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Author Topic: Is the Cavalier NOS 30 legal?  (Read 1504 times)

Offline pmackenzie

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Is the Cavalier NOS 30 legal?
« on: April 14, 2022, 11:01:40 AM »
I tried to search, but could not find this info.
Full fuse version, not the profile, if that makes any difference :)

Thanks,

Pat MacKenzie
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Offline Matt Colan

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Re: Is the Cavalier NOS 30 legal?
« Reply #1 on: April 14, 2022, 11:11:53 AM »
I tried to search, but could not find this info.
Full fuse version, not the profile, if that makes any difference :)

Thanks,

Pat MacKenzie

It is classic legal and N30 legal
Matt Colan

Offline Fred Quedenfeld jr

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Re: Is the Cavalier NOS 30 legal?
« Reply #2 on: April 14, 2022, 11:28:42 AM »
the PAMPA rules indicated that I must provide proof how do I get a set of plans dated before 1969?
Fred Q

Online Dan McEntee

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Re: Is the Cavalier NOS 30 legal?
« Reply #3 on: April 14, 2022, 12:05:23 PM »
the PAMPA rules indicated that I must provide proof how do I get a set of plans dated before 1969?
Fred Q

   I think proof of the design would only be required if there was any kind of question or protest. People often say that they built this or that, or modified a design, but say so isn't enough. You need documentation. John Simpson designed the Cavalier back in the late 1960's and it has has been proven by him and others that it existed. There is probably other written documents and photographic proof also. I got a set of plans from John way back in the mid to late 1990's I think and they are dated. I think PAMPA has the Cavalier in their plans listing and is shown as Classic legal. In other words, it has been around long enough that is it common knowledge that it is legal. Now, having said that, I have a set of plans for a .60 size green box Nobler. If I ever get my act together and get it built, and show up at VSC with it, I better have the plans and other documentation with me to prove it. I met the gentleman that built the model at the SIG contest one year, and he had it with him, and I got to hold the original model in my hands. He had other photographic proof also. Not only that, but Jim Lee was there, and when he heard what we were talking about and saw the model, he jumped up from his perch in the grass and declared that he remembered seeing that airplane at a contest in 1964 I think it was. He got home, found a photo of it dated back then, and sent me a copy. There was another guy named Jan Rummery, I think, who we often saw there, who hand draws model plans and restores old plans, and he remembered seeing the model back in the day also. The builder was Jerry Jack, I think and he got with Jan and described how he used simple high school drafting procedures (which were commonly taught in high schools back then) to enlarge the kit plan, so Jan drew up a fresh set of plans to the existing model's dimensions and included the affidavits from himself and Jerry Jack on it's history and also included a copy of the photo that Jim Lee had provided. That's quite a bit of proof and evidence but I'll bet there are some models put there with quite a bit less than that and have been allowed in contests. If you have a slightest bit of doubt and no proof, don't build the model or at least don't enter it in a Classic contest.  I'll play the devils advocate here again and say that I think the N-30 class is a joke anyway, not in the spirit of flying vintage model aircraft, and needs to be eliminated . Including N-30, that makes 4 classes of vintage C/L stunt, which are OTS, Classic, Super 70's, and N-30. There really isn't enough participation to warrant all of those. The question gets asked all the time, is this model or that N-30 legal by people who are just looking for some sort of edge and get the most "modern" design they can to fly in a "vintage" class of competition.. I think most would agree that just about anything designed after 1980 is as competitive in modern stunt, at least in a regional level, as just about any other design coming off the drawing board today. A perfect example is what Joe Gilbert can do with a Ringmaster. Joe and some other can fly the drawing boards or the boxes that the kits come in better than the rest of us can fly our best airplane! The airplane doesn't make the pilot fly well, the pilot must take advantage of the airplane and learn to fly it well. So in short, I say eliminate N-30, and put a cut off date for super 70's at December 31, 1979, just like the powers that be at the time were smart enough to do and decided the cutoff for Classic at December 1969. You will have three distinct eras of the evolution of C/L stunt with more than enough designs to keep the fewer and fewer of us who participate happy and occupied.
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Online Brent Williams

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Re: Is the Cavalier NOS 30 legal?
« Reply #4 on: April 14, 2022, 12:06:35 PM »
The Cavalier is very well known and a very commonly used plane in the classic ranks.  If a CD were to give you any grief over that plane, then they clearly don't know the event that well.
Laser-cut, "Ted Fancher Precision-Pro" Hard Point Handle Kits are available again.  PM for info.
https://stunthanger.com/smf/brent-williams'-fancher-handles-and-cl-parts/ted-fancher's-precision-pro-handle-kit-by-brent-williams-information/

Offline pmackenzie

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Re: Is the Cavalier NOS 30 legal?
« Reply #5 on: April 14, 2022, 01:27:35 PM »
It is classic legal and N30 legal

Thanks Matt.

