Comp ARF BAE Hawk build thread
04-02-2019, 05:03 PM
#2276
Senior Member
Hi all just bought a second hand C a r f Hawk just two hours flight time and very well built, jet munt 140 and flys great.
it does not have the fuz strakes and if some body would be good enough to let me know the measurements I would be very grateful , width front and back and length would be good.thanks
has taken me a week to read this thread from start to Finnish!, but well worth it
it does not have the fuz strakes and if some body would be good enough to let me know the measurements I would be very grateful , width front and back and length would be good.thanks
has taken me a week to read this thread from start to Finnish!, but well worth it
05-11-2019, 07:57 PM
#2278
My son Louie's CARF Hawk is plenty fast on an "old, old" Cheetah! I can only imagine how fast it would be on a 170 Cheetah!
Dave Wilshire has pointed out several times that aileron crow is not necessary to land a CARF Hawk, but we can tell you from a *lot* of experience on hard-surface runways in various wind conditions, that aileron crow with full-flaps makes landing much more of a non-event and much less anxiety producing...
Nice plane Rich!
Bob
Dave Wilshire has pointed out several times that aileron crow is not necessary to land a CARF Hawk, but we can tell you from a *lot* of experience on hard-surface runways in various wind conditions, that aileron crow with full-flaps makes landing much more of a non-event and much less anxiety producing...
Nice plane Rich!
Bob
Thanks!
Kenric
05-13-2019, 01:19 PM
#2283
Thread Starter
Just reducing the overall lift the wing can develop. 3/8" is a load 1/8" may help if the aileron neutral is not set correctly. I'm not aware of a single CARF hawk flying in the UK with any CROW...
05-13-2019, 04:27 PM
#2284
Hey Dave, one issue i remember on the hawk i could not get it to stop doing is when i was short final and brought the throttle back to idle it would wing rock all the time. I'm hopping the crow would help with that. I even added a Igyro 3e to see if that would help but i never got around to setting the gyro up. only have one or two flights with the gyro never flew the hawk again.
05-13-2019, 09:04 PM
#2285
Thread Starter
Never experienced that, the main issue I think that is driving this is the flaps don’t go fully up because of how they go under the fuselage fairing. Some work on the fairing and the flaps nearly go up enough to meet the wing profile. If you set the ailerons level with the flap it has wash-in with drooped ailerons. I set the ailerons by the tip mould seam, for some owners I might even set the ailerons a 1/8” high to add a little more washout. It lands solid like this
Dave
Dave
05-14-2019, 03:32 PM
#2287
My Feedback: (21)
Crow
Well , it works exceptionally well for me.
If you catch a gust that causes you to balloon a couple of feet above the runway on landing approach and your speed is low and your engine is not spooled you will cartwheel. It does happen. Ask me how I know 😬
If it happens, maybe one of these guys who say it’s not needed will repair your airplane gratis. There is No downside to having some crow in the landing flap position. A little extra drag is helpful on landing and it helps the wing to stall at the root before the tips.
I don’t use it in the mid “takeoff “ position as I don’t want any extra drag or lift killing aspects on takeoff.
They screwed up the wing saddle molding and when the flaps are “ up “ they are really not completely up. So if you match the ailerons to the flaps the ailerons are actually drooped. This accentuates the roll off of the airplane at low airspeed. In reality, crow is just correcting the MFG error. Personally ,I don’t like the looks of aileron reflex with the flaps up ,so I only deploy it with full flaps. I also don’t need it at cruise.
If you catch a gust that causes you to balloon a couple of feet above the runway on landing approach and your speed is low and your engine is not spooled you will cartwheel. It does happen. Ask me how I know 😬
If it happens, maybe one of these guys who say it’s not needed will repair your airplane gratis. There is No downside to having some crow in the landing flap position. A little extra drag is helpful on landing and it helps the wing to stall at the root before the tips.
I don’t use it in the mid “takeoff “ position as I don’t want any extra drag or lift killing aspects on takeoff.
