Comp ARF BAE Hawk build thread
#1956
Thread Starter
It will fly if you keep it light and simple, I have flown a few with old P-120 turbines and they have plenty of power for scale flying. As always to fly true scale without the energy of the full scale you need lots of power. If you fly a little faster you can still fly reasonable size loops using part energy, part wing and part power! Flight times will be 8 minutes because of high power use.
Dave
#1957
My Feedback: (6)
Jan
It will fly if you keep it light and simple, I have flown a few with old P-120 turbines and they have plenty of power for scale flying. As always to fly true scale without the energy of the full scale you need lots of power. If you fly a little faster you can still fly reasonable size loops using part energy, part wing and part power! Flight times will be 8 minutes because of high power use.
Dave
It will fly if you keep it light and simple, I have flown a few with old P-120 turbines and they have plenty of power for scale flying. As always to fly true scale without the energy of the full scale you need lots of power. If you fly a little faster you can still fly reasonable size loops using part energy, part wing and part power! Flight times will be 8 minutes because of high power use.
Dave
Mike
#1958
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Join Date: Nov 2009
Location: Vestby, NORWAY
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Hello
Great thread Building my CARF Hawk now - and am in the process of mounting the tailpipe. How did you guys secure it at the back of the fuselage?
Thanks!
Kind regards
Helihover
Great thread Building my CARF Hawk now - and am in the process of mounting the tailpipe. How did you guys secure it at the back of the fuselage?
Thanks!
Kind regards
Helihover
#1959
Thread Starter
Its not secured. The cool wall (outer tube) sits a few mm out of the rear fuselage.
Ignore my manual and mount the front of the tube as high as possible (not hitting the elevator plate or denting on the rudder former loop)
Which turbine?
Dave
Ignore my manual and mount the front of the tube as high as possible (not hitting the elevator plate or denting on the rudder former loop)
Which turbine?
Dave
#1960
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Hi Dave - and thanks:-)
So it is just mounted at the front end? Hm...Ok:-)
Turbine is JetCentral Cheetah SP.
Colour scheme is Red Arrows 2012 - made when it was a custom scheme.
Helihover
So it is just mounted at the front end? Hm...Ok:-)
Turbine is JetCentral Cheetah SP.
Colour scheme is Red Arrows 2012 - made when it was a custom scheme.
Helihover
#1961
Thread Starter
Yes, mine has been the same since the thread started and its still good! I really like the scheme, my friend Paul has the one I posted here (first one of the series production) and I really like it as a scheme. I guess you have snow till March?
Dave
Dave
#1962
Helihover, all pipes stretch a little bit when getting hot so its not a good idea to secure it in both ends :-) The inner pipe is th one that moves most but also the outer is a litle bit alive.
Eivind
Eivind
#1964
My Feedback: (3)
Time to overhaul the air system on one of my main gears and I have questions... This is the stock CARF supplied sport gear for the Hawk. A leak has developed suddenly and is a consistent leak starting after about 175 flights. It is coming from the small O-ring that acts as a seal for the piston shaft as the piston moves back and forth in the cylinder. It is leaking when the main gear is up and the air pressure is held between the piston ring seal and the O-ring in the block that the cylinder threads on to. I can hear air leaking and see bubbles forming at this seal. I guess a small piece of debris may have cut or scored that O-ring. My CARF rep here in the states is sending me a new piston but after removing and cleaning and replacing the O-ring and having it continue to leak, and inspecting the piston shaft and finding no defects, I think I need a new O-ring. It is quite small. Does anyone have experience with this or specs for the tiny O-ring? I will also contact the manufacturer of the gear but thought I would ask here first and hopefully source the O-rings quickly and or locally. Thanks
Last edited by husafreak; 01-01-2015 at 12:47 PM.
