Comp ARF BAE Hawk build thread
02-24-2015, 12:41 PM
#2001
Thread Starter
Err this is turbine to EDF!? It depends on inlets, outlet size. I've opened the inlets on this, cheated with some other openings I'll show later, maximised the outlet and the Hawk is light!
What is it, you can pm or email [email protected]
Dave
What is it, you can pm or email [email protected]
Dave
03-04-2015, 02:17 PM
#2004
Jamie
Your CARF Hawk probe will be in the post in the morning.
I had to make the insert to around 5.65mm as there would not be a lot of area at the front of the insert etc if you wrap a bit of 800 wet/dry
around a 5mm drill you will be able to clean out a bit the ridges inside the carbon tube etc before gluing in with Hysol.
Alan
Your CARF Hawk probe will be in the post in the morning.
I had to make the insert to around 5.65mm as there would not be a lot of area at the front of the insert etc if you wrap a bit of 800 wet/dry
around a 5mm drill you will be able to clean out a bit the ridges inside the carbon tube etc before gluing in with Hysol.
Alan
Last edited by fireblade5437; 03-04-2015 at 02:22 PM.
03-07-2015, 11:22 PM
#2008
Hi Paul
That's a good looking Hawk! You have made a nice job of fitting the pitot in considering you didn't have the molding.
Was you able to cut down the larger insert or did you use it all?
Thanks Marty, it's also the Hawker Hunter pitot I made for Paul I want to see but that won't be done yet!
Thanks to Paul as well for having patience as both probes took around 4 weeks to get to him!
No more probes for this week as off to Germany for a week at lunchtime for work today, good job I just came off the Warfarin with all the German beer to choose from!
Had to repost the picture that Paul put on the Skymaster Hawk thread, vey nice scheme wouldn't mind doing another CARF Hawk painted in that!
Alan
That's a good looking Hawk! You have made a nice job of fitting the pitot in considering you didn't have the molding.
Was you able to cut down the larger insert or did you use it all?
Thanks Marty, it's also the Hawker Hunter pitot I made for Paul I want to see but that won't be done yet!
Thanks to Paul as well for having patience as both probes took around 4 weeks to get to him!
No more probes for this week as off to Germany for a week at lunchtime for work today, good job I just came off the Warfarin with all the German beer to choose from!
Had to repost the picture that Paul put on the Skymaster Hawk thread, vey nice scheme wouldn't mind doing another CARF Hawk painted in that!
Alan
Last edited by fireblade5437; 03-07-2015 at 11:34 PM.
03-08-2015, 02:11 AM
#2009
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Hi guys,
Looking for an airframe without turbine if anybody has one they want to move on. Any Carf Hawk considered, drop me a line @ [email protected]
Many thanks
Dan.
Looking for an airframe without turbine if anybody has one they want to move on. Any Carf Hawk considered, drop me a line @ [email protected]
Many thanks
Dan.
04-10-2015, 02:02 PM
#2010
has anyone used restrictors in their retracts , or are they just using the stock retracts with no restrictors
reason I ask is I want to avoid having the retracts SLAM in and out
thanks
Izzy
reason I ask is I want to avoid having the retracts SLAM in and out
thanks
Izzy
04-11-2015, 07:53 AM
#2013
My hawk is almost done! Front gear doors and CG still need to be done, as well as a bit of aileron differential programming and the addition of decals. Turbine is Kingtech 140G. Retracts are direct from Airtech in Germany. Fired up the turbine in my backyard and I nearly blew the fence down.
. I love this paint scheme, looks fast standing still.
Have not weighed it yet.
Last edited by sharam; 04-11-2015 at 08:22 AM.
04-11-2015, 11:03 PM
#2014
Hi guys!
I bought a second hand CARF Hawk June last year. Actually three other pilots have had this one before me. It is the old version (2009 I guess) with too small air cylinders on the retracts. It ended up having its nose and wing tips all scratched up and the main gear was torn out leaving bad scars under the wing. The third owner put an effort into it and replaced the bad cylinders to overcome the retract issues. A smoke system, scale pilot and light was added. The model was flown quite a few times, but the pilot was not really satisfied with the way the aircraft raised it's nose every time her throttled up even though he raised the turbine a few millimeters.