They screwed up the wing saddle molding and when the flaps are “ up “ they are really not completely up. So if you match the ailerons to the flaps the ailerons are actually drooped. This accentuates the roll off of the airplane at low airspeed. In reality, crow is just correcting the MFG error. Personally ,I don’t like the looks of aileron reflex with the flaps up ,so I only deploy it with full flaps. I also don’t need it at cruise.
05-15-2019, 06:21 PM
#2288
Totally agree with you Bob, as Dave stated don't line up the ailerons with the flaps, follow the mold line on the wing and that will naturally give the
ailerons a few mms of reflex. This got me thinking, while I love crow, and use it on my hawk. In over 400 flights on my hawk Ive never done any stall testing with it.
Conditions were nearly ideal today with almost zero wind so I took her out and put 5 flights on it. I was really surprised with what I found. In the clean configuration
this jet will stall like a 172. I had full up elevator and she absolutely would NOT drop a wing just sit there and porpoise up and down the whole length of the field.
It was very impressive I wish someone would have recorded it. In landing configuration gear up (with crow) she pretty much did the same but was sinking a bit more, but still
remained completely wings level.
It gave me a lot more confidence in a jet that I already have a tremendous amount of confidence in. I will have to record my elevator throw and CG to share, as that
could obviously change someones results. For what its worth mine is powered with a cheetah 140 and weighs in at 28 pounds dry.
ailerons a few mms of reflex. This got me thinking, while I love crow, and use it on my hawk. In over 400 flights on my hawk Ive never done any stall testing with it.
Conditions were nearly ideal today with almost zero wind so I took her out and put 5 flights on it. I was really surprised with what I found. In the clean configuration
this jet will stall like a 172. I had full up elevator and she absolutely would NOT drop a wing just sit there and porpoise up and down the whole length of the field.
It was very impressive I wish someone would have recorded it. In landing configuration gear up (with crow) she pretty much did the same but was sinking a bit more, but still
remained completely wings level.
It gave me a lot more confidence in a jet that I already have a tremendous amount of confidence in. I will have to record my elevator throw and CG to share, as that
could obviously change someones results. For what its worth mine is powered with a cheetah 140 and weighs in at 28 pounds dry.
05-16-2019, 05:19 PM
#2289
Well, I have a lot of flights on my old Hawk and never used Crow, I did not line up the ailerons with the flaps, I did it like Dave told us to. But I am surprised you could not get a wing to drop when intentionally stalling her, I occasionally pull to much elevator when horsing her around, usually after flying my F-16 or something and mine definitely wants to snap at any speed with enough AOA.
05-16-2019, 09:19 PM
#2290
Thread Starter
This is what some pilots don’t seem to understand. You can get an airframe that seems completely stable to snap if you pitch fast enough. The sudden change in AOA can cause the airflow to break away and the wing stalls. Do it slowly and many wing sections will fly at huge angles of attack and although the lift is reduced there is not a violent stall.
This goes for pilots who suffered snaps on the UF, Xcalibur and other well known airframes, if you grab at something it will break away. Like driving your car fast around corners, steer smoothly and it will grip to incredible levels, snatch at the steering and you will get understeer and the thing will not turn.
This goes for pilots who suffered snaps on the UF, Xcalibur and other well known airframes, if you grab at something it will break away. Like driving your car fast around corners, steer smoothly and it will grip to incredible levels, snatch at the steering and you will get understeer and the thing will not turn.
05-16-2019, 09:48 PM
#2291
Point well taken. But the Hawk is capable of wicked snaps and done on purpose it’s a nice feature. This Hawk, even being a sport Hawk , should still be flown with care. I would not recommend large control surface deflections or excessive expo, or “horsing it around” the pattern.
05-17-2019, 05:44 AM
#2293
Totally agree with you Bob, as Dave stated don't line up the ailerons with the flaps, follow the mold line on the wing and that will naturally give the
ailerons a few mms of reflex. This got me thinking, while I love crow, and use it on my hawk. In over 400 flights on my hawk Ive never done any stall testing with it.
Conditions were nearly ideal today with almost zero wind so I took her out and put 5 flights on it. I was really surprised with what I found. In the clean configuration
this jet will stall like a 172. I had full up elevator and she absolutely would NOT drop a wing just sit there and porpoise up and down the whole length of the field.
