Comp ARF BAE Hawk build thread
05-17-2015, 10:27 PM
#2076
Mine has turned 30l of diesel into noise and fun now. What a plane I have to say! I have removed some 40g(now 210g) of lead from the nose and propably will take some more. But CG is pretty close now.
I had Gopro inboard for several flights and I noticed high vacuum inside the fuselage. I have few scale outlets in my fuse but no bunny ears yet. I'd say it's better to open them too. Vacuum is in the highest point with gear up, zero airspeed and max throttle. Then canopy sides are flexing both 1cm inwards maybe... 140XBL is screaming for more air. Does anybody else have this problem?
/Jyri
I had Gopro inboard for several flights and I noticed high vacuum inside the fuselage. I have few scale outlets in my fuse but no bunny ears yet. I'd say it's better to open them too. Vacuum is in the highest point with gear up, zero airspeed and max throttle. Then canopy sides are flexing both 1cm inwards maybe... 140XBL is screaming for more air. Does anybody else have this problem?
/Jyri
05-17-2015, 10:45 PM
#2077
Thread Starter
This is common with unducted fuselages, its "blowing up" with air pressure in flight and sucking in when the turbine sucks air.
Look at the fuselage and canopy on the ground, I think you will see only a very small movement, so the turbine is breathing fine.
Dave
Look at the fuselage and canopy on the ground, I think you will see only a very small movement, so the turbine is breathing fine.
Dave
05-18-2015, 02:49 AM
#2078
Mine has turned 30l of diesel into noise and fun now. What a plane I have to say! I have removed some 40g(now 210g) of lead from the nose and propably will take some more. But CG is pretty close now.
I had Gopro inboard for several flights and I noticed high vacuum inside the fuselage. I have few scale outlets in my fuse but no bunny ears yet. I'd say it's better to open them too. Vacuum is in the highest point with gear up, zero airspeed and max throttle. Then canopy sides are flexing both 1cm inwards maybe... 140XBL is screaming for more air. Does anybody else have this problem?
/Jyri
I had Gopro inboard for several flights and I noticed high vacuum inside the fuselage. I have few scale outlets in my fuse but no bunny ears yet. I'd say it's better to open them too. Vacuum is in the highest point with gear up, zero airspeed and max throttle. Then canopy sides are flexing both 1cm inwards maybe... 140XBL is screaming for more air. Does anybody else have this problem?
/Jyri
would reallylike to see some videos
can you post them .?
05-30-2015, 12:47 AM
#2080
izzy
Here is one video of those onboard flights mentioned earlier: https://www.youtube.com/watch?v=wr6ElcxvwGo
Local cousin dropped in to say hello on third flight. (pic.)
It is still nose heavy to my taste but getting closer all the time. It climbs on full throttIe and needs lot of push when inverted. Some push is also present on knife edge too. I have also reduced elevator and aileron throws a bit. Now I have only 120g of lead on the nose. Almost 40 liters consumed. Tried dyed heating oil instead of diesel with good results. Datasheet claims max 6ppm of sulfur compared to 5ppm of diesel. Helps with refueling because you'll be able to see the fuel level trough aramid tank. I ordered 20l of DTE Light so it's not going to run out soon
/Jyri
Here is one video of those onboard flights mentioned earlier: https://www.youtube.com/watch?v=wr6ElcxvwGo
Local cousin dropped in to say hello on third flight. (pic.)
It is still nose heavy to my taste but getting closer all the time. It climbs on full throttIe and needs lot of push when inverted. Some push is also present on knife edge too. I have also reduced elevator and aileron throws a bit. Now I have only 120g of lead on the nose. Almost 40 liters consumed. Tried dyed heating oil instead of diesel with good results. Datasheet claims max 6ppm of sulfur compared to 5ppm of diesel. Helps with refueling because you'll be able to see the fuel level trough aramid tank. I ordered 20l of DTE Light so it's not going to run out soon
/Jyri
05-30-2015, 10:26 AM
#2081
Jyri hi
thanks for the video
I maidened my hawk yesterday
words are hard to describe her
it flies just as
well as the ultra flash , but with more drag , and more presence
anyone contemplating a hawk, this is the one ,look no further
thanks for the video
I maidened my hawk yesterday
words are hard to describe her
it flies just as
anyone contemplating a hawk, this is the one ,look no further
05-30-2015, 12:28 PM
#2083
Hi izzy
Congrats of your maiden! Nice colors you have there! That should be highly visible on every possible weather.
I've burnt 50 liters now. In less that a month. Thats how good plane it is Lost a gear door again but this time I have onboard video so I know roughly where it is... It was third nose gear door so easy to replace even if not found on the field.
/Jyri
Congrats of your maiden! Nice colors you have there! That should be highly visible on every possible weather.
