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-   -   twin (http://www.rcuniverse.com/forum/twin-multi-engine-rc-aircraft-192/9793924-twin.html)

michael wood 06-10-2010 09:41 AM

what would be a good twin for a pair of magnum 52 4-strokes michael

Ed_Moorman 06-10-2010 06:01 PM

RE: twin
1 Attachment(s)
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.

michael wood 06-10-2010 10:52 PM

RE: twin
thanks ed iam waiting on a hobbico twinstar i think it would be a good match should be here next week it says up to a 40 so the 52s should fit michael

CanDo 06-11-2010 09:27 AM

RE: twin
You can get a lot of advice about twins, but you will never get better advice than Ed's.

JPMacG 06-11-2010 11:45 AM

RE: twin
The Twinstar is very nice. I just finished one. Fitting the 52s in the engine compartments may be a challange, but you can work it out.

michael wood 06-11-2010 03:05 PM

RE: twin
JPMacG have you flown it yet if so how was it with the 52 4-strokes and if any mods michael

telejojo 06-11-2010 08:17 PM

RE: twin
I've got a pair on my H-9 B-25..............works very good

JPMacG 06-11-2010 11:07 PM

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.

Ed_Moorman 06-12-2010 04:44 PM

RE: twin
1 Attachment(s)
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.

michael wood 06-13-2010 09:58 AM

RE: twin
It will be here this week and thats the first thing iam going to check hopefully i wont have to buy new engines michael

JPMacG 06-14-2010 06:54 PM

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.

michael wood 06-24-2010 10:46 AM

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

Iron Dog 06-25-2010 03:34 AM

RE: twin


ORIGINAL: michael wood

just got my magnums 25s mounted and test run ran two tanks thru them
Did you switch engines to 25 2-strokes, or just reverse the digits?

(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.)

michael wood 06-25-2010 06:15 AM

RE: twin
its not reversed i bought two magunm 25s michael

JPMacG 06-25-2010 11:13 AM

RE: twin
I think you will find that the 25s are plenty of power. The flight time with the 25s will be decent. Really no need for anything larger.

michael wood 06-25-2010 04:20 PM

RE: twin
we will see saturday hopefully i will have the engines some what broken in by then michael

motoman326 10-16-2012 04:22 PM

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.



Yury 10-17-2012 08:10 AM

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.

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