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Ultrafly BAE Hawk pusher prop jet - 8/5/2004 8:59:46 PM   
gtmaxx


 

Posts: 235
Joined: 1/3/2002
From: Leetonia, OH, USA
Status: offline 		Has anyone here bought or flown the Ultrafly BAE Hawk pusher prop electric jet - like the one sold at Tower Hobbies? I ask because myself and a buddy bought one each. He just finished putting his together and made her as light as possible and even with Lithiums, to meet the target weight of 570grams or less will almost be impossible. He's an accomplished builder and has been building planes and helos for year so I know he's done the best that can be done for the best possible set up here. To get their required CG would require a lot of nose weight and thus would put us over the weight limit which Ultrafly highly stresses against doing. How the h#ll can they be flying that plane on their website video using NiCad or NiMH batteries is way beyond me because the weight for 12volt setup for performance (per their recommendation) would be even higher yet. Can anyone here or elsewhere shed some light on this?? It's a nice looking bird, but **** - not worth anything if your going to fly a rock. Don't mind high wing loading as we've been their and that many a time - but this will be putting us over their highly stressed weight limits. Just don't want to see others buying it only to find out that they have a $90.00 nice looking paperweight + all the other $$$ spent to get this airborne and have nothing but nightmares with it. Really could use any and all input on this one guys!!! You may also e-mail me directly at: gtmaxx@peoplepc.com


Thanks,

Todd Walters
GT-MAXX Inc.
       Post #: 1

RE: Ultrafly BAE Hawk pusher prop jet - 8/6/2004 4:06:21 AM   
skyhawknut


 

Posts: 508
Joined: 6/9/2002
From: Surrey, BC, CANADA
Status: offline 		It flies very well on the stock setup. Even with nimh.

See for yourself............ http://www.rcgroups.com/forums/showthread.php?t=254983

(in reply to gtmaxx)
       Post #: 2

RE: Ultrafly BAE Hawk pusher prop jet - 11/10/2004 11:54:22 PM   
tonycorn


 

Posts: 15
Joined: 11/5/2003
From: Neutral Bay SydneyNSW, AUSTRALIA
Status: offline 		Hello Todd/GTMaxx,

Just finished a 'Hawk' with the Ultrafly brushless set-up, Kokam 3S lipos, 80% of the decals, Dubro pinned hinges instead of the weird ones included with the kit and used Zap 5-min epoxy (sparingly) on virtually everything. Weight came in at a shade over 500g. In fact, had to add weight near the nose to get the damn 'CG' correct. Used 2 x 7g stick-on Great Planes lead weights for that. Maiden flight will be this weekend, weather permitting. I've done a few 'system tests' and at full throttle, it wants to jump out of my hand. Receiver is a 6CH micro JR that I use on 'PPM' mode with my Futaba 9CHP.

Expectations are high for a successful flight. Am about to start (anaother) GWS A-10 with EDF-55's and brushless motors. My first A-10, which is still OK, was well over-weight as I just slapped epoxy everywhere and didn't pay any attention to 'weight control'. DOH! If A-10 #2 works OK, #1 will end up being a nice mobile hanging over my son's bed!

Best of luck.
TC in Sydney

(in reply to gtmaxx)
       Post #: 3

RE: Ultrafly BAE Hawk pusher prop jet - 11/11/2004 1:56:43 PM   
davbow


 

Posts: 159
Joined: 1/10/2004
From: sioux falls, SD, USA
Status: offline 		Beware of the "dreadful roll" on takeoff..... With the torque the engine puts out and minimal airflow over the wings during launch, she tends to want to roll

(in reply to tonycorn)
       Post #: 4

RE: Ultrafly BAE Hawk pusher prop jet - 11/17/2004 7:01:39 PM   
2605


 

Posts: 76
Joined: 2/15/2004
From: Vordingborgsj欬and, DENMARK
Status: offline 		i just finished my ultra fly bae hawk 580grams is the weigt whit 3cell lipo 2000mah
i will have the maiden flight tomorrow i hope

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(in reply to davbow)
       Post #: 5

RE: Ultrafly BAE Hawk pusher prop jet - 11/17/2004 7:04:28 PM   
2605


 

Posts: 76
Joined: 2/15/2004
From: Vordingborgsj欬and, DENMARK
Status: offline 		i just finish my ultra fly bae hawk 580grams with 3 cell lipo 2000mah

(in reply to 2605)
       Post #: 6

RE: Ultrafly BAE Hawk pusher prop jet - 11/24/2004 7:32:01 PM   
2605


 

Posts: 76
Joined: 2/15/2004
From: Vordingborgsj欬and, DENMARK
Status: offline 		have anyone been flying with their bae hawk

(in reply to 2605)
       Post #: 7

RE: Ultrafly BAE Hawk pusher prop jet - 11/30/2004 2:06:19 AM   
iflyrotors


 

Posts: 16
Joined: 10/24/2004
From: Orlando, FL, USA
Status: offline 		I flew mine a couple weeks ago, it flies great, just a little scary landing in a small field . I've got a Thunder Power 3 cell 2100mah lithium powering mine, with a castle creations pixie 20 speed control. I broke the nose a couple times because the prop was on backwards (yes, I know i'm an idiot : ), but after some glue and carbon fiber all is well. Haven't weighed it though, so i can't say if i'm heavy.
Chris

(in reply to 2605)
       Post #: 8

RE: Ultrafly BAE Hawk pusher prop jet - 4/1/2005 12:23:11 AM   
b17flyer


 

Posts: 344
Joined: 11/21/2002
From: Tampa, FL, USA
Status: offline 		did any of you have a torque problem roting to the left on take off.? I 'm upping the ail throw to compinsate.