When I received the aircraft (less turbine), the electric and pneumatic installation seemed to be robust and working fine, but is could have been looking better ;-). I emptied the plane and reinstalled the electrics and pneumatics just adding a few new air hoses and electric cables. I removed a lot of unnecessary wires, removed the smoke system and even removed the nice looking cockpit and pilot. All in all I removed 2kg reducing the dry weight from 14.9kg to 12.9kg!
I kept the cg (marked by the previous owner at 190mm), stock control throws (+4mm crow on full flaps) , added a Wren 140pro and had some 25 flights on it last year. It is a really nice and easy plane to fly and all my fears about the Hawk tendencies vanished. I would sum up the flight characteristics like this:
- Stock control throws are smooth and give quite high roll rate at full stick movement.
- I needed serious down elevator on inverted
- I needed some down elevator on knife edge
- I could not provoke a tip stall during landing. Even with full elevator the plane would rise its nose some and eventually drop out when below flying speed
- The plane seemed nose heavy for several reasons, but the thing bothering me was that it would not fly level. When I trimmed it at 1/2 throttle I needed to hold some elevator to keep level at slow passes. When I opened up the plane did go into vertical without touching the elevator stick :-(
- During take-off it needs quite high speed before the elevators overcome the heavy weight on the nose wheel
I read through this thread (which took a while :-)) and noted the following:
1. Both the thread starter and several other owners recommend moving the CG to 205-208mm
2. Several owners report improvements when raising the turbine
3. "ELA" uses mixing of down elevator with throttle in addition to the two point above
Based on this I had to do some surgery again to move the CG and change the thrust line. Batteries and hopper tank was moved aft to meet CG of 205mm and the turbine raised about 12mm. I had to raise the elevator servo mount 9mm to allow for pipe clearance.
Back on the field I did 15 flights on her and was pleased to find that the flight characteristics in general was improved. Significantly lower weight on the nose wheel, improved inverted and improved knife edge. On landing I got her nose up seriously when applying elevator during flaring. Eventually it dropped the left wing at full elevator and veeeery low speed. The plane is still rising when opening up, but a lot less than with the stock setup. Next step is mixing :-)
Be aware that the low weight on the nose wheel allows for early rotation during take-off, but at these low speeds there is a high risk of one wing dropping.
Greetings from Norway!
Keep posting!
I bought a second hand CARF Hawk June last year. Actually three other pilots have had this one before me. It is the old version (2009 I guess) with too small air cylinders on the retracts. It ended up having its nose and wing tips all scratched up and the main gear was torn out leaving bad scars under the wing. The third owner put an effort into it and replaced the bad cylinders to overcome the retract issues. A smoke system, scale pilot and light was added. The model was flown quite a few times, but the pilot was not really satisfied with the way the aircraft raised it's nose every time her throttled up even though he raised the turbine a few millimeters.
When I received the aircraft (less turbine), the electric and pneumatic installation seemed to be robust and working fine, but is could have been looking better ;-). I emptied the plane and reinstalled the electrics and pneumatics just adding a few new air hoses and electric cables. I removed a lot of unnecessary wires, removed the smoke system and even removed the nice looking cockpit and pilot. All in all I removed 2kg reducing the dry weight from 14.9kg to 12.9kg!
I kept the cg (marked by the previous owner at 190mm), stock control throws (+4mm crow on full flaps) , added a Wren 140pro and had some 25 flights on it last year. It is a really nice and easy plane to fly and all my fears about the Hawk tendencies vanished. I would sum up the flight characteristics like this:
- Stock control throws are smooth and give quite high roll rate at full stick movement.
- I needed serious down elevator on inverted
- I needed some down elevator on knife edge
- I could not provoke a tip stall during landing. Even with full elevator the plane would rise its nose some and eventually drop out when below flying speed
- The plane seemed nose heavy for several reasons, but the thing bothering me was that it would not fly level. When I trimmed it at 1/2 throttle I needed to hold some elevator to keep level at slow passes. When I opened up the plane did go into vertical without touching the elevator stick :-(
- During take-off it needs quite high speed before the elevators overcome the heavy weight on the nose wheel
I read through this thread (which took a while :-)) and noted the following:
1. Both the thread starter and several other owners recommend moving the CG to 205-208mm
2. Several owners report improvements when raising the turbine
3. "ELA" uses mixing of down elevator with throttle in addition to the two point above
Based on this I had to do some surgery again to move the CG and change the thrust line. Batteries and hopper tank was moved aft to meet CG of 205mm and the turbine raised about 12mm. I had to raise the elevator servo mount 9mm to allow for pipe clearance.
