cwasik

My Feedback: (1)

I purchased a Hangar Twin Otter last year and I am finally at the stage of selecting power. I thought about getting the OS 35 AX's but the price is steep. I know that will probably be my best bet but they are a little steep in price for me. I have two 46 FX's that I was thinking about but I am not sure if they will be to heavy for the model. Does anyone have any suggestions? Any advice would be greatly appreciated.

slopoke

My Feedback: (16)

I have Saito .40's in mine. It flys very well and sounds great.

cwasik

My Feedback: (1)

I wonder if two Saito 56's would work well or if weight would be a big issue. I already have one 56 so this would be a good alternative to the O.S. 35's if I can make it work.

Lifer

My Feedback: (1)

Thunder Tiger Pro .36's might be an affordable option. I have had good luck with these engines.

cwasik

My Feedback: (1)

I use two of the TT 40's for Pylon Racing and they both run really well. They seem very reliable and they are quite a bit chreaper than the O.S. 35's. Great suggestion.

bigstew60

My Feedback: (35)

I am putting os 70 4 strokes on mine.

speedbrake

Used two Saito 40 four strokes. Flies great.
Keith

bigstew60

My Feedback: (35)

I ran into a snag with my twin otter. The os 70 four strokes wont fit without me cutting into the firewall to recess the engine back. I am trying to decide if i should do it or find some smaller 4 strokes.

kthmarks

I'm in the process of doing a makeover to the H9 Twotter. I am making a DHC6-100 instead of the -300. I did quite a bit of research on engines so hopefully you can benefit. Since I am recovering/glassing/painting, I was not confident the Saitos 40's would perform with the increased weight. The FA-40 appears to be the only 4 stroke engine that will fit without modification.

Below is what I found. I elected to go with the Saito FA62A's since they are in the same case as the FA56, and I already own one of the required 2. I also extend the cowl instead of cutting into the firewall as I also increased tank size from the standard 8oz tank to 10oz. The line of the prop still appears to be in line with the fuse in a scale location. I'll post pics when I get some.

Disclaimer.... the dims for the Magnum below is the best I could determine. Info for that engine is hard to find.



Below is my target model

Chuck54sd

Just installed 2 OS Max .46 AX's in mine.... have not flown it yet. Balance came out great (no weights needed). It's a tight fit.... but came out great. I kept the regular mufflers on it. Just tweaking out the controls right now. Used the mix function in my Futaba 8FG for the elevators (you will need to reverse one side & mix gear with elevator or buy a servo reversor). This will be my test bed for the Twin sync since the cowls are easy to get to. The reason I selected the OS 46's..... is I have had a history of solid performance with them.... a very stable and dependable engine.... with great power for this size bird. For a twin..... stable is good. The OS Max 55AX.... not so much. (great power for size.... but finicky).

fledermaus

The Evolution 36s that H9 "recommends" work just fine in my Twotter. They fit nicely, and the price is excellent. Plane flies in a very scale fashion using the 11x6 prop that H9 recommends (slightly "over propped" for the engine but it works much better than the 10x6 you might otherwise use).

Thomas B

My Feedback: (4)

I went with E-Flite Power 32s, 4s4000 lipos and 60 amp Detrum ESCs for my Twotter.... Total power system cost including batteries was $270. (motors were $70, ESCs were $20 and the lipo was $45, per side.

Hard to beat electric power for the H9 Twin Otter....no cylinder head or muffler cutouts, improved reliability and they give a very nice simulation of scale turbine power!

I got mine together over the Christmas break and maidened it on 12/30/11. A really great flying model!

SIMCO

My Feedback: (33)

Love the last picture on final. Looks like Woody is dressed for the Artic!!!

jetpassion

My Feedback: (29)

About how many minutes you can fly with this setting ?

kthmarks

Hey guys......below is a link to my second outing with the Otter. GREAT flying plane. Could not be happier.


http://youtu.be/kdffK5v5fJM

korvette

Hey Keith,

You have saito .62 engines on board....do the fit in?...and the exhaust ? Please, a few close up foto's. :-)
Or did you have to rebuild the plane?


Kor

kthmarks

Below are a few photos.

