Author Topic: Starting a .46 size Fancherized Twister (Read 2069 times)

Mike Griffin · « **on:** September 23, 2023, 11:23:15 AM »

Thought I would build a .46 size Fancherized Twister. Will try to post pictures as build progresses.

Mike

Walter Hicks · « **Reply #1 on:** September 24, 2023, 07:29:56 PM »

Mike I think that is a good idea and should work well. Keep us posted.

Mike Bush · « **Reply #2 on:** September 25, 2023, 09:56:46 AM »

Mike,
What are the specs on the 46 sized Fancherized Twister. The ribs look to be laser cut ,who was the supplier and who has plans?
Thanks
Mike B

Tim Wescott · « **Reply #3 on:** September 25, 2023, 11:53:06 AM »

I second the "how big is it" question -- I have a regular-sized, but exceptionally porky, Fancherized Twister that flies on a 46LA, but somehow I don't think that's what you mean here.

realSteveSmith · « **Reply #4 on:** September 25, 2023, 12:44:05 PM »

Quote from: Tim Wescott on September 25, 2023, 11:53:06 AM

I second the "how big is it" question -- I have a regular-sized, but exceptionally porky, Fancherized Twister that flies on a 46LA, but somehow I don't think that's what you mean here.

I asked Mike about this on FB. He said he was using the Fancherized Twister plan drawn by Bob Kruger....but it was enlarged to 112%

Mike Griffin · « **Reply #5 on:** September 25, 2023, 06:35:41 PM »

Quote from: realSteveSmith on September 25, 2023, 12:44:05 PM

I asked Mike about this on FB. He said he was using the Fancherized Twister plan drawn by Bob Kruger....but it was enlarged to 112%

That is correct Steve. The ribs were sent to me by a friend who had an extra set. I do not know where he had them cut. This is a kind of a "one of" build for me. I have built several fancherized Twisters in the past. When you blow the plans up to 112%, you end up with a 54 5/8" Wingspan. I am progressing slowly on the build and should have some more pictures in a couple of days.

Mike

Mike Bush · « **Reply #6 on:** September 25, 2023, 08:41:53 PM »

Mike,
If my math is correct, 112% of 510 is about 640 sq in.
Mike B

Mike Griffin · « **Reply #7 on:** September 25, 2023, 09:28:28 PM »

Quote from: Mike Bush on September 25, 2023, 08:41:53 PM

Mike,
If my math is correct, 112% of 510 is about 640 sq in.
Mike B

Have not done that math, so could be.

Mike

Dan McEntee · « **Reply #8 on:** September 25, 2023, 09:36:38 PM »

Using L.A.R engineering (Looks About Right) you could just add a rib bay to each wing, make the trailing edge 1/4" wider, do the fuselage stretch per the Fancher mods, and be about in the same place. I did that with a Twister based profile stunt/scale model and still flies well with a LA.40. I've gotten 520ish scores in stunt with it and first and second place trophies in profile scale with it.
Type at you later,
Dan McEntee

Ken Culbertson · « **Reply #9 on:** September 25, 2023, 09:58:31 PM »

Quote from: Mike Bush on September 25, 2023, 08:41:53 PM

Mike,
If my math is correct, 112% of 510 is about 640 sq in.
Mike B

More like 571. Bout right for a LA46. With a stiff fuselage an F2 or F3 Twister should be a winner. I upsized mine too and it flew absolutely great on a Cobra 2826 which is just a little bit stronger than a LA46. It was Fancherized + 4" added to wingspan and 2" added to stab span.

Ken

Mike Bush · « **Reply #10 on:** September 26, 2023, 01:59:13 AM »

Quote from: Ken Culbertson on September 25, 2023, 09:58:31 PM

More like 571. Bout right for a LA46. With a stiff fuselage an F2 or F3 Twister should be a winner. I upsized mine too and it flew absolutely great on a Cobra 2826 which is just a little bit stronger than a LA46. It was Fancherized + 4" added to wingspan and 2" added to stab span.

Ken

Ken ,
It has been my understanding that when scaling up or down you use the square root of the wing area. In this case 510 sq in. Square root is 22.583. 112% of that is 25.292. 25.292 x 25.292= 639.68. If I am wrong and that is not correct I would gladly be corrected. That is the formula that I have used when scaling up and down and seems to be what others have used before. A 106% enlargement would be 573 sq in. 640 sq in is a very large .46 size plane in todays world. I know that back when ST .46 were used that was not that unusual.

Mike B

Ken Culbertson · « **Reply #11 on:** September 26, 2023, 06:35:34 AM »

Mike, Just because I have never heard that does not mean it is not true. It does make sense since you are stretching both dimensions that the change in area would be the square of the change. Barring further evidence, I stand corrected.

It appears I did basically the same thing Dan did to make it more 46ish. My scores with it were all over 500 in profile with no appearance points so you can tell it will not be a "looser" with those mods. I am not sure I would stretch the nose moment. With the added weight of the battery and electronics I came out nose heavy on mine with the kit nose. It was designed for a Fox 35 which was pretty light. The LA46, not so much plus the extra fuel. As typical on some electrics it flew well nose heavy. Just for reference it was 1 1/4" from the LE.

My mods, and Dan's, listed earlier probably added only about 40sq" or so, yours are adding over 100 so that may change things a bit as to the nose. You can always shorten it. Making it longer is not as much fun. What are you doing to the profile shape? Stock Twister?

Ken

Mike Griffin · « **Reply #12 on:** September 26, 2023, 07:35:07 AM »

What are you doing to the profile shape? Stock Twister?

