Author Topic: Twister/OS Max 40FP (Read 8501 times)

David M Johnson · « **on:** January 07, 2012, 10:52:25 AM »

Looking for confirmation that this is a decent combination. This plane has NOT been "Francherized" and due to the fact that I'm finishing an already started project for another flier it will remain a standard out of the box Twister.
I'm looking for a Saturday, show up and fly, easy to operate plane.
Comments please.

David Johnson

Greg L Bahrman · « **Reply #1 on:** January 07, 2012, 11:08:32 AM »

I had a Enya 35 in mine. It was stock and flew fine. OS 40FP should be fine.

Mark Scarborough · « **Reply #2 on:** January 07, 2012, 11:34:27 AM »

I have had two 40FP powered twisters, they fly great when trimmed.
which FP is it,, the older one or the newer one?
the newer ones tend to be a bit more sensitive, but totally managable.
my best luck came with an APC 11.5 x 4, 10 % nitro, 22% oil ( 50 castor 50 synthetic) though on warmer days I did add a bit more castor.

I seem to recall a launch rpm around 9800, but a quick search will get you lots of info about the FP..

David M Johnson · « **Reply #3 on:** January 07, 2012, 11:53:56 AM »

Looks to be a newer FP, plain bearing, muffled.
David Johnson

richardhfcl · « **Reply #4 on:** January 07, 2012, 12:29:27 PM »

David,

The Sig Twister with an F.P. 40 or clone are the most fun and most common set ups out at our field
at Ned Brown Meadow. Although there are planes of all shapes and sizes, hands down the set up
that everyone seems to come back to is the Twister with the F.P. 40. An F.P. or L.A. 25 is large enough
to power the plane, but not in all weather conditions, so why tempt fate and Mother Nature? Go with
the 40.

Enjoy!

rustler · « **Reply #5 on:** January 07, 2012, 01:26:06 PM »

Quote from: Mark Scarborough on January 07, 2012, 11:34:27 AM

..twisters, they fly great when trimmed.

Any advice on trim for std. Twister? e.g. c.g.?, flap/elev ratio?, engine offset?, etc.?

Dan McEntee · « **Reply #6 on:** January 07, 2012, 04:08:34 PM »

I would say it's more than decent, it's an EXCELLENT combination!!

One of our flying buddies here in the St. Louis area by the name of John Garrett flew this combination from beginner all the way to expert. And I mean THE SAME PLANE!!! He probably wore out 3 engines, and had a few crash repairs, but it was the same airplane, a bone stock SIG twister, and FP.40. Mark already posted the best engine set up, but you may want to add a head shim if it still wants to run away, or the break is too hard. I think it's best, or at least I prefer, the controls to be smooth, long, and slow, and properly balanced you don't need a lot of deflection for the model to turn a good corner. Just try to build it straight as possible. I have a Twister that I did the Fancher modifications to,made it a D tube wing with cap strips, and added some wood here and there to make it look like a Shark .45. I used all the kit wood, (which had ribs that were cut from barn siding I think (wood was so hard I had to trim them with a band saw to allow for the cap strips and sheeting) and it weighs in the high 40 ounce range and still flies well. Don't sweat the weight too much. The planes carries extra weight well, so just please yourself with the finish.
Good luck and have fun,
Dan McEntee

John Fitzgerald · « **Reply #7 on:** January 07, 2012, 06:35:42 PM »

I have a Fancherized Twister that I built probably 12 years ago. Originally powered by a OS .30-S. Flew decent in calm weather. After a crash repair, changed to a unmodified OS .35 FP with Neumann C/L venturi. It flies very well. Too fast if the engine goes a little lean. In my experience, these engines have a tendency to "run away". Have to launch in a fast four cycle to try and prevent it. I have an ummodified Tower .40 with Neumann C/L venturi on another profile. Similar engine, same characteristics. On another model of my own design, but similar to a Twister, I have a Neumann modified Tower .40. That is one sweet engine. Huge amount of power, and turns a 12x5 W prop in the 9,000 range, without ever running away. Don't know if those are still available.

Larry Cunningham · « **Reply #8 on:** January 08, 2012, 12:14:49 PM »

I think the stock Twister works better with an OS .40 FP than with the original Fox .35 setup. The FP is smoother and heavier, of course; the Twister is a bit calmer and smoother performer with its CG moved forward slightly, still completely capable of a fine pattern.

I do recommend having the rudder flat, without the large offset shown on the plan. And the stock wire gear setup is pretty much cosmetic stuff, not durable at all. Lots of people use an aluminum gear with much more happiness. The plan's tail wheel is also wimpy and will not last long. Do something with that.

It's very easy to add adjustable leadouts and a tip weight box with the squared off wing tips. And some people like to add half ribs or even plank the leading edge, neither of which are necessary, the Twister wing works just fine as built per plan.

