Introducing the TopRC Model Hawker Hunter - New Scale Jet
10-16-2020, 05:29 AM
#106
I fueled the jet about 3/4 full, enough to start filling the top tank, with diesel fuel yesterday afternoon. I let the jet sit a couple hours to see if anything leaked, which it did not. Time for the real show, a test run and static thrust test. It all went well, ear plugs in and tolerant neighbors. I ran it almost dry and went full throttle a few times. The pull is enormous, a steady 37 lbs. I tied a rope to the plane, and a post lamp, and put in a couple small loops to attach a digital fish scale. That's where the thrust readings came from. I had to do it quick because you can't breath back there...the fumes are overwhelming. It also blew my cap across the yard.
The next project is to build a Vanessa Swing to balance it, and weigh the model. I'll show a picture of that later today if I get that far.
The next project is to build a Vanessa Swing to balance it, and weigh the model. I'll show a picture of that later today if I get that far.
10-16-2020, 06:58 AM
#107
Join Date: Nov 2003
Location: Mexico CityD.F., MEXICO
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Hello Pull up now
I balanced mine from the wing root, I think the drawing in thee last pages is wrong,
290 for the first flight is ok, but still a little nose heavy for my taste
I balanced mine from the wing root, I think the drawing in thee last pages is wrong,
290 for the first flight is ok, but still a little nose heavy for my taste
10-16-2020, 09:42 AM
#108
It’s a poorly thought out design where it’s impossible to get a good balance since the fuel is in front of the balance. The balance goes back as the fuel burns, so make it safe to land and just deal with the nose heavy flight, like most scale jets it flies fine while nose heavy
10-17-2020, 06:11 AM
#111
Didn’t get the chance to do a root measurement, but with landing ( after flight) fuel I picked it up with two fingers wrapped under the LE 2” out from the saw tooth.
10-17-2020, 10:24 AM
#112
Glad the flight was successful. So, it balanced 2" outboard of the extended leading edge on landing fuel. Good information. But can you summarize the trim on takeoff, and then on landing? Did it land too much nose high? Was the landing with full flaps? Was the landing with the air brake deployed? Thanks!
10-17-2020, 10:51 AM
#113
I have around 5 flights total with this aeroplane. It is nose heavy at take off, needs some up trim at this point, as the fuel burns the elevator goes back to level for the last minute/landing.
The gear is poor, as supplied the oleos were packed with heavy grease, so little compression. We removed some of this grease to allow compression. The flight today with a gentle landing on grass bent the lower leg machined part. Previous flights the nose leg came apart, the sleeve at the base of the top section came off. It’s all soft alloy and grass operations is probably not a good place.
Alway take off with some flap-around 20mm. Landing full flap I don’t have a figure, but 75 degrees or so.
The aeroplane flies really well, but the gear needs work to be reliable.
Dave
The gear is poor, as supplied the oleos were packed with heavy grease, so little compression. We removed some of this grease to allow compression. The flight today with a gentle landing on grass bent the lower leg machined part. Previous flights the nose leg came apart, the sleeve at the base of the top section came off. It’s all soft alloy and grass operations is probably not a good place.
Alway take off with some flap-around 20mm. Landing full flap I don’t have a figure, but 75 degrees or so.
The aeroplane flies really well, but the gear needs work to be reliable.
Dave
10-17-2020, 11:37 AM
#114
I have around 5 flights total with this aeroplane. It is nose heavy at take off, needs some up trim at this point, as the fuel burns the elevator goes back to level for the last minute/landing.
The gear is poor, as supplied the oleos were packed with heavy grease, so little compression. We removed some of this grease to allow compression. The flight today with a gentle landing on grass bent the lower leg machined part. Previous flights the nose leg came apart, the sleeve at the base of the top section came off. It’s all soft alloy and grass operations is probably not a good place.
Alway take off with some flap-around 20mm. Landing full flap I don’t have a figure, but 75 degrees or so.
The aeroplane flies really well, but the gear needs work to be reliable.
