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CanoMod . Futaba-RC . A Main Hobbies

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JR Heli Vibe - Airskipper - Sylphide - Venture > TT 39 in Venture 30
 
 
helicrash333
Heliman
Location: Vestal NY

OS46 or TT39

I am wondering about putting a new engine in my Venture this winter. I know some time ago people were posting about putting the OS46 and even the OS50 in with just a new engine mount. With all the rave reviews on the new TT39 I am thinking hard about this motor. Does anyone have any thoughts on the OS46 compared to the TT39 in terms of power, and does the 46 run in it's intended power band with stock gearing in the Venture.

thanks for any input

Joe
10-11-2002 Over year old.
 
 
ToyTech
Heliman
Location: Tacoma WA.

How good is the muffler that comes with? Just in case my pipe does not work out.
10-11-2002 Over year old.
 
 
bigwave
Senior Heliman
Location: Central Illinois ( Farm Country ) , USA

Toytech

My Venture flies extemely well and flies very consistantly but, I like you have thrown the pitch guage back on the bench. Just for the heck of it I put the guage on it last night and it shows +13, 2, -8 in idel up, in regular mode I show +13, 4, -5. I only use regular mode to land and take off, on 12 min of fuel I probably fly less than one minute in regular mode.
Back to the pitch guage issue. I've been practicing / learning inverted hover / inverted-flight and where it's at now (-8 by the guage) it climbes out very well inverted and flies around very well inverted. It hovers at about 55% stick normal and 70% inverted hover, which the engine sounds very comfertable with and feels good on the stick, for me anyway.

As for the difference between the OS 46 and TT 39 I would say the OS 46 puts out a little more power compared to the TT39 but, the TT 39 puts out allot more power compared to the OS 32.
Before I put the TT39 on my Venture to hold an inverted hover took about 85% stick and it climbed out pretty slowly not to mention I would loose allot of head speed. With the TT39 it just shoots right up inverted and the engine don't seem to loose any RPM.

As for the latest update on the TT39, I'm still running around 2/3 turns rich and it still has a ton of power, it's running at a very rich 2strk. The engine temp is showing 160' - 190' and the oil being spit out of the exhaust is very clean, no signs of aluminum or dark coloring. I'm still running WildCat 15%-nitro, 18%-oil heli fuel and will continue to do so indefinately.

The OS engines are out standing engins, but in this case if your wanting a nice increase in power, with out having to spend much cash, and a true drop-in replacement (nearly no mods needed) this is a nice way to go.
10-11-2002 Over year old.
 
 
ToyTech
Heliman
Location: Tacoma WA.

Bigwave, what muffler/pipe are you running on yours?
10-12-2002 Over year old.
 
 
bigwave
Senior Heliman
Location: Central Illinois ( Farm Country ) , USA

Mavrikk ( I think )

I'm running the stock muffler that came with the heli in the package deal from Heliproz. I bought this heli from Heliproz in a package that included Heli, OS32 Engine, & Muffler. But I think its just a low dollar Mavrikk muffler. But, it's working fine, hasn't come loose and seems to seal pretty well around the engine.
10-12-2002 Over year old.
 
 
ToyTech
Heliman
Location: Tacoma WA.

Hey Dazzler/bigwave.....I went one step further today. I found that the 46FX airplane motor and the 46FX heli motor are the same shape and have the same crank, of course the carb and heatsink for the head is different. Anyway since I have 2 of these airplane 46's laying around, I decided if I'm going to remove the 32 I might as well really make it a major upgrade. I picked up a stock 46 muffler and found a Hirobo mount that slides into the frame perfect. I had to enlarge the mounting hole a smidge to allow the 46 to fit (vertical) properly, but for the most part it was a direct install. Useing this motor is only temp till I can save up the funds for a 46 heli engine, but for the time being this would allow me to set it up and try the combo out. Part of what I feared is true, the plane engine is all or nothing concerning the throttle range, so I will need to replace it with a 46heli and maybe a different pinion gear, motor first and gear if needed second. The "POWER" when I stab the collective is phenomenal, the bird would go for ever if I gave it the chance.
10-13-2002 Over year old.
 
 
Dazzler
Elite Veteran
Location: Ohio

Toytech, sounds interesting, did you set the throttle curve to adjust for overspeeding, I'm sure you have alot of power with that combo. Daz...
10-13-2002 Over year old.
HOMEPAGE  
 
 
ToyTech
Heliman
Location: Tacoma WA.