I've burnt 50 liters now. In less that a month. Thats how good plane it is
Lost a gear door again but this time I have onboard video so I know roughly where it is... It was third nose gear door so easy to replace even if not found on the field./Jyri
06-17-2015, 06:05 AM
#2084
Time for update.
Almost 70 liters burnt now. Time for some scale detailing. Things like under belly fins, canopy frames inside and few holes and bumbs added on fuselage. Start of aluminium basecoat also. Already had to add some CA to aileron horn to eliminate slop. They made noise when pushing it on tarmac and not running the engine.
It seems that it need more airspeed when balanced more aft. I'm on somewhat 205mm now. I have messed up touch down by underspeed and caused bad bouncing on tarmac. Having some throttle on final helps this. I have a feeling that nose oleo is too stiff and part of the bouncing problem. I have already ordered new softer springs for it but does anybody experience about this? Is it going to get worse with soft front? Of course landing it perfectly is the key but...
/Jyri
Almost 70 liters burnt now. Time for some scale detailing. Things like under belly fins, canopy frames inside and few holes and bumbs added on fuselage. Start of aluminium basecoat also. Already had to add some CA to aileron horn to eliminate slop. They made noise when pushing it on tarmac and not running the engine.
It seems that it need more airspeed when balanced more aft. I'm on somewhat 205mm now. I have messed up touch down by underspeed and caused bad bouncing on tarmac. Having some throttle on final helps this. I have a feeling that nose oleo is too stiff and part of the bouncing problem. I have already ordered new softer springs for it but does anybody experience about this? Is it going to get worse with soft front? Of course landing it perfectly is the key but...
/Jyri
07-09-2015, 02:36 AM
#2085
my main struts have soft springs i think , and the plane wobbles if the front wheel has too much movement
for reference , i have reduced movement and can barely get a 8 mtr radius on taxi
thinking of changing springs to stiffer ones , but dont want to over do it to minimize pressure on the small wooden retract mounts
is anyone else having same issues
for reference , i have reduced movement and can barely get a 8 mtr radius on taxi
thinking of changing springs to stiffer ones , but dont want to over do it to minimize pressure on the small wooden retract mounts
is anyone else having same issues
07-09-2015, 04:40 AM
#2086
my main struts have soft springs i think , and the plane wobbles if the front wheel has too much movement
for reference , i have reduced movement and can barely get a 8 mtr radius on taxi
thinking of changing springs to stiffer ones , but dont want to over do it to minimize pressure on the small wooden retract mounts
is anyone else having same issues
for reference , i have reduced movement and can barely get a 8 mtr radius on taxi
thinking of changing springs to stiffer ones , but dont want to over do it to minimize pressure on the small wooden retract mounts
is anyone else having same issues
Mike
07-09-2015, 08:48 AM
#2087
What comes to bouncing and springs I do agree mains being soft and knocking middle door off the mains as real problem. Done that too several times now actually. But I have to say I kinda like to see it crouching on the ground like real thing. Only thing that looks funny is when you apply too much wheel brake and it crouches even more. Key is to me to brake softly. Same goes for the wobbling too. Small movements on nose gear unless very low speed. I use dual rates for that...
For bouncing I found the cure from much softer nose leg spring. I don't know the spring constant of that original super hard spring but it is much more than the 35N/mm. Ordered set of springs and like 11N/mm most. It loads like the mains on fuelled plane.
Anyway 115 liters consumed and more than 10h in air. Somewhat 150 landings now. Managed to get some of those long nose gear floating landings also. Those always look great with Hawks. Paints ordered today and I think I'll got my own secret agent to the factory to take me good photos of the original paint sheme. He even offered original paints
/Jyri
For bouncing I found the cure from much softer nose leg spring. I don't know the spring constant of that original super hard spring but it is much more than the 35N/mm. Ordered set of springs and like 11N/mm most. It loads like the mains on fuelled plane.
Anyway 115 liters consumed and more than 10h in air. Somewhat 150 landings now. Managed to get some of those long nose gear floating landings also. Those always look great with Hawks. Paints ordered today and I think I'll got my own secret agent to the factory to take me good photos of the original paint sheme. He even offered original paints
/Jyri
Last edited by jjantti; 07-09-2015 at 08:53 AM.
07-24-2015, 01:02 PM
#2088
A short movie of my CARF Hawk in summertime in Norway. This is before adding scale details and with a severely nose heavy plane :-)
https://www.youtube.com/watch?v=2LvRIdDz1Rs
Cheers!
https://www.youtube.com/watch?v=2LvRIdDz1Rs
Cheers!
07-24-2015, 04:01 PM
#2089
Great video!!
what struts are you using ?
what struts are you using ?
