Impressive! Rubber power is much harder than it looks. Twin rubber power is already a whole new level! A testament to the build quality and know how on how to use the rubber motors! Thank you for sharing!
Beautiful plane and wonderful flight. Interesting that Wally mentioned his "twin guru Vance" and you mentioned writing a tune. I presume you're both talking about Vance Gilbert. I bring this up because I was involved in music as a life course for many years, and was familiar Vance's music and had friends who would attend his songwriting workshops. IMAGINE HOW SURPRISED I was when I became reacquainted with free flight models a while back (after a hiatus of many decades) only to discover that Vance is also a very highly regarded model builder. A very talented man. Wally is also a very talented man. Loved the birds flying around the plane.
Yessir, we are indeed referring to Vance. Amazing guy indeed. Wally, by the way, was just inducted into the Free Flight Hall of Fame last week. A well deserved honor!
Well I guess you guys must know Tom Hallman pretty well. This twin is beautiful, I never once entertained even the SLIGHTEST doubt in its capacity to get up there. The little red & yellow fella is right up my alley and no mistake. Damn me, but if THAT'S not in trim, then I don't know what is. Thank you Josh and Wally for showing us these fabulous birds. 👍
Beautiful plane, would have liked to see a flight after the last suggested trim modifications. Good to know that even extremely experienced modelers have challenges trimming from time to time.
A little research on the original XP-82 provides some guidance. It had counter rotating props, with the blades going up in the center. It wouldn't fly going the other way. More to the point for this model, it had two huge four blade propellers, with big fat paddle blades. Big propellers were necessary to transfer the huge power required for higher speed. Propellers act like a forward fin. That must be balanced with tail fin. Note the large strake on this plane. The simplest solution to the yaw instability would be four blade props. The added weight in a more favorable position would reduce the need for nose ballast. You might see a reduction in the revolution rate, leading to longer motor runs.
noticed you tossed it with left wing down also dihedral improves level flight but on a free flight you do not want a straight line or it will fly away gone forever do you put your id on your planes ? even a little difference in the thrust will cause a turn
Absolutely a beautiful build…the only thing better than a P51…an F82! I bet he has a bunch of interesting aircraft on his shelf at home. Sounds like you had the best mentors as a youngun 😃
The circle seems to be tightening as the power runs down. This could get nasty if you get this plane to go much higher. I think this may be because the propeller is less engaged. The propeller balances the fin. A larger propeller will have an effect similar to a smaller fin.
It's a convenient way of tweaking the CG when the plane is still being trimmed out. Once it's dialed it, the clay can be replaced with lead on the inside of the nose openings.
A tendency to turn right or left with indifference is a yaw divergence, in the extreme case known as a spiral dive. In this case it is stable and limited. In the extreme case, the circle tightening up accelerates and the plane dives into the ground. It will get worse with a steeper climb when you add power. It corresponds to too much fin or too little dihedral. Various control actions may bias the turn to favor one side over the other, but will not fix the underlying problem. It will still go either way, once started. The fix is to reduce fin or increase dihedral. The dihedral looks OK. Fin moment can be reduced by reducing fin area, moving the fin forward or moving the CG aft. In this case, reducing fin area would be the preferred choice. This plane has two fins with actually less dihedral than the single. If the fin was enlarged from scale, go back to scale fin. The outer wing panels presumably have the same dihedral as the original, but the central panel is straight and does not contribute dihedral. Low wing planes need more dihedral. Fighters had little dihedral because it inhibits rapid control response. I assume it has two right handed props. The motors put a left roll on the rear motor mounts. This rolls the plane left, putting the left wingtip down. That results in a left side slip which, with the left tip down, is a downward motion. As the torque comes down, the wings will roll more level, reducing the downward slide slip and directing the lift more vertically, so the plane will climb. We are familiar with this mode from the AMA Cub.
I recall Tom Hallman saying that one can effectively reduce the tail fin area by simply adding a vertical gurney strip to the fin (presumably, one each side?). Apparently, this disrupts the airflow in such a way as to reduce its effective area. Worth a try as it may be a much easier solution than a rebuild.
That's Really Cool, Man! You're A Master Modeler For Sure! Read About The Real Thing In Don Lopez's Book, 'Fighter Pilot's Heaven' & Bob Hoover's, 'Forever Flying'. Thank You.
I built a couple of kits that were rubber powered back in the 60's. I enjoyed the video0 and applaud your efforts. Thank you!
That is beautiful! What a great subject for a twin engine aircraft. The flight trim is superb!
Impressive! Rubber power is much harder than it looks. Twin rubber power is already a whole new level! A testament to the build quality and know how on how to use the rubber motors! Thank you for sharing!
Beautiful plane and wonderful flight. Interesting that Wally mentioned his "twin guru Vance" and you mentioned writing a tune. I presume you're both talking about Vance Gilbert. I bring this up because I was involved in music as a life course for many years, and was familiar Vance's music and had friends who would attend his songwriting workshops. IMAGINE HOW SURPRISED I was when I became reacquainted with free flight models a while back (after a hiatus of many decades) only to discover that Vance is also a very highly regarded model builder. A very talented man. Wally is also a very talented man. Loved the birds flying around the plane.
