM
  #128  
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Got my new 2W-20 in the mail and now installed in the 6904 and in the plane. Here is some info and man I am really surprised at the numbers I have to post.

AUW=39.8oz
Thrust=38.5oz after 10 seconds.
Current=51.6A after 10 seconds.
Watts=745W after 10 Seconds.

All I can say is WOW!!!!

Jason
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Old 04-04-2008, 03:46 PM
  #129  
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Jason
Remember the 2w-20 I picked up for the j-10 the other day?
Well I installed it in a hi-maxx fan unit (the one that comes in the twister)
I was getting 680 watts at 45 amps
Flew the j-10 4 times before I burned the castle 45 out
I was surprised it wasn't alot faster
That is probably why I burned the esc out...holding WOT for 5 minutes at a time!
This fan is a little different...5 blades instead of 4
But my flying style is what burned it out
Hard to let off when your flying with nitro planes
Not like my kyosho ME109 40 gasser with a YS-110 supercharged motor in it
Take that thing up and just pin the throttle the whole flight
lolol
Oh well...just money right?
(the J-10 survived the perfect deadstick landing)
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Old 04-04-2008, 04:28 PM
  #130  
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LOL, I dont trust anything less than a 60A in a 70mm EDF plane for that reason. Yeah hard to be easy on the power when running laps with other planes. Yeah its just money lol.

Hope to maiden mine on the new power setup this weekend. I can't wait to see the results of this setup. Gonna balance for 1 4S and 2 4S in parrallel. With the 2 4S packs I would get about 7-8 minutes flight time.

Jason
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Old 04-09-2008, 07:40 PM
  #131  
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Ordered my A4 Skyhawk (AUD$68) from eflypower today.
Only got the stock motor and fan (AUD$53) reason being is that I just spent a ton on paying the
phone/internet/rates/power bill and bought a bunch of of other stuff, new Pitts airframe, 3 ESC's, a few motors, servos, 2 DX6i's and extra recievers.

So I'm rather broke and wanted the A4 right away, so could not wait to save up for the extra power of the HET fan/motor.
If it turns out to be underpowered I'll upgrade the fan later. My friend ordered the HET fan, so he'll kick my ass in our racing laps.

I also order 2 set of mini GWS retracts. If thet are too weak I'll just leave then retacted and use for display only.

USMC, I'll let you know if I need help with the retacts, but your pics so far have been very helpful.

Bill!
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Old 04-09-2008, 11:28 PM
  #132  
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Nice Bill. She will fly on the stock fan/motor. Slow but will fly well. As long as the fan holds together you should be golden. The fan unit is the biggest question.

Jason

P.S. Loading my A-4 in the car as I post this.
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Old 04-10-2008, 12:33 AM
  #133  
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Jason
Why are you loading it in your car?
It's not like you ever fly it!!
lolol
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Old 04-10-2008, 01:49 AM
  #134  
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Jason,
I just thought of something, when I say I got the stock motor/fan, it's not a GWS fan which I've read bad things about, i'ts a AP-700DF, reading their site they seem think it's not a bad fan. http://www.airpowernet.com/

I'll make sure I balance it, they seem to stress that it should be balanced.

And yeah, same question as USMC, you loading the car up, you going flying? Let us know how you go.

Bill.
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Old 04-10-2008, 05:02 AM
  #135  
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Well, No flying was to be had. Got to the park and the little leaguers were practicing. Did get to fly a kite:o. Plus wind was semi-calm when we left and blowing like hell when we got there off and on. Its supposed to be really nice this weekend and I freakin hope so. I am sick of this crap.

Jason
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Old 04-11-2008, 05:20 AM
  #136  
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Ok finally got 2 flights in on my A-4 today so to the doubters:p. I also have some shotty video I am editing taken by my 15 year old son who decided he would rather give commentary than film:o.

Performance was awesome and has me truely in love with her. She has now got to be in the 80 mph range and vertical is nice. Very nice handling and just a great plane. USMC she is ready to fly formation.