#1965
Thread Starter
Time to overhaul the air system on one of my main gears and I have questions... This is the stock CARF supplied sport gear for the Hawk. A leak has developed suddenly and is a cosistent leak starting after about 175 flights. It is coming from the small O-ring that acts as a seal for the piston shaft as the piston moves back and forth in the cylinder. It is leaking when the main gear is up and the air pressure is held between the piston ring seal and the O-ring in the block that the cylinder threads on to. I can hear air leaking and see bubbles forming at this seal. I guess a small piece of debris may have cut or scored that O-ring. My CARF rep here in the states is sending me a new piston but after removing and cleaning and replacing the O-ring and having it continue to leak, and inspecting the piston shaft and finding no defects, I think I need a new O-ring. It is quite small. Does anyone have experience with this or specs for the tiny O-ring? I will also contact the manufacturer of the gear but thought I would ask here first and hopefully source the O-rings quickly and or locally. Thanks
Couple of shots from Tuesday at CJ 61.
Dave
#1966
My Feedback: (3)
Thanks Dave. I will have just contacted Airtech and hopefully they will reply soon. Or I may have to get the seals from you. It sounds like you do not have the O-ring size? I could pop it back out and measure it but I'm not sure I can measure an old O-ring accurately.. Those rods are not shiny smooth, and we fly in very dusty conditions here in CA, so wear is surely a by product.
Last edited by husafreak; 01-01-2015 at 12:55 PM.
#1968
Thread Starter
In the office again now so I could have measured them. Think there are a mix of sizes out there, my mains and nose are the same size, he's made lots of changes over the years!
Guess you will get sorted quickly and have a few dozen for spares!
Dave
Guess you will get sorted quickly and have a few dozen for spares!
Dave
#1972
Gents,
been following this for some time now and have a couple of questions if thats ok?
Dave, how is the EDF Hawk coming along? any further developments or pic's? This version is of real interest to me.
Does anybody know of an EDF (Schubeler Fan) version flying within the UK? Would love to get a look at one and have a chat to the pilot. Also could do with a noise test as my current site operates strictly to the 82db limit suggested by the BMFA and I am sure you can appreciate it's a lot of time and money to tie up in a project that may not be allowed to fly at my prefered site and we are not allowed to fly turbines! (Boooo).
Fabulous work with all the help on here guy's, it's refreshing to find a forum where nobody's moaning! Top work and many thanks.
Dan.
been following this for some time now and have a couple of questions if thats ok?
Dave, how is the EDF Hawk coming along? any further developments or pic's? This version is of real interest to me.
Does anybody know of an EDF (Schubeler Fan) version flying within the UK? Would love to get a look at one and have a chat to the pilot. Also could do with a noise test as my current site operates strictly to the 82db limit suggested by the BMFA and I am sure you can appreciate it's a lot of time and money to tie up in a project that may not be allowed to fly at my prefered site and we are not allowed to fly turbines! (Boooo).
Fabulous work with all the help on here guy's, it's refreshing to find a forum where nobody's moaning! Top work and many thanks.
Dan.
#1973
Thread Starter
Dan
Not touched it for months again, but its a high priority for early this year! I moved the fuselage yesterday onto the main work bench. It really does not need much work, its just time around other business stuff. There isn't another in the UK. Based on our Spark experience with the DS 77HST it will be well inside 82db, the Spark HDT is very noisy, the HST silent!
I'll post here as it progresses and obviously when its flown.
Dave
Not touched it for months again, but its a high priority for early this year! I moved the fuselage yesterday onto the main work bench. It really does not need much work, its just time around other business stuff. There isn't another in the UK. Based on our Spark experience with the DS 77HST it will be well inside 82db, the Spark HDT is very noisy, the HST silent!
I'll post here as it progresses and obviously when its flown.
Dave
#1974
Hi Dave,
many thanks for the update and also your feelings on the noise issue. Gives me confidence to pursue further and I look forward to any further updates going forward.
All the best for now,
Dan
many thanks for the update and also your feelings on the noise issue. Gives me confidence to pursue further and I look forward to any further updates going forward.
All the best for now,
Dan
#1975
Thread Starter
Hoping to do some more work on the EDF Hawk this coming week, Ready to install the thrust tube rolled from mylar sheet. managed to open the rear of the fuselage to the largest possible opening as we don't want high velocity air (minimal compression on the fan swept area)