Yessir, we are indeed referring to Vance. Amazing guy indeed. Wally, by the way, was just inducted into the Free Flight Hall of Fame last week. A well deserved honor!
Well I guess you guys must know Tom Hallman pretty well. This twin is beautiful, I never once entertained even the SLIGHTEST doubt in its capacity to get up there. The little red & yellow fella is right up my alley and no mistake. Damn me, but if THAT'S not in trim, then I don't know what is. Thank you Josh and Wally for showing us these fabulous birds. 👍
I've flown alongside Tom, Wally of course knows him very well. Fun stuff!
Thank you RUclips algorithm and thank you for showing us your wonderful aircraft!
The dive-bombing of the bird was a great touch!
Nice plane, flies great. Cool!🛩
What a cool airplane, and a nice open place to fly !
Remember seeing gorgeous early rubber powered planes back in the late 50,s and early 60's. Probably. I built just after WWII
Whats amazing are those birds flying with the models😎
They are trying to annoy the predator in flight as they would for a hawk or eagle.
Very nice model, thanks for sharing
Ya done good!! Exceptionally nice flights.
Beautiful plane, would have liked to see a flight after the last suggested trim modifications. Good to know that even extremely experienced modelers have challenges trimming from time to time.
Exiting and wonderful flights 😊💖
Beautiful! You have a sub. Cheers!!
Beautiful.
So peaceful
Lovely model!
Wow nice design 😊
Amazing second flight. Has he tried swapping the props?
bravo ❗️
A little research on the original XP-82 provides some guidance. It had counter rotating props, with the blades going up in the center. It wouldn't fly going the other way. More to the point for this model, it had two huge four blade propellers, with big fat paddle blades. Big propellers were necessary to transfer the huge power required for higher speed. Propellers act like a forward fin. That must be balanced with tail fin. Note the large strake on this plane.
The simplest solution to the yaw instability would be four blade props. The added weight in a more favorable position would reduce the need for nose ballast. You might see a reduction in the revolution rate, leading to longer motor runs.
noticed you tossed it with left wing down also dihedral improves level flight but on a free flight you do not want a straight line or it will fly away gone forever do you put your id on your planes ? even a little difference in the thrust will cause a turn
Josh I had a tee-shirt from Flying Aces that I got from Tm Schmitt from "Maxecutter" Washington, I miss his frienship.
That’s very cool , I love yer wing man er a bird
Absolutely a beautiful build…the only thing better than a P51…an F82! I bet he has a bunch of interesting aircraft on his shelf at home. Sounds like you had the best mentors as a youngun 😃
The circle seems to be tightening as the power runs down. This could get nasty if you get this plane to go much higher. I think this may be because the propeller is less engaged. The propeller balances the fin. A larger propeller will have an effect similar to a smaller fin.
The unsightly clay blobs on the nose of the plane!
It's a convenient way of tweaking the CG when the plane is still being trimmed out. Once it's dialed it, the clay can be replaced with lead on the inside of the nose openings.
@@joshuawfinn I know. It just always gets me like nails on a chalkboard.
Are you still working on the P51 to go with the Spitfire?
Muito show parabéns.
A tendency to turn right or left with indifference is a yaw divergence, in the extreme case known as a spiral dive. In this case it is stable and limited. In the extreme case, the circle tightening up accelerates and the plane dives into the ground. It will get worse with a steeper climb when you add power. It corresponds to too much fin or too little dihedral. Various control actions may bias the turn to favor one side over the other, but will not fix the underlying problem. It will still go either way, once started. The fix is to reduce fin or increase dihedral. The dihedral looks OK. Fin moment can be reduced by reducing fin area, moving the fin forward or moving the CG aft. In this case, reducing fin area would be the preferred choice. This plane has two fins with actually less dihedral than the single. If the fin was enlarged from scale, go back to scale fin. The outer wing panels presumably have the same dihedral as the original, but the central panel is straight and does not contribute dihedral. Low wing planes need more dihedral. Fighters had little dihedral because it inhibits rapid control response.
I assume it has two right handed props. The motors put a left roll on the rear motor mounts. This rolls the plane left, putting the left wingtip down. That results in a left side slip which, with the left tip down, is a downward motion. As the torque comes down, the wings will roll more level, reducing the downward slide slip and directing the lift more vertically, so the plane will climb. We are familiar with this mode from the AMA Cub.
I recall Tom Hallman saying that one can effectively reduce the tail fin area by simply adding a vertical gurney strip to the fin (presumably, one each side?). Apparently, this disrupts the airflow in such a way as to reduce its effective area. Worth a try as it may be a much easier solution than a rebuild.
@@crashrr2993 Sounds similar in effect to a spoiler. Worth a try.
These birds don’t like competition
WOW!!!
We're are you from
That's Really Cool, Man! You're A Master Modeler For Sure! Read About The Real Thing In Don Lopez's Book, 'Fighter Pilot's Heaven' & Bob Hoover's, 'Forever Flying'. Thank You.
If that bird had guns you would have been in trouble.