(in reply to iflyrotors)
       Post #: 9

RE: Ultrafly BAE Hawk pusher prop jet - 4/18/2005 5:24:07 AM   
rmac714



Posts: 26
Joined: 2/18/2004
From: Smyrna, GA, USA
Status: offline 		Flew mine first time today. Launching is awkward. The finIger holes are'nt deep enough. I held the fuse just aft of the main wings. First launch with half throttle took a large chunk of finger with it. Ouch! Didn't stop the flight though. This is an amazingly fast little plane, perhaps a little too fast for such a small WS. I have a Himax 2025-4200, Cobri gearbox geared at 5 to 1 and a 9070 prop. 70mph fly-bys with literally unlimited vertical. Don't know how long it will go straight up, I would back off when it became too hard to see. Trimmed to fly straight at full throttle, when you cut the power the lack of torq is evident. There is such a small wing area, that it wants to roll. This can be compensated for and if scarey fast is your thing, this will do it. Had no small number of experienced flyers very impressed today. The biggest problem I see with this one is the landing. When you come in so hot with a plane so flat on the bottom, something has to give. Every landing caused the wing to come out of the fuse at the front. I don't see a patricularly long life for this one. I also intend on bungee launching this model from now on.

_____________________________

a brick will fly with enough power

(in reply to b17flyer)
       Post #: 10

RE: Ultrafly BAE Hawk pusher prop jet - 4/18/2005 7:44:20 PM   
b17flyer


 

Posts: 344
Joined: 11/21/2002
From: Tampa, FL, USA
Status: offline 		have had a 10+ flights now and its a good plane. I putin a carbon fiber strip to keep the plane from flexing it wings.
it actually lands slower than one might expect. I'm using the finger holes with no problem. quick throw on 1/2 power then go to full.
using 3cell 2100 lipo and the brushless motor that ultra fly sells for it.


CAN't wait for the su27

(in reply to rmac714)
       Post #: 11

RE: Ultrafly BAE Hawk pusher prop jet - 4/19/2005 7:06:32 AM   
rmac714



Posts: 26
Joined: 2/18/2004
From: Smyrna, GA, USA
Status: offline 		I'm using the Thunderpower 2100's. I finished my landing gear tonight, complete with steerable nose gear. I'll test it out tomorrow. I put the mains right on the cg with the servo and gear in the nose, allowing me to lose the lead I used for balance. I added a total of 1 1/2 ounces with the gear. I have to really get the speed high and rotate up slowly so that the prop doesn't hit on take off. I just feel more comfortable taking off and landing on a set of wheels

_____________________________

a brick will fly with enough power

(in reply to b17flyer)
       Post #: 12

RE: Ultrafly BAE Hawk pusher prop jet - 5/1/2005 2:58:46 PM   
spitgy



Posts: 127
Joined: 2/11/2003
From: Goderich, ON, CANADA
Status: offline 		I'm considering one of these things - what prop is used for them? Do you use an electric type and just turn it around or what? If you've ben flying the hawk for awhile, where is the weak link?
Thanks guys

(in reply to rmac714)
       Post #: 13

RE: Ultrafly BAE Hawk pusher prop jet - 5/2/2005 3:48:32 AM   
rmac714



Posts: 26
Joined: 2/18/2004
From: Smyrna, GA, USA
Status: offline 		I used a e-flight brushless 400,(4200kv), geared 4 to 1 Cobri gearbox, 3s 2100 thunderpower with a 9 x 7.5 prop. Absolutely ballistic flybys and almost unlimited vertical. Not for the timid. I have in fact retired mine after only a few flights. Almost took the end of my finger off on one launch. Too hard to get in the air. Even tried gear with limited success.

_____________________________

a brick will fly with enough power

(in reply to spitgy)
       Post #: 14

RE: Ultrafly BAE Hawk pusher prop jet - 5/2/2005 1:50:04 PM   
spitgy



Posts: 127
Joined: 2/11/2003
From: Goderich, ON, CANADA
Status: offline 		rmac714 - thanks for the info. Did you fly it with the stock motor? If so how did it go? I was wondering if you could use the stock setup w/ a Lipo? Whats your opinion? Will the stock motor accept a speed controller from a brushless motor? As you can tell, I don't know that much about electrics so any input would be appreciated.
Did you try launching with power off and then hit the throttle once it was in the air - avoid finger bites this way.
Thanks again.

(in reply to rmac714)
       Post #: 15

RE: Ultrafly BAE Hawk pusher prop jet - 5/4/2005 12:37:08 PM