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Two 1/4 scale Scratch built T-38's

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Old 10-13-2012, 10:08 AM
  #1
P. Richards
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Default Two 1/4 scale Scratch built T-38's

Both of these jets were damaged and hopefully we will see them fly again...

http://youtu.be/pdHCGUxS9mA

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Old 10-13-2012, 11:22 AM
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Default RE: Two 1/4 scale Scratch built T-38's

Thanks for the vid.

Did you get the story on what happened? Looks like he forced the landing, and just ran out of room.
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Old 10-13-2012, 11:33 AM
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Default RE: Two 1/4 scale Scratch built T-38's

Nice planes, and certainly easy repairable.. thanks for the videos and this is why flying in a full size airport with hundreds of yards to spare on both headings is so relaxing!
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Old 10-13-2012, 01:17 PM
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Default RE: Two 1/4 scale Scratch built T-38's

nicce jets, definetly underpowered. Would love to seea build thread on those jets
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Old 10-13-2012, 04:40 PM
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Default RE: Two 1/4 scale Scratch built T-38's


Quote:
ORIGINAL: Dr Honda

Thanks for the vid.

Did you get the story on what happened? Looks like he forced the landing, and just ran out of room.
Reports are that the one that went into the swamp (Andy's) had a Low Voltage Cutoff - bad place, bad time
The second (Brent's) had a speed control go out (again in a bad place at a bad time) so he had to force the landing.

Greg
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Old 10-13-2012, 04:42 PM
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Default RE: Two 1/4 scale Scratch built T-38's

Quote:
ORIGINAL: Ram-bro

nicce jets, definetly underpowered. Would love to seea build thread on those jets
Underpowered? I don't think so.... just not overpowered like most of our models. In fact they are close to scale (without afterburner) T/W.
Long thread on RCGroups in the scratch-build forum.

Greg
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Old 10-13-2012, 05:08 PM
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Default RE: Two 1/4 scale Scratch built T-38's


Quote:
ORIGINAL: jetflyr

Quote:
ORIGINAL: Ram-bro

nicce jets, definetly underpowered. Would love to seea build thread on those jets
Underpowered? I don't think so.... just not overpowered like most of our models. In fact they are close to scale (without afterburner) T/W.
Long thread on RCGroups in the scratch-build forum.

Greg
Greg Greg Greg, you forget that all of these newbies are experts after their first flights.....
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Old 10-13-2012, 05:49 PM
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Default RE: Two 1/4 scale Scratch built T-38's

What incredibly gorgeous model jets! The first one, 904, was definitely not underpowered. Amazingly, it sounded just like a turbine.

The stall characteristic of a full sized T-38 is essentially a mush, not a pitch over or wing drop. That is exactly what happened, the airplane simply mushed into the ground. But why would that happen with an experienced RC jet flyer on the sticks? Something else must have been in play. There appeared to be no attempt at a go around. That would indicate, to me, that there must have been a power failure of some kind. Either that, or the batteries simply were out of juice.

The T-38 is one of the most beautiful jets in the world. The real one is a serious hot rod that has killed its share of students. At low speed, as you might suspect with that tiny wing, it is not very forgiving. The final turn is flown not only with an eye on airspeed but also with the assistance of an angle of attack indicator light mounted atop the glareshield called the "donut." AOA has to maintained in a very precise range. If you are right on the money, you get a green donut; if not, you get a chevron either above or below the donut telling you which way to adjust your AOA

It's demanding enough flying a real one, but flying a 1/4 scale model of a T-38 without an airspeed or AOA indicator has to be incredibly difficult. I sure hope those guys can get their birds patched up and get through the learning curve on those beautiful machines so the modeling world gets to see them fly once again.



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Old 10-13-2012, 06:34 PM
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Default RE: Two 1/4 scale Scratch built T-38's


Quote:
ORIGINAL: DavidR


Quote:
ORIGINAL: jetflyr

Quote:
ORIGINAL: Ram-bro

nicce jets, definetly underpowered. Would love to seea build thread on those jets
Underpowered? I don't think so.... just not overpowered like most of our models. In fact they are close to scale (without afterburner) T/W.
Long thread on RCGroups in the scratch-build forum.

Greg
Greg Greg Greg, you forget that all of these newbies are experts after their first flights.....
Oh Crap! What was I thinking![8D]
Greg
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Old 10-13-2012, 06:39 PM
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Default RE: Two 1/4 scale Scratch built T-38's


Quote:
ORIGINAL: Dustflyer

What incredibly gorgeous model jets! The first one, 904, was definitely not underpowered. Amazingly, it sounded just like a turbine.

The stall characteristic of a full sized T-38 is essentially a mush, not a pitch over or wing drop. That is exactly what happened, the airplane simply mushed into the ground. But why would that happen with an experienced RC jet flyer on the sticks? Something else must have been in play. There appeared to be no attempt at a go around. That would indicate, to me, that there must have been a power failure of some kind. Either that, or the batteries simply were out of juice.
904 became a glider on turning base -low voltage cut off (see my post above)
for LOTS of info on the build, and flying - as well as several videos go to:
http://www.rcgroups.com/forums/showthread.php?t=1559834

Greg
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Old 10-13-2012, 06:40 PM
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Default RE: Two 1/4 scale Scratch built T-38's

Quote:
ORIGINAL: Ram-bro

nicce jets, definetly underpowered. Would love to seea build thread on those jets
Here you go..

http://www.rcgroups.com/forums/showthread.php?t=1559834

I thought that they looked to be flying at a scale speed..

