twin
#2
My Feedback: (1)
RE: twin
Anything in the .40 size class. A buddy and I (he just builds now at 87) have used ours on several airplanes. We have found the Maggie 52s to be very reliable on a twin. Here are a few pictures of planes with our 2 Mag .52s.
My recommendations for twins after 25 of them
-Tune each engine individually and don't worry about syncing
-Set each one slightly rich. Never lean out to the peak-one will surely quit.
-Don't let your buddies tweak your engines.
-If the plane makes a goofy move, throttle immediately to idle, then come back in slowly with the power and rudder. You have probably lost an engine.
-Don't let your buddies mess with your engines.
My recommendations for twins after 25 of them
-Tune each engine individually and don't worry about syncing
-Set each one slightly rich. Never lean out to the peak-one will surely quit.
-Don't let your buddies tweak your engines.
-If the plane makes a goofy move, throttle immediately to idle, then come back in slowly with the power and rudder. You have probably lost an engine.
-Don't let your buddies mess with your engines.
#8
My Feedback: (2)
RE: twin
I just did the maiden flight today on my Twinstar with two Thunder Tiger GP-28 2-strokes. Very, very nice sound!!!!! It flew nicely - well behaved, handles easily, no bad habits. Rolls, loops, and inverted flight are no problem. It lands a little on the fast side. The flight characteristics are good but nothing special. It is exactly what Hobbico says - a twin trainer.
On the third flight I lost an engine shortly after takeoff. I went to full throttle and tried to fly on one engine and correct with rudder but I was low and slow and didn't have good control. So I throttled back and landed off field in some tall grass. No damage.
The GP-28s are plenty of power. Flight time is OK - I'd say 10 minutes with some reserve. I can see that flying a twin will be a learning experience - I will be getting very intimate with these engines.
I expect that mounting four strokes will be tricky. The GP-28s were a snug fit. You may need to cut off the engine compartment cheeks to make room. The throttle linkage may take some creativity.
On the third flight I lost an engine shortly after takeoff. I went to full throttle and tried to fly on one engine and correct with rudder but I was low and slow and didn't have good control. So I throttled back and landed off field in some tall grass. No damage.
The GP-28s are plenty of power. Flight time is OK - I'd say 10 minutes with some reserve. I can see that flying a twin will be a learning experience - I will be getting very intimate with these engines.
I expect that mounting four strokes will be tricky. The GP-28s were a snug fit. You may need to cut off the engine compartment cheeks to make room. The throttle linkage may take some creativity.
#9
My Feedback: (1)
RE: twin
The TwinStar is a good little airplane. I had one and flew it on land and on floats. It's an easy flying twin, very forgiving and easy to control, take off and land.
The TwinStar has, in my opinion, 2 glaring problems: 1. The tanks are only 4 ounces, maybe less. There ain't no way to fit bigger ones short of lengthening the nacelles out front. 2. The trim and then the covering peels off. Iron it down, clear epoxy it down, CA it down, but keep at it. I lost most all my trim and recovered the wings.
I used GMS .32s on land and Thunder Tiger GP .42s on floats.
As I recall, the TwinStar comes with the Great Planes 20-48 sized engine mount. It might spread enough for the .52s. I ended up cutting the cheeks off for water use with the larger engines.
The TwinStar has, in my opinion, 2 glaring problems: 1. The tanks are only 4 ounces, maybe less. There ain't no way to fit bigger ones short of lengthening the nacelles out front. 2. The trim and then the covering peels off. Iron it down, clear epoxy it down, CA it down, but keep at it. I lost most all my trim and recovered the wings.
I used GMS .32s on land and Thunder Tiger GP .42s on floats.
As I recall, the TwinStar comes with the Great Planes 20-48 sized engine mount. It might spread enough for the .52s. I ended up cutting the cheeks off for water use with the larger engines.
#11
My Feedback: (2)
RE: twin
Just a note on the covering and trim...... recently manufactured Twinstars are apparently covered in Monokote. I purchased mine form Tower in January 2010 and I believe it to be Monokote. When the Twinstar arrived the trim was barely holding on. I could lift up an edge with my finger nail and peel the trim off.
I sealed down the trim using Monokote Trim Solvent. I got a small artists paint brush and painted trim solvent along the edges of the trim, overlapping the trim and the base monokote. The solvent wicks into the trim line and creates a very robust bond. I painted it on and just let it sit for 24 hours to dry. Then I wiped up the little bit of color bleed using acetone. After doing this I can pick at the trim with my fingernail as hard as I want and it will not come up. I think the base monokote would tear before the trim came off.
I sealed down the trim using Monokote Trim Solvent. I got a small artists paint brush and painted trim solvent along the edges of the trim, overlapping the trim and the base monokote. The solvent wicks into the trim line and creates a very robust bond. I painted it on and just let it sit for 24 hours to dry. Then I wiped up the little bit of color bleed using acetone. After doing this I can pick at the trim with my fingernail as hard as I want and it will not come up. I think the base monokote would tear before the trim came off.
#12
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Join Date: Jul 2005
Location: linden, TN
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RE: twin
just got my magnums 25s mounted and test run ran two tanks thru them one enging runs fine the other runs like it will rev up and run fine for awhile and then bog down and pick back up again i guess i need more break in tme on them i am running them a little rich and i am also using castro oil mixed in my fuel as all ways (old school) i will get some more run time on the engines and try to fly it saturday michael
#13
RE: twin
ORIGINAL: michael wood
just got my magnums 25s mounted and test run ran two tanks thru them
just got my magnums 25s mounted and test run ran two tanks thru them
(I'm curious to see how you like the 52s if that is what you end up using, because I have a Twinstar and have not decided which engines to use yet. I have onlyoneMagnum 52 and one OS 52, but have four Magnum61s. If you find the Magnum 52 is too much power then the 61s would be, too; and it still wouldn't make sense to buy another Magnum 52or OS 52, either. I also have 2 MDS 40s, but these would offer similar power, as well.)
#17
RE: twin
I have a Twinstar with a pair of OS 25 LA's. I also added E-Flite retracts (lots of extra work but boy does it look cool on those low passes)
Just wanted to touch on what Ed said intially
Don't let your buddies tweak your engines.
Don't let your buddies mess with your engines.
and finally NEVER let your buddies try and lean/richen out your engines.
Here is a video of the maiden.
http://www.youtube.com/watch?v=oN1b-Xrs9MY
Thanks
John
Just wanted to touch on what Ed said intially
Don't let your buddies tweak your engines.
Don't let your buddies mess with your engines.
and finally NEVER let your buddies try and lean/richen out your engines.
Here is a video of the maiden.
http://www.youtube.com/watch?v=oN1b-Xrs9MY
Thanks
John
#18
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Join Date: Nov 2002
Location: Saint Petersburg, RUSSIA
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RE: twin
I think two 52 4-strs engines for 40 size model it's to much. I have Ultra Sport 40 with two 30 size engines. These engines produce adequate power for patern 40 size model. [link]http://vimeo.com/41905651#at=0[/link]
If I were you I look some thing 60-90 size.
If I were you I look some thing 60-90 size.