It was very impressive I wish someone would have recorded it. In landing configuration gear up (with crow) she pretty much did the same but was sinking a bit more, but still
remained completely wings level.
It gave me a lot more confidence in a jet that I already have a tremendous amount of confidence in. I will have to record my elevator throw and CG to share, as that
could obviously change someones results. For what its worth mine is powered with a cheetah 140 and weighs in at 28 pounds dry.
ailerons a few mms of reflex. This got me thinking, while I love crow, and use it on my hawk. In over 400 flights on my hawk Ive never done any stall testing with it.
Conditions were nearly ideal today with almost zero wind so I took her out and put 5 flights on it. I was really surprised with what I found. In the clean configuration
this jet will stall like a 172. I had full up elevator and she absolutely would NOT drop a wing just sit there and porpoise up and down the whole length of the field.
It was very impressive I wish someone would have recorded it. In landing configuration gear up (with crow) she pretty much did the same but was sinking a bit more, but still
remained completely wings level.
It gave me a lot more confidence in a jet that I already have a tremendous amount of confidence in. I will have to record my elevator throw and CG to share, as that
could obviously change someones results. For what its worth mine is powered with a cheetah 140 and weighs in at 28 pounds dry.
I use crow crow in mine, and I agree it’s not “needed” but we do a lot of things in our hobby that we don’t “need”. For me I find it just adds a little more stability and helps to slow it down. So I’ll keep using it, I like the way it feels.
08-12-2019, 07:20 PM
#2294
Senior Member
My Feedback: (85)
I picked up a busted Hawk for a rebuild, but it did not have the front retract mount.
By chance has any one got a cad file or a pdf drawing of that structure. I am trying to save the time creating it out of card board.
Somebody said it might be possible to buy it from Comp Arf.
Thanks
Clay
By chance has any one got a cad file or a pdf drawing of that structure. I am trying to save the time creating it out of card board.
Somebody said it might be possible to buy it from Comp Arf.
Thanks
Clay
09-06-2019, 04:49 PM
#2296
Join Date: Nov 2004
Location: Sao Jose dos CamposSP, BRAZIL
Posts: 269
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BAE HAWK TIRES,
Buddies,
I have a Hawk purchased by 2014 and equiped with the old pneumatic landing gear sold that time.
I fly in a paved runway and my last tires are almost gone.
I have been informed the current electric landing gear tires are not compatible with the old wheels/landing gear.
Any idea about how to find any tire for my Hawk?
Regards
Buddies,
I have a Hawk purchased by 2014 and equiped with the old pneumatic landing gear sold that time.
I fly in a paved runway and my last tires are almost gone.
I have been informed the current electric landing gear tires are not compatible with the old wheels/landing gear.
Any idea about how to find any tire for my Hawk?
Regards
09-06-2019, 04:54 PM
#2297
Senior Member
BAE HAWK TIRES,
Buddies,
I have a Hawk purchased by 2014 and equiped with the old pneumatic landing gear sold that time.
I fly in a paved runway and my last tires are almost gone.
I have been informed the current electric landing gear tires are not compatible with the old wheels/landing gear.
Any idea about how to find any tire for my Hawk?
Regards
Buddies,
I have a Hawk purchased by 2014 and equiped with the old pneumatic landing gear sold that time.
I fly in a paved runway and my last tires are almost gone.
I have been informed the current electric landing gear tires are not compatible with the old wheels/landing gear.
Any idea about how to find any tire for my Hawk?
Regards
09-08-2019, 09:10 PM
#2299
Thread Starter
Dangerous words...I was told ��
No, the gear became a problem when Airtech shut its doors with little warning, but like most of the range Electron are making the mechanics for the two Hawks now, so things are good again.
DW
No, the gear became a problem when Airtech shut its doors with little warning, but like most of the range Electron are making the mechanics for the two Hawks now, so things are good again.
DW
09-08-2019, 09:40 PM
#2300
Is the electron gear a drop in fit in the model? Has the model been reworked for the electrons, or will the electrons also fit an older hawk?