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Sport Twin Pics

Old 06-20-2011, 02:04 PM
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jim19
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Default Sport Twin Pics

There is a thread for scale twin pics with some excellent models shown, so here's one for those of us who fly sport twins. So with this in mind, I'll start with some pics of my newest twins.

This is my Gemini GT-25. It is a .25 size twin with a 59.5" wingspan, powered by two GMS .25s. It weighs 6.5 lbs. minus fuel (8 oz. fuel tanks installed). It is an excellent flying airplane and is easy to handle, even on one engine. It has flaps which can be extended to 80 degrees with no tendency for the plane to balloon.
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Old 06-20-2011, 02:11 PM
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jim19
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Default RE: Sport Twin Pics

This is the Gemini GT-40. Is the .40 size version of the Gemini. It has a wingspan of 66.5 inches and a weight of 8.5 lbs minus fuel. This plane carries 8 oz. fuel tanks, but can accomodate 10 oz. tanks. It has SpringAir retracts and looks great in the air. Like the GT-25 it is an excellent handling airplane just in a larger format to accomodate the retracts. This twin is fast with a top speed in the 120 mph range but with the flaps, it slows down nicely for smooth landings.
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Old 06-20-2011, 02:39 PM
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Prop_Washer2
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Default RE: Sport Twin Pics

Both look good..!! Makesme want to get my Twin Star receiver installed, bird is new with two ASP .25's flying. I also have the following all NIB; Hobby Barn 80" OV-10 Bronco
Seagul Dual Ace, 72" E-2C Hawkeye, 55" C-119 Boxcar, CMP Nitro C-160 Transall, CMP Nitro 93" Cessna 310, CMP Nitro P-82, and a CMP Nitro Cessna 421. I feel like a damn collector, i.e. "Buyer not a Flyer"...

Hey I just noticed, your right up the street from me...hah hah...
Old 06-21-2011, 03:01 AM
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AncientCityFlyer
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Default RE: Sport Twin Pics

Im interested in purchasing a Gemini GT-40 but cannot find a working link to the mfg. Do you have a working link or web-site? Thanks ACF
Old 06-21-2011, 09:50 AM
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jim19
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Default RE: Sport Twin Pics

The AeroCrafts website is currently down but the Gemini's are still available. You can contact Jim at [email protected] for more info until the website is back up and running.
Old 06-21-2011, 11:07 AM
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Default RE: Sport Twin Pics

I have my little TwinStar with two cute little OS FS-26 Surpass engines on it.  behind it is my venerable Combat Airmadillo Twin sporting two old OS 40FP engines.




Old 06-21-2011, 02:46 PM
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Ed_Moorman
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Default RE: Sport Twin Pics

A twin Airmodillo! I had one of those. The only matching engines I had were 2 Fox .50s with tuned pipes. It was nose heavy, but a blast to fly. I had to run a rod between the fins or they would flutter. With one engine out, it would do great flat spins-and recover.

Next is my old customized Twin-Air 45 with 2 Magnum .52XLS. Good flying airplane.



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Old 06-21-2011, 03:03 PM
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Default RE: Sport Twin Pics

Here's a canard twin designed by my buddy Carl "Flaps" Laffert. We used Magnum .30 4-strokes and they didn't run reliably enough to make flying fun.

Next is my Outsider, a modified Goldberg Tiger 2, designed to test out thrust on the engines to counter the yaw from an engine out. Two OS .46AXs. Weighed 8.5 lbs. After a couple of trim and familiarization flights, I began the test. I filled one tank full and the other 1/3-1/2 full. I took off and flew around doing maneuvers. My feeling was that is you shut one engine down, you know when it's coming and can get ready with the rudder correction. My way, I never knew when the engine would quit. I did try both engines this way and the out thrust works great. Virtually no yaw with a dead engine. One photo has me landing with an engine out.

If you are curious, I used 8 degrees of out thrust on each engine (give or take a little). If you do the math, the cosine of 8 deg. is .99027, which means you are losing less than 1% of your forward thrust with 8 deg. out thrust. People always asked if I lost a lot of speed from it and the answer is "No." You also get enough side thrust to counter the yaw.

I'll say now before I add more pictures that Flaps and I built 25 twins before we ran out of gas doing them and went to seaplanes.
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Old 06-21-2011, 03:30 PM
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Default RE: Sport Twin Pics

Here is my 'TWIN STIK', swapped the Iron Crosses typically found on Stiks for some Canadian Maple Leafs; I run 2 Magnum 40's; changed the cheap and flimsy Aluminum gear out for a set of Dubro Super Strength Landing Gear; this plane is probably my best flying airplane, no bad habits, not even with one engine out, although you have to hold rudder to offset thrust, a lot of fun to fly it.
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Old 06-21-2011, 03:31 PM
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Ed_Moorman
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Default RE: Sport Twin Pics

My next twin was the T-Raider, short for Twin Skyraider, since the plane was made from 2 World Models Sky Raider Mach II ARFs. One wing was used and it had a 14" center section with a 1/4" ply dihedral brace added in the middle. Stock dihedral was used in the outer sections. The wing saddles needed to be modified since one side of the wing had dihedral and the other didn't. The stabs are joined in the middle with a brass strip and a plastic landing gear strap. You unbolt the wing and unscrew the stabs and each fuselage comes off individually.