The older FP .40s are the best for stunt, in my opinion, but the later one also works - newer one has an ABN construction, and sometimes the nickle plating will peel. I suggest using a venturi off the OS .20/.25, it's great for stunt. We really liked the old wooden Rev-up extra wide series props, in fact, the 11x6EW was my choice. These props are flatter than indicated, and the 11" prop loads the engine a bit, which works. Some people add a second head gasket. Our engines were sweet running in the 8500 RPM range, using 10% nitro and 22% oil (half castor) fuel.

The Twister design is one of the best simple profile ships and a great model to learn with and compete with.

L.

"Sometimes something worth doing is worth overdoing." -David Letterman

Clayton Berry · « **Reply #9 on:** January 15, 2012, 04:32:06 AM »

No side thrust or even rudder offset on my last two (had a line break on 2nd flight of #2- no pictures, and very little oil for the kid to deal with on repair of the pieces). I have a nice Tower that I use an APC 10.5 / 4.5 with. Tom Hampshire turned me onto the idea back when I was trying to get a K&B 40 to operate with a big 11/6 wooden something.

My experience is that the Tower likes to rev. Let it. 11k or so? The K&B liked to rev too, but was heavier than a brick. Got one for sale.

And put some wingtips on your Twister. Nothing uglier than a stock Twister. Well, except maybe my brown Chrysler mini van. But from the driver seat I couldn't see that much of it. Had a great AM radio. Ten speakers, if I recall.

I've built three. Extended the fuse about 1.5 inches, increased the stab/elevator until it looked about right, and did away with the butt-ugly fin/rudder. And yes, there is something satisfying about carving a nice set of wing tips with your 40 year old Wilkro razor plane. Just don't ever try to shave with a double edge blade in what passed as a razor back then. For use on balsa only.

Dennis Moritz · « **Reply #10 on:** January 15, 2012, 07:12:52 PM »

Here's mine. Used a stock Fp40 with two head gaskets, enya3 plug, 10.5x4.5 apc. Powermaster 22%5%(50/50) fuel. Tongue muffler with a lot of holes. Engine ran a wet 2-stroke that broke into a faster 2-stroke. After it was trimmed correctly. Very nice plane. I used the half ribs. Adjustable lead outs, tip weight box. In our club we've used quite a few of the newer engines (circa 1985?). I prefer them because they tolerate an over lean run. Which happens to the best of us. Always feel antsy about cast iron pistons running hot. I have seen the nickel peal. In my experience these are well used and abused, cooked at high heat by RC malcontents.

John Fitzgerald · « **Reply #11 on:** January 15, 2012, 08:08:01 PM »

My modified Twister has extended tail, 53 inch span, and 1/64 ply on the fuse. It weighs 44oz rtf without fuel. I know, kind of heavy, but the .35 FP flies it well slinging a 11-6 Zinger wood prop.

Bill Heher · « **Reply #12 on:** January 15, 2012, 09:52:10 PM »

I have flown mine ( used/porky ) Fancherized with an OS .FP .35, FP 40,and now it has an LA.46. All flew it well, the FP .40 worked well, but since I pounded my Tutor II ARFS I had the LA .46 available - best engine yet on that plane.

Use the . 40, low pitch( 11x5,11.5x5 or 4)' and let him your friend fly the covering off it!!

David M Johnson · « **Reply #13 on:** January 16, 2012, 05:25:31 AM »

Thanks one and all, Bill I saw you at Estaban Park Sat and saw you fly the green machine. I really was impressed the way it flew
David Johnson

dankar · « **Reply #14 on:** January 16, 2012, 11:56:46 AM »

Fine combo. My first with FP-.35 that I still have. Others with FP-.40 nice combo.
Dan

David M Johnson · « **Reply #15 on:** January 16, 2012, 03:44:10 PM »

No covering or Paint, but with 1/2 oz tip weight and motor with wheels 36 oz.
David Johnson

ChrisSarnowski · « **Reply #16 on:** January 16, 2012, 04:09:18 PM »

I had a great time learning on a well used 2nd hand fancherized twister with an FP 40 on it.
I think it sucked in a bug, stopping the engine at a bad place in a maneuver, and was rekitted.
Fun while I had it!

-Chris

David M Johnson · « **Reply #17 on:** January 18, 2012, 02:52:59 PM »

And just so anyone thinks I never get do here is photos. I was able to lengthen the fuse 1.5 inches and I did add a doubler to the nose to help dampen vibrations. I also am including a photo of the paint scheme. courtesy of The Museum of Flight at Boeing Field in Seattle.

David M Johnson · « **Reply #18 on:** January 18, 2012, 02:54:14 PM »

And....

Bill Heher · « **Reply #19 on:** January 18, 2012, 06:11:10 PM »

The ."Green MacHine" as you named it may be the one Dan speaks of - he gave it to me!

Author Topic: Twister/OS Max 40FP (Read 8501 times)

ChrisSarnowski