I had to rework the nacelles to get the 62's to fit. I extended the cowls appx 1/2" by adding blocks to the existing firewall and then filled in recessed space that the nacelles originally mounted to with 1/32 ply and filler. In addition, I removed the tank floor of each nacelle and made a new one appx 3/4" lower to achieve the correct center-line relationship of the tank to the carb. I used a combination of maple, basswood and light 1/4" plywood to reinforce the construction after cutting out the floor.

I bumped the tanks from 8oz to 10oz and I'm glad I did. My last flight was 8.5 minutes and I used appx 5oz of fuel. With regard to the exhaust, I used a 90 degree adapter (tapped for pressure) with a straight pipe out the bottom of the nacelle. Unfortunately it doesn't sound like a turbine.....more like a hot rod!

korvette

Hi Keith,

Great looking plane...and those army colors are awsome....
Mabay are a couple of turbo header mufflers the solution for your sound problem ? (http://www.rcspecialties.net/ )

What do you think...are those muffles fit insite the cowls ?

Greatings,

Kor

kthmarks

Those mufflers may be a good solution. I'll look into it. After so much building over the winter, I think I'm going to enjoy this bird a little before I make any changes.

With regard to the finish, it is actually modeled after the Norwegian Special Forces aircraft used from 1967-2001! The plane later got around some and unfortunately met it's demise not far from where I live here in Georgia, US. I found that out after I was well into the project. Good thing I am not superstitious.
http://www.719skvadron.no/dhc6/dhc6-news.htm


If you're thinking about going with 4 stroke glow, I'd seriously look at the OS FS56 or better yet, the YS FZ70-S. Both have a smaller footprint than the Saitos and deliver more power. The YS has a crazy amount of HP. I went with the Saitos because I already had one of the required two and did not want to incur the added cost.

Keith

korvette

I have those saito's already in my possession :-)....one is in use already...the other one is new.
The intention was that they come in the Marutaka Cessna 337 Skymaster.... but I have to finish this plane...and thats gonna take a while.
Thats why I am looking for a RTF twin plane where I can use those engines...and this twin Otter looks great.

I think I am gonna order one.....I see in your pics that the engine fits with some modifications....the mufflers....whell...perhaps the original saito's or also those turbo mufflers...if they are not too noisy.

Kor

kthmarks

See attached for the modifications I did to accommodate the Saito 62's. Your experience may vary.

jbettinelli

My Feedback: (1)

Hello all, I took my otter to the feild yesterday and had trouble synching the engines. One was running faster than the otther, I dicsonneceted the throttel servo pushrod to get it to run in sequnce with the other engine, but I still couldnt get them close enough. When I taxied the runway, I had to keep constant rudder to track straight.

I am considerign buying a servo synchronizer, I dont have anotehr channel on my radio to program.

So, couple questions, how close in RPM's do you get, or do you do it by ear, and do you think the synchronizer is a solid solution?

This is my first twin, so trying to learn as |I go along.

have a great day, thanks,

Joe

JPMacG

My Feedback: (2)

My experience (with 2-stroke twins) is that you should adjust the linkages so that the throttles track mechanically as closely as possible. When you get to the field you run each engine independently and tune the high and low needles the normal way. And then fly.

No attempt should be made to adjust the needles so that the engines run at the same rpm. That is a recipe for having an engine quit in flight, which can be ugly. And by the way, for someone new to twins, I recommend that if you lose an engine in flight you immediately throttle down the other engine and perform a dead stick landing like on a single engine model.

You may need to run your newer Saito more before marrying it with the older Saito. Maybe for several gallons of fuel so that it is fully broken in.

JPMacG

My Feedback: (2)

I'll add another comment... I find that I do need to sometimes use a lot of rudder on takeoff. I think it is because one engine is not coming up to power as quickly as the other. But having to use a lot of rudder is also a clue that one engine may be having a problem.

kthmarks

I went with a Twin-sync setup on mine. LOVE IT and the installation was pretty straight forward. The biggest issue is getting the servo end points set up correctly so you get maximum sensitivity from the unit. I elected to put the sensor magnets in the spinner hubs. I am quite pleased with the operation and the engines are within 100-200 rpm of each other. One other HUGE advantage is that if you have an engine out, the active engine immediately goes to idle. Already saved my bacon on a touch and go.

http://www.troybuiltmodels.com/items/WRCTWINSYNC.html