It uses 8 servos, 2 for each control. Two OS .46AX engines, 11-5 props. This was my best flying twin. It was a pound lighter than the Outsider and would easily climb vertically. Good maneuvers. Flap spins nicely. Would go over the top in knife edge, but couldn't complete the complete knife edge loop.

I finally broke a wing spar and wiped the plane out on concrete. Mach II's are light and only have 1/4" sq. balsa spars. My mistake for not reinforcing or flying it too hard for 3 years.
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Old 06-22-2011, 03:12 AM
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Lifer
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Default RE: Sport Twin Pics

Here's my sport twin. 2 Pro 36 with mousse-can mufflers. About 5 years old.
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Old 06-22-2011, 11:23 AM
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jim19
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Default RE: Sport Twin Pics

Twin Skooter
This was my first twin. I combined two FliteLine Skooter II's using the proportions of the P-51 to the F-82. This model flew very well, even with one engine out. Powered by two HP .40 Gold Cup engine with Rhom retracts. Picture was taken at a Modell Flugtag in Daun, Germany in 1988.
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Old 06-22-2011, 11:56 AM
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Default RE: Sport Twin Pics

I opened this thread in hope of seeing pics of Mark Rittinger's Sportwin or Super Sportwin electric.

Oh well... I might as well post the one photo of Mark's Super Sportwin that I have saved on my hard disc.

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Old 06-23-2011, 09:04 AM
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Murphey
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Default RE: Sport Twin Pics


Mark Rittinger's Super Sportwin Electric is my next project. Bought the wing from Bob Hunt and the plans from AMA plan service! Probably won't start on it until fall...I have a project on the bench nearing completion and can't do 2 projects simultaniously...
M
Old 06-23-2011, 02:45 PM
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Default RE: Sport Twin Pics

Lifer,

Looks like a couple of profile Not-For-Sales. Nice job. I think the twin fuselage planes fly the best, from my experience.

jim19,

I learned to fly RC on a Scooter II back in 1970-71 with an old Enya .45 twin ring engine. I was flying F-111s at Carswell AFB and had 20+ years in CL before buying a radio. The Scooter II was a great plane. It took a beating from me, but I kept fixing it and flying it. I am sure the twin flies great.

Old 06-23-2011, 05:38 PM
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Ed_Moorman
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Default RE: Sport Twin Pics

This is a TwinStar I had. Good flying plane. Pretty tame. Had the worst covering I have ever seen. First the trim peeled off then the nacelles and the wings. I used 2 GMS .32s. Each ran good on a single engine plane, but had the habit of quitting on a twin. A buddy had the same plane and same engines with the same problem. They did run more reliably with a 10-6 prop to keep the rpms down.
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Old 06-23-2011, 05:45 PM
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Default RE: Sport Twin Pics

After flying the TwinStar for a while I changed out the engines, added floats and called it the SeaStar. Thunder Tiger .42GPs ran much more reliably. I also recovered the wings and added wider ailerons. It then had some roll rate. The floats are balsa sheeted foam Prentice floats from a guy up in Canada who has since retired. They are good handling floats and I have them on a Stinger 40 at present.
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Old 06-23-2011, 05:58 PM
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jim19
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Default RE: Sport Twin Pics

Ed,
Flew the Skooter II for many years and went thru a number of them. They were great flying airplanes and I still have a few of them. The twin Skooter was a good handling airplane. Still have it, but it would take some work to get it back flyable.
Old 06-24-2011, 02:02 AM
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Default RE: Sport Twin Pics

Ed,

Essentially correct, but with a learning curve. A couple of prototypes to get the moments correct. The prototypes are still flying as well!
Old 06-24-2011, 12:09 PM
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Default RE: Sport Twin Pics

Here are my two. I have a Twinstar with a pair of OS LA40s. It flys with floats now and then. The other is a Sportster 40 kit converted to a twin using RCM plans. It has a pair of OS 55s. It is a rocket!
Jim
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Old 06-24-2011, 01:06 PM
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edp
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Default RE: Sport Twin Pics

Here is my Cox/Pica Duelist. Twin GMS .47, Futaba 9C and Robart retracts and struts. It's fast and tracks like an arrow
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Old 06-25-2011, 09:31 AM
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Default RE: Sport Twin Pics

aa1a,

Sharp Sportster conversion. With 2 OS .55AXs, it must be a bullet. Did you add some to the wing in the center?

Here's my Twin Stick. 2 OS .46AX engines, 11-5 props. I did use 8 degrees of out thrust. It turned out to be a pound lighter than my converted Tiger 2. This one would do acro on one engine with no worry about the rudder. Great flying plane. I did move all the servos to the rear because it was nose heavy.
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Old 06-25-2011, 09:40 PM
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Default RE: Sport Twin Pics

Hi Ed,
The Sportster has 1 rib added to the outboard edge of each wing, about 3" per side. The sheeting in the center is extended out 1 rib to allow room to attach the nacelles. The center is fiber glassed from nacelle to nacelle. It fly’s great, even single engine. You can take off in about 4 feet, pull to vertical and accelerate straight up.
Jim
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Old 06-26-2011, 09:41 AM
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Default RE: Sport Twin Pics

Jim,

I love it. That's my kind of plane.

I love the .55, too. I have a couple, but never had them in a twin. Maybe I should.
Old 06-26-2011, 04:48 PM
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Default RE: Sport Twin Pics

This is my twin ryobi spad with a 10 ft wingspan.





adrian.

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