Doh! Jetflyer just beat me to the link

Thanks

dave
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Old 10-13-2012, 06:44 PM
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Default RE: Two 1/4 scale Scratch built T-38's

Wow, I aam a newbie now....thats a good one but say what you must. When I say underpoweere, I am not looking for a jet to go vertical on takeoff but there definiietly needs to be enough power to power out of situations. I fly a Byron T33 on a ram 750 and it flies scale but has enough push to keep it lively. I have seen the fullsize fly for most of my life ( air force brat and military service) and those takeoffs as slow as they were did not seem scale to me....just my opinion. I salute the builder and designer .....
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Old 10-14-2012, 03:37 AM
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Default RE: Two 1/4 scale Scratch built T-38's


Quote:
ORIGINAL: jetflyr


Quote:
ORIGINAL: Dustflyer

What incredibly gorgeous model jets! The first one, 904, was definitely not underpowered. Amazingly, it sounded just like a turbine.

The stall characteristic of a full sized T-38 is essentially a mush, not a pitch over or wing drop. That is exactly what happened, the airplane simply mushed into the ground. But why would that happen with an experienced RC jet flyer on the sticks? Something else must have been in play. There appeared to be no attempt at a go around. That would indicate, to me, that there must have been a power failure of some kind. Either that, or the batteries simply were out of juice.
904 became a glider on turning base -low voltage cut off (see my post above)
for LOTS of info on the build, and flying - as well as several videos go to:
http://www.rcgroups.com/forums/showthread.php?t=1559834

Greg
That would sure explain it. What a bummer. The guy flew it well.
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Old 10-14-2012, 08:46 AM
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Default RE: Two 1/4 scale Scratch built T-38's

Wow.... I can't believe people say these aircraft are not underpowered. 1/4 scale at 130mph when the full size has a top speed of 850mph. I respect the builders and the project they are doing but the airplanes look like they are one turn away from falling out of the sky. If that's scale flying, you can keep it. I would much rather have the power to rumble through big manuvers.
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Old 10-15-2012, 05:41 AM
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Default RE: Two 1/4 scale Scratch built T-38's

Great job on scratch building guys. Almost nobody does it anymore. I would like to see the electric catch up to the turbine in duration but love those T38's. My skymaster is a joy to fly

Good luck on the repairs and next test hops. 1/4 scale is awesome size.
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Old 10-16-2012, 08:51 AM
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Default RE: Two 1/4 scale Scratch built T-38's


Quote:
ORIGINAL: Joe Westrich

Wow.... I can't believe people say these aircraft are not underpowered. 1/4 scale at 130mph when the full size has a top speed of 850mph. I respect the builders and the project they are doing but the airplanes look like they are one turn away from falling out of the sky. If that's scale flying, you can keep it. I would much rather have the power to rumble through big manuvers.
+1
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Old 10-16-2012, 08:59 AM
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Default RE: Two 1/4 scale Scratch built T-38's

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ORIGINAL: Joe Westrich

Wow.... I can't believe people say these aircraft are not underpowered. 1/4 scale at 130mph when the full size has a top speed of 850mph. I respect the builders and the project they are doing but the airplanes look like they are one turn away from falling out of the sky. If that's scale flying, you can keep it. I would much rather have the power to rumble through big manuvers.
+1 about the planes looking underpowered, especially in turns and when going into a vertical.

With that said, the models themselves looked amazing. Hats off to the builders.
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Old 10-16-2012, 10:48 AM
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Default RE: Two 1/4 scale Scratch built T-38's

Hey guys, Let's get one of them repaired and use the fuse as a plug to make a mold. We can make a couple of glass fuses just as light if not lighter than the versions that you produced using the foam...and we can make them faster and easier too in case there's another mishap. Would love to talk to you about that. Are either of you going to Best in the West? If so, look me up.

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Old 10-16-2012, 11:07 AM
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Default RE: Two 1/4 scale Scratch built T-38's

I think this T-38 is over powered

http://www.youtube.com/watch?v=LWu0XC-a7QQ
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Old 10-16-2012, 11:19 AM
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Default RE: Two 1/4 scale Scratch built T-38's

Beautiful planes, and a beautiful job building/designing them. I had a friend who died in one a few years ago. He would loved to have seen them fly. Great video as usual.
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Old 10-16-2012, 11:21 AM
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Default RE: Two 1/4 scale Scratch built T-38's

NOW that is what I call going vertical!!
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Old 10-16-2012, 11:47 AM
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Default RE: Two 1/4 scale Scratch built T-38's


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ORIGINAL: basimpsn

I think this T-38 is over powered

http://www.youtube.com/watch?v=LWu0XC-a7QQ
Now that's what I'm talking about!!

I am questioning myself on why I don't have one of these alread.....
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Old 10-16-2012, 11:48 AM
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Default RE: Two 1/4 scale Scratch built T-38's


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ORIGINAL: basimpsn

I think this T-38 is over powered

http://www.youtube.com/watch?v=LWu0XC-a7QQ

Yeah, but its NASA flying that one. I think they are required to go vertical on takeoff......
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Old 10-16-2012, 12:38 PM
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Default RE: Two 1/4 scale Scratch built T-38's

Quote:
ORIGINAL: Joe Westrich


Quote:
ORIGINAL: basimpsn

I think this T-38 is over powered

http://www.youtube.com/watch?v=LWu0XC-a7QQ
Now that's what I'm talking about!!

I am questioning myself on why I don't have one of these alread.....
I was thinking the same thing
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Old 10-16-2012, 12:52 PM
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Default RE: Two 1/4 scale Scratch built T-38's

glad to see that I am not the only who thinks these planes could use a lil more push. One of the problems could be it is just to light for its size and lacks a little inertia.
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