Now question #2, in two parts.

Do I need to fix this stab tilt, and if so, how?

This is a Tom Morris-built RTF model, I picked it up second hand but never flown.
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Online Fred Underwood

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Re: Is the Cavalier NOS 30 legal?
« Reply #6 on: April 14, 2022, 01:53:36 PM »
Is the stab tilt from fuse twist?  The rudder looks in line with the stab and gives the appearance that the fuse has twisted.  How is the model finished?
Fred
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Offline pmackenzie

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Re: Is the Cavalier NOS 30 legal?
« Reply #7 on: April 14, 2022, 02:17:13 PM »
It does look like the whole fuse is twisted from the wing back.
If anything, the rudder is even more tilted than the stab, but that could also be from how the airfoil/rudder offset was sanded into it exaggerates it a bit.


Pretty sure it is a dope finish.

There is also a crack in the fuse right at the flap hinge line, which happened in shipping and is why the original owner never flew it.
I though it would be an easy fix: cut a hole in the bottom and double it up on the inside.
But the fuse is made sort of like a stick and tissue free flight model, with lots of little sticks in there, so no way to simply add doublers on the inside.

On the plus side - it looks pretty good, and is nice and light. 27 ounces as it sits (no motor or fuel tank).

(I have the motor, tank and spinner. They are just not in the model at the moment. Brodak 40)
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Offline RC Storick

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Re: Is the Cavalier NOS 30 legal?
« Reply #8 on: April 14, 2022, 02:45:31 PM »
It does look like the whole fuse is twisted from the wing back.
If anything, the rudder is even more tilted than the stab, but that could also be from how the airfoil/rudder offset was sanded into it exaggerates it a bit.


Pretty sure it is a dope finish.

There is also a crack in the fuse right at the flap hinge line, which happened in shipping and is why the original owner never flew it.
I though it would be an easy fix: cut a hole in the bottom and double it up on the inside.
But the fuse is made sort of like a stick and tissue free flight model, with lots of little sticks in there, so no way to simply add doublers on the inside.

On the plus side - it looks pretty good, and is nice and light. 27 ounces as it sits (no motor or fuel tank).

(I have the motor, tank and spinner. They are just not in the model at the moment. Brodak 40)

You can steam it out
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Offline pmackenzie

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Re: Is the Cavalier NOS 30 legal?
« Reply #9 on: April 14, 2022, 03:00:51 PM »
You can steam it out

I can try that.
Do you think it might tend to spring back to twisted if it sits out in the sun, or in a hot car?

I also thought of cutting the bottom block off, re-doing the internal diagonal pieces on the bottom with it blocked straight, then gluing the bottom block back on.
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Online Ken Culbertson

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Re: Is the Cavalier NOS 30 legal?
« Reply #10 on: April 14, 2022, 03:57:15 PM »
I can try that.
Do you think it might tend to spring back to twisted if it sits out in the sun, or in a hot car?

I also thought of cutting the bottom block off, re-doing the internal diagonal pieces on the bottom with it blocked straight, then gluing the bottom block back on.
I like your Plan "B" better.  The internal bracing on a fuselage is pretty steam resistant IMHO.  I have done it (take off the bottom) on one plane, and it worked.  Cut off the bottom block *carefully* and used a razor saw to separate the formers on one side about 1/4" from the side.  Twisted it into alignment then reglued the formers.  You could use some steam here to relax the wood in its new position.  Had to sand the formers flush then on with the bottom.  Excellent place to put a trim line after you are finished.  If your pushrod will let you, you can add some resistance with "lower left to upper right" brace.

One other method I have used successfully when the tilt was as small as yours was to slice in about an inch below the stab on the low side all the way to the first former in front of the stab.  Jack it up on the low side and fill in the gap with a balsa wedge.

The then there is plan "D" - tweak the elevator; or, better yet just tell everybody it is stab tilt so that it will fly in circles. LL~

Ken
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Offline Matt Colan

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Re: Is the Cavalier NOS 30 legal?
« Reply #11 on: April 14, 2022, 04:00:46 PM »
It does look like the whole fuse is twisted from the wing back.
If anything, the rudder is even more tilted than the stab, but that could also be from how the airfoil/rudder offset was sanded into it exaggerates it a bit.


Pretty sure it is a dope finish.

There is also a crack in the fuse right at the flap hinge line, which happened in shipping and is why the original owner never flew it.
I though it would be an easy fix: cut a hole in the bottom and double it up on the inside.
But the fuse is made sort of like a stick and tissue free flight model, with lots of little sticks in there, so no way to simply add doublers on the inside.