Dave
The gear is poor, as supplied the oleos were packed with heavy grease, so little compression. We removed some of this grease to allow compression. The flight today with a gentle landing on grass bent the lower leg machined part. Previous flights the nose leg came apart, the sleeve at the base of the top section came off. It’s all soft alloy and grass operations is probably not a good place.
Alway take off with some flap-around 20mm. Landing full flap I don’t have a figure, but 75 degrees or so.
The aeroplane flies really well, but the gear needs work to be reliable.
Dave
Thanks,
Rick
10-17-2020, 12:38 PM
#115
Rick
There are never too many questions! Balancing the way you have will be better as his is probably nose heavy overall. You will not get into trouble with so much fuel forward, you will feel the balance as the fuel burns and chose your ideal position. Not used the AB, but flap or AB on a Hunter has little or no pitch change. If you fly on tarmac the AB will hit the ground.
Dave
There are never too many questions! Balancing the way you have will be better as his is probably nose heavy overall. You will not get into trouble with so much fuel forward, you will feel the balance as the fuel burns and chose your ideal position. Not used the AB, but flap or AB on a Hunter has little or no pitch change. If you fly on tarmac the AB will hit the ground.
Dave
10-25-2020, 07:00 AM
#116
Hi guys.
Maiden done. Balance as mentioned in my previous post is very good starting point. at beginning of flight slightly nose heavy but after few minutes its ok. Flies very well with a 120 turbine, very agile and good scale vertical performance.
David is right about softness of landing gear, for some reason turbine flamed out in final and landed short of runway on rough grass and lower leg part of struts bent. part of reason is probably stifness of the struts springs.
Regards
Eduardo
Maiden done. Balance as mentioned in my previous post is very good starting point. at beginning of flight slightly nose heavy but after few minutes its ok. Flies very well with a 120 turbine, very agile and good scale vertical performance.
David is right about softness of landing gear, for some reason turbine flamed out in final and landed short of runway on rough grass and lower leg part of struts bent. part of reason is probably stifness of the struts springs.
Regards
Eduardo
10-25-2020, 07:20 AM
#117
I fueled the jet about 3/4 full, enough to start filling the top tank, with diesel fuel yesterday afternoon. I let the jet sit a couple hours to see if anything leaked, which it did not. Time for the real show, a test run and static thrust test. It all went well, ear plugs in and tolerant neighbors. I ran it almost dry and went full throttle a few times. The pull is enormous, a steady 37 lbs. I tied a rope to the plane, and a post lamp, and put in a couple small loops to attach a digital fish scale. That's where the thrust readings came from. I had to do it quick because you can't breath back there...the fumes are overwhelming. It also blew my cap across the yard.
The next project is to build a Vanessa Swing to balance it, and weigh the model. I'll show a picture of that later today if I get that far.
The next project is to build a Vanessa Swing to balance it, and weigh the model. I'll show a picture of that later today if I get that far.
very nice. you may wana give one of my RDT's a try for that futaba
10-26-2020, 03:52 PM
#122
If flying at events or in other high noise situations, immediately realizing there is a flameout can save your plane. Telemetry can alert you right away.
01-09-2022, 01:36 AM
#124
Join Date: Feb 2017
Location: Geneva
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Dear All,
I'm finishing my Hunter. I notice that the train is not really of good quality. The brakes are really not very powerful. Concerning the legs, to land and take off from the grass have you made any modifications? I was already thinking of replacing the mechanisms by Electron but for the legs it's more complicated (I am in discussion with them to see what is possible..) .... Have you been able to make them reliable?
I'm finishing my Hunter. I notice that the train is not really of good quality. The brakes are really not very powerful. Concerning the legs, to land and take off from the grass have you made any modifications? I was already thinking of replacing the mechanisms by Electron but for the legs it's more complicated (I am in discussion with them to see what is possible..) .... Have you been able to make them reliable?
01-09-2022, 05:32 AM
#125
The legs are the main issue on grass. They are made from really low quantity soft aluminium. They need the heavy grease removing and lighter grease adding to allow some compression.
Since the factory has the files for machining it would make sense they up their game…
Since the factory has the files for machining it would make sense they up their game…