Ken I was not sure if you meant this question for me or Mike Bush so I will answer it. The fuselage shape will be the Fancherized shape. I just think it is more pleasing to the eye than the original shape but that is just a matter of opinion. One thing I forgot when I gave the wing span, was the 1/4" thick wing tips so that will make the total span 55". Fuselage length is 35".

Mike

Mike Bush · « **Reply #13 on:** September 26, 2023, 10:45:04 AM »

Mike,
When I ran the #s for the 112% enlargement I was using a ad that I pulled up for the twister from sig which said 510 sq in.
I then looked up Bob Kruger plans for the Fancherized Twister and it says 490 sq in. 112% enlargement of 490 is 614.593 sq in. I look forward to seeing how this turns out and what you think of it when finished and flying. Are you going to use a LA 46 or Electric for power? I have noticed in some of your build logs before that you typically use a magnetic building board. Did you do the same with this wing?
Mike Bush

Mike Griffin · « **Reply #14 on:** September 26, 2023, 02:09:31 PM »

Quote from: Mike Bush on September 26, 2023, 10:45:04 AM

Mike,
When I ran the #s for the 112% enlargement I was using a ad that I pulled up for the twister from sig which said 510 sq in.
I then looked up Bob Kruger plans for the Fancherized Twister and it says 490 sq in. 112% enlargement of 490 is 614.593 sq in. I look forward to seeing how this turns out and what you think of it when finished and flying. Are you going to use a LA 46 or Electric for power? I have noticed in some of your build logs before that you typically use a magnetic building board. Did you do the same with this wing?
Mike Bush

Mike I have a new OS LA .46 I am going to use for power. I did use the magnetic building board to build this wing. I have several other jigs but when the wing design with allow, I will use the magnets. It is easy and the wings always come out straight. I need to post some more pictures of the wing build and will just as soon as I get the chance.

Mike

Dwayne Donnelly · « **Reply #15 on:** September 26, 2023, 04:21:45 PM »

Looking good Mike, this thing would look way cool with some half ribs.

Mike Griffin · « **Reply #16 on:** September 26, 2023, 04:58:56 PM »

Quote from: Dwayne Donnelly on September 26, 2023, 04:21:45 PM

Looking good Mike, this thing would look way cool with some half ribs.

Wait till the next picture. They are there.

Mike

Perry Rose · « **Reply #17 on:** September 26, 2023, 07:50:26 PM »

I figure 571.2 sq. in. wing area.

Mike Griffin · « **Reply #18 on:** September 27, 2023, 01:01:25 PM »

Here are some more wing pictures and some dimensions for the mathematicians to figure out wing area.

Wing span - 55"
Constant chord wing - Chord is 9 3/8"
Flaps (inboard and outboard) 26 3/4" long
Flaps Inboard Chord - 2 1/2"
Flaps Outboard Chord - 1 3/8"

Mike Griffin · « **Reply #19 on:** September 27, 2023, 01:05:31 PM »

I still have a lot of sanding to do. Center and trailing edge sheeting is 3/32 and I used a Tom Morris 4" phenolic suspended bellcrank.
I will post some pictures of the fuselage build and empennage as I progress through those stages.

Mike

Ken Culbertson · « **Reply #20 on:** September 27, 2023, 01:43:25 PM »

I come up with something like 622sq". Seems a shame to have to hollow out those beautiful lightening holes for the leadouts. Nice job.

Ken

Mike Griffin · « **Reply #21 on:** September 27, 2023, 01:57:56 PM »

Quote from: Ken Culbertson on September 27, 2023, 01:43:25 PM

I come up with something like 622sq". Seems a shame to have to hollow out those beautiful lightening holes for the leadouts. Nice job.

Ken

Thank you Ken. I agree about the lightening holes but do not want the lead outs rubbing against wood.

Mike

Mike Griffin · « **Reply #22 on:** September 27, 2023, 02:32:47 PM »

Here are the fuselage templates. I glued the cutouts from the plan to hard 1/16 balsa for templates and put them together for this shot. The fuselage from front to back of rudder is 39".

Ken Culbertson · « **Reply #23 on:** September 27, 2023, 02:34:02 PM »

Quote from: Mike Griffin on September 27, 2023, 01:57:56 PM

Thank you Ken. I agree about the lightening holes but do not want the lead outs rubbing against wood.

Mike

I learned the hard way that you need to position the adjustable guide all the way forward and trim, then move it all the way to the rear and trim again. Not much left on some of them when you put a 4" crank in a plane designed for a 3".

How much flap are you thinking? Mine ended up 30/45. I started out 45/45 but it was stall prone in a really tight corner. When I reset the ratio's it flew great.

I love Twisters, I hope yours works out!

Ken

Mike Griffin · « **Reply #24 on:** September 27, 2023, 03:09:17 PM »

Quote from: Ken Culbertson on September 27, 2023, 02:34:02 PM

I learned the hard way that you need to position the adjustable guide all the way forward and trim, then move it all the way to the rear and trim again. Not much left on some of them when you put a 4" crank in a plane designed for a 3".

How much flap are you thinking? Mine ended up 30/45. I started out 45/45 but it was stall prone in a really tight corner. When I reset the ratio's it flew great.

I love Twisters, I hope yours works out!

Ken

I hope it works out too Ken. It is a lot of fun playing with this. I have not thought about the flap throw yet. What you did sounds about right to me. I hate carving out those ribs too but it is just something that has to be done. I just hope she will fly decent when I am through.

Mike