Shulman Aviation Turbinator ARF
#151
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RE: Shulman Aviation Turbinator ARF
Instructions say it needs to be 7" back from the leading edge but from where do they want you to measure that from? From where the wing meets the fuzz or from the root rib?
From post #110 of this thread.
Put a straight edge along the LE and mark where the straight edge meets the fuselage sides ignoring the intake. That imaginary point is the start point from where the CG is measured.
A designer usually dimensions a CG measurement along the fuselage chord even though the CG is calculated as a percentage of the mean chord. For model airplanes we use the measurement as defined by the chord section at the fuselage sides in the profile drawing on the plans. Some designers reference the root chord at the center of the fuselage. But, in the case of the Turbinator, use the chord section at the sides of the fuselage.
I realize this is becoming a lost art with ARF models that don't have plans. So I don't describe it clearly since I assume builders know how to measure the CG, and often they don't. My bad.
A designer usually dimensions a CG measurement along the fuselage chord even though the CG is calculated as a percentage of the mean chord. For model airplanes we use the measurement as defined by the chord section at the fuselage sides in the profile drawing on the plans. Some designers reference the root chord at the center of the fuselage. But, in the case of the Turbinator, use the chord section at the sides of the fuselage.
I realize this is becoming a lost art with ARF models that don't have plans. So I don't describe it clearly since I assume builders know how to measure the CG, and often they don't. My bad.
#152
Join Date: Jun 2006
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Maidened mine over the weekend, nice flying jet. I am enjoying it. Video attached, cameraman missed the landing though. I am using a Jets Munt VT80 with dreamworks all electric retract brake setup on mine.
Turbinator ARF maiden - YouTube
Turbinator ARF maiden - YouTube
#153
On my wing I had to cut out the fiberglass sleeves that were in all the wing bolt hold holes to relieve them alittle as to align the bolts so they would thread into the blind nuts to hold down the wing. I am wondering if I should now install a new sleeve out of carbon or aluminum into these holes? I believe that sleeve is more so there to keep the holes from elongating than preventing crushing.
#156
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I had balance mine with the gear up, if I balance with the gear down I could get rid of 2oz of the nose, I just wanted to be safe first flight. Assume it is supposed to be balance with the gear down anyways at 7" correct?
#157
I balanced mine at 7" too at the Fuzz sides.
What I actually did before I test flew it was to find the MAC (Mean Aerodynamic Chord), then I extended the 7" line chord wise till it intersected with the MAC.
I found the chord line and the MAC intersection to be 28% of the MAC.
SO you can measure the 7" anywhere from the fuzz intake sides to the centre root rib.
Also I had to put 650 grams (1.43 pounds) to balance.
So I permanently glued in a mix of 450 grams (0.99 pounds) using epoxy and gunshot right in the front nose accesed by removing the nose retract
The other 200 grams (0.44 pounds) was truck wheel balance weights taped to a removable battery tray that I had made.
Mario..
What I actually did before I test flew it was to find the MAC (Mean Aerodynamic Chord), then I extended the 7" line chord wise till it intersected with the MAC.
I found the chord line and the MAC intersection to be 28% of the MAC.
SO you can measure the 7" anywhere from the fuzz intake sides to the centre root rib.
Also I had to put 650 grams (1.43 pounds) to balance.
So I permanently glued in a mix of 450 grams (0.99 pounds) using epoxy and gunshot right in the front nose accesed by removing the nose retract
The other 200 grams (0.44 pounds) was truck wheel balance weights taped to a removable battery tray that I had made.
Mario..
#158
I have had my kit for a couple of months and have been working slowly on it but it's about done except for the engine install, I was wondering did anyone find that the
aileron throw available was less than it should be unless you hinge with a bigger gap? I ended up trimming a bit of the wing sheeting to get more throw.
aileron throw available was less than it should be unless you hinge with a bigger gap? I ended up trimming a bit of the wing sheeting to get more throw.
Last edited by ira d; 08-14-2013 at 10:43 PM.
#159
Ira D.
I don't think I got all the up travel as was listed in the manual but it was close. I can measure for you but that will be in the next couple of days. I found all the recommended throws to be right on. I'm using 30%expo of ailerons and elevator too.
Soon I will try more flap then the 2.5" because I think it needs to be a bit more draggy especially when you have no head wind to slow you down. At the moment I have only 9 flights on mine so I will continue to fly it as is before I start playing with more flap throws.
I don't think I got all the up travel as was listed in the manual but it was close. I can measure for you but that will be in the next couple of days. I found all the recommended throws to be right on. I'm using 30%expo of ailerons and elevator too.