On the plus side - it looks pretty good, and is nice and light. 27 ounces as it sits (no motor or fuel tank).

(I have the motor, tank and spinner. They are just not in the model at the moment. Brodak 40)

Steam, or I’ve even used a heat gun and get it as hot as you can stand and twist the fuselage. I have a United that was about as crooked as can be and steam and heat guns got all the warps out, including a twisted fuse creating the crooked stab
Matt Colan

Online Dan McEntee

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Re: Is the Cavalier NOS 30 legal?
« Reply #12 on: April 14, 2022, 04:31:05 PM »
Thanks Matt.

Now question #2, in two parts.

Do I need to fix this stab tilt, and if so, how?

This is a Tom Morris-built RTF model, I picked it up second hand but never flown.

    There is another way to structurally adjust it if you don't mind touching up the finish on the bottom of the model. About half way back on the bottom of the fuselage, make a diagonal cut with a razor saw, about 50 to 60 degrees going from the right side of the fuse back to the left side of the fuselage. Just go as deep as the bottom sheeting or block. Take your time and make a nice, straight, clean cut. The take a narrow section of 1/64" and/or 1/32" ply wood, and bevel one edge. Slightly twist the fuse and insert the 1/32" plywood shim, and eyeball the model from the back again and see how far it moved. If that shim was enough ( And judging from the picture it won't take much) stop there and run some thin CA carefully along the resulting seam. If still happy run some masking tape along both sides of the seam and start shaving and sanding the shim down the the sheeting level. When happy there, touch up the paint. I used to do this in my sailplane days on fuselages, and it will work on sheeted foam wings also that may have had a warp built in the wing or you want and need to induce some wash in on both wing tips. The neat thing about doing it on the fuselage is that if you need to goo quite a ways to get it square, you can "stack" up two or three of these shim sections about an inch apart to get the required twisting action, and when locked in with C/A, it will stay. You just have to wo rk carefully. From the picture, it doesn't look too critical and might be worth a test flight just to feel it out.
  As far as the crack, you may have enough room to work in some finish cure epoxy and some fiberglass in the inside, laid over the area where the crack is. Put a drop of thin CA in the crack first and let it work it's way in, then glass over it.
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Online Fred Underwood

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Re: Is the Cavalier NOS 30 legal?
« Reply #13 on: April 14, 2022, 06:07:55 PM »
I would use steam, or a damp towel on the fuse and an iron.  I assume that the model was built straight, and a warp/twist developed with storage.  A bit of pressure on the stab on one side, or uneven heating could have twisted it.  If built straight, it shouldn't be that difficult to straighten and keep, straight.  Weight the stab high side near the fuse and put a block under the low side near the fuse and then have both hands to work on the fuse.  If you keep the pressure near the fuse, you will straighten the fuse instead of warping the stab.  When done flying, keep it is slight reverse twist with the weight and block for several outings and it should stay.  If you loosen and reglue the stab, the fuse and rudder will still be off.  If that fails, you can cut and refinish :-)
Fred
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Online Ken Culbertson

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Re: Is the Cavalier NOS 30 legal?
« Reply #14 on: April 14, 2022, 06:23:12 PM »
I seem to be missing something with the steam method.  Wings yes but I have never successfully steamed a fuselage.  Next time I will give it another try. y1
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Online Brett Buck

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Re: Is the Cavalier NOS 30 legal?
« Reply #15 on: April 15, 2022, 10:45:24 AM »
I seem to be missing something with the steam method.  Wings yes but I have never successfully steamed a fuselage.  Next time I will give it another try. y1

   The boiling water and towels even work on my fuselage, built *much more rigid* than most. I also don't think there is any need to sand off the paint or even disrupt the finish.

       Brett

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Re: Is the Cavalier NOS 30 legal?
« Reply #16 on: April 15, 2022, 10:48:05 AM »
Thanks Matt.

Now question #2, in two parts.

Do I need to fix this stab tilt, and if so, how?

This is a Tom Morris-built RTF model, I picked it up second hand but never flown.

    Yes you need to fix that. While you are at it, check for any "skew" between the wing and stab (that is, the hinge lines are not parallel). Even a little bit of skew could be worse than that much tilt.

   Brett

Online Ken Culbertson

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Re: Is the Cavalier NOS 30 legal?
« Reply #17 on: April 15, 2022, 12:35:42 PM »
   The boiling water and towels even work on my fuselage, built *much more rigid* than most. I also don't think there is any need to sand off the paint or even disrupt the finish.

       Brett
Maybe it is my technique.  My experience has been that unless you could in some way bet the wood "wet" that the straightening didn't last long.  I will try your method if I ever screw up another one. when I screw up the next one.

Ken
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