I've got the throttle curve set toward the upper end to help the mid stick hover and the throttle cure to balance the rpm. This was in the back yard I was trying to trim it out before any forward flight. When I stab the collective, the engine has lots of power and it sounds good, no over rev, but a basic hover is hard to perform, the engine does not like the mid stick. I think this is just a drawback of a airplane non ringed engine in a heli. I will deff. buy the heli version when I can afford it, after that I might need to address the pinion. It has the stock 9 tooth pinion, I might need to go 1 or 2 smaller to load the engine more. Firt however is an engine. In the end I think the bird will scream with endless power...
10-13-2002 Over year old.
 
 
heliman21
Heliman
Location: Phoenix, AZ

I installed my TT39 last week and this morning gave it the test. I ran 4 tanks through at @ 3.5 turns open on the needle. The fuel used is Cool Power 30%. The muffler is a TT 30 size. The TT performed great and didnt miss a beat. The transitiion was right on, I didn't change the low end at all. I was suffering the same problems as most here. The Venture is just seemed too heavy for the OS 32. I'm running -4 to +10 on the normal curve, Idl1 -10 to +10 at 3/4 hover. Finally I can fly around with some authority. I'm still concerned of the TT engine due to the track record of TT as a whole. I think keeping it slightly richer than normal and adjusting the curves will ease the worries. With just the engine as an upgrade, using the old muffler and mount, this was an easy upgrade. I added the second washer under the drive washer and elongated the slots in the frame to drop the engine down to keep the clutch from rubbing on the top of the clutch drum. Tomorrow , more fuel and flying! For a change!
10-13-2002 Over year old.
 
 
Dazzler
Elite Veteran
Location: Ohio

I'm running Wildcat 20% in mine, and yesterday got about 6 flights on it, and I have adjusted the high end needle to about a little under 3 turns open, and its running great in the Venture. I had to adjust my low end leaner to get the transition a little better. Daz...
10-13-2002 Over year old.
HOMEPAGE  
 
 
bigwave
Senior Heliman
Location: Central Illinois ( Farm Country ) , USA

Minor mishap

I just got mine back in the air yesterday. I was landing Nose-in a few days back and right at touch down a major gust of wind hit and I didn't manage to correct enough and she fell over. Probably still had 600+ rpms on the blades, it cracked one of my blades, bent the spindle, and of course broke both see-saw arms. I had all the parts at home, but now it's all out of trim, tracking etc. So now I have a few flights of adjustment work to do to get it back to even-keel.

Daz,
How much fuel do you have through your TT39?
I assume your running it at a mid 2 stroke level or are you still richer than that?

Toytech,
The engine conversion sounds good; I don't know why that wouldn't work. Watch your engine heat, with the smaller head the engine will have a little harder time dissipating it. Another thought is 580mm blades, if you could find some. I bet they'd work great with your setup.

Happy landings everyone
10-13-2002 Over year old.
 
 
Dazzler
Elite Veteran
Location: Ohio

Bigwave, I have about 2/3 gallon through it now. I am 2 cyclying now, I just got home from the field, and it was windy as Hell, but the TT39 handled upwind fine. My temp reading is getting up to about 190 degrees now, yesterday I leaned it out a little more, and went up to about 216 degrees, but I richened it back up after that flight, its running great, it flew great when I got up to 216 too, just didnt want to go up too fast until I get a gallon through her. I leaned out the low end just a tad more today to get an even better transition, the low end is perfect now.

BTW, my 1st TT39 gave me nothing but problems, when I got it back from helihut, it ran like crap, so I disassmbled it, and found the piston/sleeve were totally scratched up, so I sent it back to Ace Hobby, and helihut gave me a good deal on another one, so this is my 2nd one, and have have about 15 flights on this one. I believe the 1st had some metal chips inside, and I never checked it for that b4 running. On my 2nd one I disassembled it and found a metal chip inside, so for now on I will be checking for this whenever I buy a new engine. Hopefully Ace will replace, or repair the old one, if they dont I'll just wait until a piston/sleeve is avalable and repair it myself. Daz...

Sorry to hear about your mishap, good you had the parts though!!!
10-13-2002 Over year old.
HOMEPAGE  
 
 
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JR Heli Vibe - Airskipper - Sylphide - Venture > TT 39 in Venture 30
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