Back on the field I did 15 flights on her and was pleased to find that the flight characteristics in general was improved. Significantly lower weight on the nose wheel, improved inverted and improved knife edge. On landing I got her nose up seriously when applying elevator during flaring. Eventually it dropped the left wing at full elevator and veeeery low speed. The plane is still rising when opening up, but a lot less than with the stock setup. Next step is mixing :-)
Be aware that the low weight on the nose wheel allows for early rotation during take-off, but at these low speeds there is a high risk of one wing dropping.
Greetings from Norway!
Keep posting!
04-12-2015, 12:39 AM
#2017
Thread Starter
The early kits had low elevator plates, so the thrust tube could not be raised (like yours). I have a throttle to elevator mix that comes in at mid throttle stick position to full gas.
Take off with some flap the Hawk should float off with little AOA.
Dave
Take off with some flap the Hawk should float off with little AOA.
Dave
04-12-2015, 05:38 PM
#2018
Correct! I love the way mine takes off, very scale like. I also have a down elevator mix starting at 1/2 throttle and I can do a low pass and add full thrust and the Hawk continues on straight and level, a simple mix and excellent results. I agree that the Hawk requires a lot of down elevator when inverted or pushing through inverted figures, it is a bit disconcerting but I have never had mine do anything unusual even with all that down elevator input. I have mine mixed for hands off knife edge, even at less than high speeds I can let the Hawk slide to very low altitude, hold it, then climb away all in knife edge. This is I think the aircrafts forte. I also think this Hawk is extremely smooth, no need for a gyro on this bad boy. I have my CG at around 200mm. I would not recommend a high AOA at any time with this jet though. I think the "wing drop" is pretty severe when it quits flying and won't go near it in my flying after a big repair job after a high AOA landing went south very early in its career. I typically touch down with the nose gear 3-4" off the deck. About 200 flights now, Cheetah power!
04-13-2015, 12:35 PM
#2020
I put some make-up on her this winter as well. Quick and dirty but looks good enough:
Pitot made put of 8mm Wood rod. Shaped by sanding in while rotating in a electric drill. Painted in silver
Bunny-ears made by glassing some styro, fitted by sanding directly on the plane. Did cut holes in plane for extra air intake:
Vents made by two layers of glassing on a piece of plastic bag. Holes cut by Dremel 0.4mm blade:
APE from a piece of plastic plumbing:
Pitot made put of 8mm Wood rod. Shaped by sanding in while rotating in a electric drill. Painted in silver
Bunny-ears made by glassing some styro, fitted by sanding directly on the plane. Did cut holes in plane for extra air intake:
Vents made by two layers of glassing on a piece of plastic bag. Holes cut by Dremel 0.4mm blade:
APE from a piece of plastic plumbing:
04-13-2015, 12:48 PM
#2021
And some more:
Wing tip lights:
Top strobe light and antenna:
The two other vents which i do not know the naming of:
VG's from 1mm fiberglass. Just followed the wing panel lines:
Flap hinge covers made by glassing 6mm depron:
And added a drop tank from an old Feibao Hawk which had a short life....
Wing tip lights:
Top strobe light and antenna:
The two other vents which i do not know the naming of:
VG's from 1mm fiberglass. Just followed the wing panel lines:
Flap hinge covers made by glassing 6mm depron:
And added a drop tank from an old Feibao Hawk which had a short life....
04-13-2015, 07:08 PM
#2024
hi guys, looking to get a hawk from carf but noticed at the accessories and noticed that the LG they have is awful, I have read here that it is the Air tech but at their site they show a very different set, can any one confirm which one is it please? Also, what about a nice cockpit set????
CArf : http://carf-models.com/en/products/b...ear/parent/943
AIRTECH : http://www.airtech-germany.de/epages...roducts/700112
CArf : http://carf-models.com/en/products/b...ear/parent/943
AIRTECH : http://www.airtech-germany.de/epages...roducts/700112