Jason
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Old 04-11-2008, 04:03 PM
  #137  
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Congratulations Jason WTG!!
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Old 04-11-2008, 06:10 PM
  #138  
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Well this is the best I could do out of the flight because of before mentioned videographer. Hope to get more this weekend as its supposed to be beautiful. Its short but shows I did fly it.

[media]http://www.youtube.com/watch?v=tbYREkt4ggQ[/media]
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Old 04-13-2008, 05:28 PM
  #139  
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Ok got A flight in yesterday before one of my mains pulled out of the wing bending both mains in resulting skid to a halt. Not damage to airframe other than scratches so its good in that department. My mains as stated before are now bent though and at a pretty high angle. So its either replace them or pull them. Been looking at doing a controllable launch dolly as well as retracts. The dolly would be cheaper for the time being as I do have some R/C car corpses around I could scavange parts off of. Not to mention I have at least 1 other plane in the works that could use a dolly. Taking off the gear would easily put me in the 1:1 T/W range too. Man its always something.

Jason
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Old 04-17-2008, 03:37 PM
  #140  
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OK Guys the GWS A-4 Skyhawk arrived today from eflypower.com

Two words, TOTALLY IMPRESSED. I honestly dont know how can the supply great stuff like this at the low price.
Put it this way, my flying buddy/neighbour(Peter -in the pics) immediatley logged onto eflypower & ordered one.

The box was one of biggest I have ever recieved and so is the plane (for a jet)
(Hmm then on putting the FOUR piece fuse together, it just got BIGGER!!)

After opening it up the QUALITY was to just fantantic, it came with much more than I expected,
I thought it was going to bunch of cut foam and bit and pieces thats all - It came with heaps of stuff.

Came with stock GWS fan (which fits like a glove) and the AP-700 I ordered
(which needs modifying to fit/mount - may need advice there)

The detail is very real and everything is scale (Peter knows his scale and war bird stuff) there is almost nothing to fault, even down to the manual.

After inspection and may say it again we were IMPRESSED, so we quickly did a mocked up build.

Everything slots together seamlessly, and this bird is big - for sure those GWS retracts wont be big enough!!
(I'm used to jets with a fuselage of 700mm max - Like the A-4 on Hobbycity)

This we mean there will three of us who live within 150 metres building A-4's! - LOve it.

This plane is too nice rush, so I'm going to take my time on it.

I WILL re-read this thread and get as many tips as possible.

Anyone know of any other worthwhile forums/threads on the GWS A4?
I took a few photos. I think I'll make build web page with of course with everyones ideas/tips/tricks/mods.

BELIEVE ME, I'll be back within a day, if not hours with questions!!

Bill.
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Old 04-17-2008, 11:04 PM
  #141  
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Bill, This thread on RCG has alot more info and input on this plane. Its also the one I started when GWS got mad at me for posting my non-GWS fan and motor setup. Looks of good stuff, Pics, and info. Oh and there are about 5-6 other GWS A-4 threads with info and pics of what others have done on RCG as well.

Here you go:
http://www.rcgroups.com/forums/showthread.php?t=826052

Jason
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Old 04-17-2008, 11:39 PM
  #142  
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THanks Jason,

I'll have have a look at the thread you suggest.

As I mentioned, there will be three of us building these, and when I said read the forums to one, he straight
away said, Oh, Rc Groups and I said no Wattflyer, so I'll have a look.

Yeah, that GWS thing getting mad at you well, I kind of skipped over it it after it started go and on!!

btw, I'm having fun building this thing.

Bill.

PS. The GWS fan TRULY sux, needs to trashed, good for nothing. Thank god I bought the AP-700.
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Old 04-18-2008, 07:43 AM
  #143  
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Yeah the fan is junk. They have done a few things here and there to make them better, BUT the new improved fans have still not made it to the US let alone AUS. So no biggie I fixed it and am very happy with the results.