A short movie of my CARF Hawk in summertime in Norway. This is before adding scale details and with a severely nose heavy plane :-)
https://www.youtube.com/watch?v=2LvRIdDz1Rs
Cheers!
https://www.youtube.com/watch?v=2LvRIdDz1Rs
Cheers!
07-25-2015, 01:26 AM
#2091
07-28-2015, 08:36 AM
#2093
http://www.youtube.com/watch?v=tsSrfGFiOQQ
What a great weekend. Had a blast with the hawk. Flys perfect.
08-02-2015, 11:25 AM
#2096
Finally got the wings on, first time since spraying fuz. Still got wing to do as obviously they don't match up!
I have two more pitot tubes to make but after having cataract op done 4 weeks ago I cannot see good enough to make on lathe yet but having eye test done this week so will get new lens. So the guys waiting I will be on them next weekend.
This unfortunately was supposed to have the wing painted last summer but ended up busting ankle. :-(
Right I have a problem with one of the wooden blocks in the wing one side the block appears to have pulled down into the wing, the other side is fine with the M5 cap head proud of the wing the other side the cap head bolt is about 2mm lower than wing skin.
Does anyone know exactly what the assembly is on the block of wood where wing fixing bolt goes through?
Just had a look with a torch through the flap and it appears to have big block of hard balsa on the inside of the rib. Pressed a small diameter length of carbon rod into this block and it does appear very hard but it did leave a small indent hence why I think it's hard balsa. Thinking of filling hole in with Hysol and re-bore hole for head of cap head but obviously not as deep as the bolt goes presently
Alan
I have two more pitot tubes to make but after having cataract op done 4 weeks ago I cannot see good enough to make on lathe yet but having eye test done this week so will get new lens. So the guys waiting I will be on them next weekend.
This unfortunately was supposed to have the wing painted last summer but ended up busting ankle. :-(
Right I have a problem with one of the wooden blocks in the wing one side the block appears to have pulled down into the wing, the other side is fine with the M5 cap head proud of the wing the other side the cap head bolt is about 2mm lower than wing skin.
Does anyone know exactly what the assembly is on the block of wood where wing fixing bolt goes through?
Just had a look with a torch through the flap and it appears to have big block of hard balsa on the inside of the rib. Pressed a small diameter length of carbon rod into this block and it does appear very hard but it did leave a small indent hence why I think it's hard balsa. Thinking of filling hole in with Hysol and re-bore hole for head of cap head but obviously not as deep as the bolt goes presently
Alan
Last edited by fireblade5437; 08-02-2015 at 12:49 PM.
08-03-2015, 06:29 AM
#2097
Hawk does look much better when painted I have to admit...
Meanwhile I have added some small details on mine and flown some more. Tires has lost some diameter and wing tips are heavilly scrached now. Easy to fix before paint My Pitot- tube is just two pieces of carbon tube epoxied together and aluminium nut on the root. Aluminium tape on top. Not as good as real rotated al- spike but bearable. Since I have ordered Xicoy Flight Computer with airspeed sensor I have to re-think that too...
I was suprised to see soot on my pipe seam. I would have tought it it breathing in and not like that. Not sure if the gap is correct... anyway it works well.
/Jyri
Meanwhile I have added some small details on mine and flown some more. Tires has lost some diameter and wing tips are heavilly scrached now. Easy to fix before paint
My Pitot- tube is just two pieces of carbon tube epoxied together and aluminium nut on the root. Aluminium tape on top. Not as good as real rotated al- spike but bearable. Since I have ordered Xicoy Flight Computer with airspeed sensor I have to re-think that too...I was suprised to see soot on my pipe seam. I would have tought it it breathing in and not like that. Not sure if the gap is correct... anyway it works well.
/Jyri
Last edited by jjantti; 08-03-2015 at 06:32 AM.
08-03-2015, 09:04 AM
#2098
Looking good Jyri, I did make a live Pitot tube for one guy but I don't think he ever reported back if it worked ok with his sensor at the back etc
Just cleaned up both wing mounting holes, bored out a little with boring tool. It does appear thankfully to be a softwood and not hard balsa, greased some pins with grease so Hysol don't stick to them.
Alan
Removed the fibreglass rods ok and left stainless washer in place so once dried off should be a bit more secured, depth of Hysol is around 8-10mm
Just cleaned up both wing mounting holes, bored out a little with boring tool. It does appear thankfully to be a softwood and not hard balsa, greased some pins with grease so Hysol don't stick to them.
Alan
Removed the fibreglass rods ok and left stainless washer in place so once dried off should be a bit more secured, depth of Hysol is around 8-10mm
Last edited by fireblade5437; 08-03-2015 at 10:36 AM.