Soon I will try more flap then the 2.5" because I think it needs to be a bit more draggy especially when you have no head wind to slow you down. At the moment I have only 9 flights on mine so I will continue to fly it as is before I start playing with more flap throws.
#161
Ira D.
I don't think I got all the up travel as was listed in the manual but it was close. I can measure for you but that will be in the next couple of days. I found all the recommended throws to be right on. I'm using 30%expo of ailerons and elevator too.
Soon I will try more flap then the 2.5" because I think it needs to be a bit more draggy especially when you have no head wind to slow you down. At the moment I have only 9 flights on mine so I will continue to fly it as is before I start playing with more flap throws.
I don't think I got all the up travel as was listed in the manual but it was close. I can measure for you but that will be in the next couple of days. I found all the recommended throws to be right on. I'm using 30%expo of ailerons and elevator too.
Soon I will try more flap then the 2.5" because I think it needs to be a bit more draggy especially when you have no head wind to slow you down. At the moment I have only 9 flights on mine so I will continue to fly it as is before I start playing with more flap throws.
can be enough to not let the plane slow down as quick as you would like.
#163
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Ive had a few of the mounts for the control horns break on me. Have to admit probably due to the wheels up landing. Either way I think they are a little brittle and in the long run may become a weak link. So I had a friend of mine machine some from aluminum.
#165
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Nice work! I will point out however, the next gear up landing will transfer that load to the control surface or servo instead of snapping the horn. All you are doing is moving the failure point. We had one gear up landing as well (flameout) and the only damage was a broken horn... Easy to replace
#167
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All,
Checking my balance point and weight to balance. It took 28.25 ounces or 1.765625 pounds to balance. I followed the method by putting a straight edge of the front of the wing and marking where the fuse sides meet the wing not including the intakes. Then I measured back 7 inches.
I just want to make sure I made no glaring mistakes before I install the weight permanently.
Thanks for looking.
Scott
Checking my balance point and weight to balance. It took 28.25 ounces or 1.765625 pounds to balance. I followed the method by putting a straight edge of the front of the wing and marking where the fuse sides meet the wing not including the intakes. Then I measured back 7 inches.
I just want to make sure I made no glaring mistakes before I install the weight permanently.
Thanks for looking.
Scott
#168
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NEED HELP -Looking for the Turbinator's BUILDING MANUAL
Hello.
Last week, I bought a Turbinator kit in Europe during Jet Power, but there was no building manual in the box and the seller (Al's Hobbies in England) told me that there was no manual for this plane.
It's just a little bit curious, as the more because several Turbinators's owners wrote in some previous posts that they refer to a manual...
After all, if this document exists in your country, I should really appreciate if one of you could send me by mail a copy of this Turbinator's building manual.
It would be of a great help.
I thank all of you in advance for your understanding.
Best regards.
John
Hello.
Last week, I bought a Turbinator kit in Europe during Jet Power, but there was no building manual in the box and the seller (Al's Hobbies in England) told me that there was no manual for this plane.
It's just a little bit curious, as the more because several Turbinators's owners wrote in some previous posts that they refer to a manual...
After all, if this document exists in your country, I should really appreciate if one of you could send me by mail a copy of this Turbinator's building manual.
It would be of a great help.
I thank all of you in advance for your understanding.
Best regards.
John
#169
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Scroll down to the bottom of the page, links are at the bottom.
http://www.dreamworksrc.com/catalog/...rf-Orangewhite
http://www.dreamworksrc.com/catalog/...rf-Orangewhite
#170
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Hello Jamie.
I thank you very much for your post.
The link you gave me answers prefectly to my concern.
I shall now go on with confidence in the building of my plane.
Of course, I shall also continue to look at the posts on the forum in order to see all news, advises and flight reports of the Turbinator's community.
Best regards.
John
I thank you very much for your post.
The link you gave me answers prefectly to my concern.
I shall now go on with confidence in the building of my plane.
Of course, I shall also continue to look at the posts on the forum in order to see all news, advises and flight reports of the Turbinator's community.
Best regards.
John
#172
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Just got my turbinator arf, and was wondering what you guys are using for pushrods? my kit only came with the guides ... was thinking of usinf cf tube and setting in threaded ends with hysol
#174
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Working on the wings i noticed if i mount the horn on the mounting blocks in the ailerons it's offset from the servo horn about 1/2" did you guys just mount it in the block or move it over into the balsa?
#175
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Just finishing up my turbinator, looks like i need 1.5lbs in the nose, i'm using a k-80 and have the turbine exhaust almost flush at the output, would i be better off moving the turbine more towards the cg and possibly adding less nose weight or just add the 1.5 lbs to the nose?