Oh and for an FYI there are a few of us on RCG that are trying out hand launching this bird. If it goes well then it would be possible to have a light and fairly quick plane.

Jason
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Old 04-21-2008, 08:03 PM
  #144  
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USMC,

What did you use to cut the wheel wells out with??
It's a very neat job, I just going to use the knife!

Bill.
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Old 04-27-2008, 02:05 AM
  #145  
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Alot of ya'll have seen this already ...but since I like to boast

here is mine [media]http://www.youtube.com/watch?v=FvPgD5DfYGw[/media]

4min 34 sec on Hobby city 2200

taxied 15 feet after the landing and the LVC cut in......that was close

Chuck
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Old 05-03-2008, 08:06 AM
  #146  
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For the benefit of the WattFlyer crowd. Here are my doppler runs with my A-4. The fastest was clocked in the 96 MPH area. Not to shabby for having stock gear hanging down and weighing in the 45 oz range.

Jason

[media]http://www.youtube.com/watch?v=Gjop8PfbjeI[/media]
[media]http://www.youtube.com/watch?v=BM-TmaqozEI[/media]
[media]http://www.youtube.com/watch?v=H28L9m5WOOE[/media]
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Old 05-06-2008, 03:33 PM
  #147  
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Default Bill's A-4 Skyhawk build

Hi Guys,

Following from my post about what came in package and mock build.

Here's what I'm up to in the build itself. The plane is almost complete.
Just waiting on stearable nose retract to arrive, (for now using a main gear retract)

Some more painting, cosmetic cleaning and the canopy (do you think I find a decent looking JET pilot to fit. Now Way!
Gezz)

Thanks USMC your retract pictures helped heaps.
Thanks Jason your advice and posts helped heaps.
Thanks to everyone who has posted here and and on the RC Groups A-4 forum
(decided to here than the 50 page one Rc Groups).
It all helped.

I made a lot of mistakes along the way, but nothing that could not be fixed.

I realise the Mini GWS retracts are not really strong enough, but I have a plan!
The field I fly at has a cricket pitch in the centre, which is very smooth, about 2 metres wide and 25 metres long.
I would ground roll take off and belly land on the grass. And use the retracts for static display. (must make some missle pilons to save the aileron servos though)

All that is needed now is some final finishing off / cleaning up and decals, which will be Australian lively.

All Up Weight ended 872 grams, sounds pretty much in the ballpark from what I've read others weigh in at.
Quickly made a thrust gauge today, haven't tested it yet and don't think give a very good reading, but I will compare the weight vs thrust on one of my PITTS, then do the same one the A-4 to compare power to weight ratios. Well I think it's worth a shot!

I have not flown in over a year due illness, so now all I need to do is
get some stick time on a PITTS before I try maidening the A4.

The attached pics are in now order, some how the got mixed, to lazy to sort, so I'm just gunna post the lot!!

Basically the pics are of the fuselage build, wiring install, retract mod/install and my thrust gauge.

Bill.
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Old 05-06-2008, 10:57 PM
  #148  
FresnoJay
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Bill, She looks great. You did a great job. I do hope you retracts hold up at least for a while. I am gonna get some hand launches in this week and video them for all to see. The skids and hand hold I made are perfect for holding her and should protect the servos and belly well. Good luck on your maiden.

Jason
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Old 05-08-2008, 12:32 PM
  #149  
Fugitive_Bill
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Thanks for the nice comments and compliment of the plane.

I don't think the retracts will last too long, when they fail, I just to to fixed or none. Might even get gas retracts later down the line.

Bill.
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Old 05-08-2008, 05:55 PM
  #150  
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Bill, There are several spring/air retracts that will fit in this baby. Not to mention that there is also a set of digital servoless ones too. They are all in the same price range. About $100-$160 USD seems to be the price range for any of them. Again good luck with those and waiting for maiden report.

Jason
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