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RE: OS GT33 33cc gasser - 12/20/2011 11:07 AM   
Lifer


 

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Status: offline 		Capt G,

What prop are you using?

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RE: OS GT33 33cc gasser - 12/20/2011 12:17 PM   
PlaneKrazee



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Status: offline 		I wonder if you tried to start it backwards would it run correctly?

What is the ignition timing set at on this engine? Is the pickup location adjustable?


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RE: OS GT33 33cc gasser - 12/20/2011 3:43 PM   
Skaluf



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Status: offline 		Guys, I got a bit of advice from OS today. You can retard the timing just a bit by adjusting the sensor 1mm counter-clockwise (viewed facing the prop hub face). This should improve hand starting. As has already been mentioned, about 1/8 or a little less throttle is also the best throttle position for starting.

O.S. is extremely safety conscience. This is one of the reasons for having the CDI not fire until a certain rpm is seen.

Steve

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RE: OS GT33 33cc gasser - 12/30/2011 2:12 AM   
ameyam


 

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Status: offline 		Hey, any further user opinions? I really need to select between this and the DLE30 next week

Ameyam

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RE: OS GT33 33cc gasser - 12/30/2011 4:30 AM   
gmccluskey


 

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Status: offline 		Has anyone used a Tru-Turn spinner with this engine. The spinner I have uses a spacer to fit the crank diameter (9.5 mm down to 8 mm, I think).

Problem is that the engine's drive hub is hollowed out behind the drive plate. It's possible that the spacer could vibrate backwards into this cavity.

I was thinking of using the locktight for bearings or maybe CA to glue the spacer to the spinner. Any thoughts? Another thought was using a spacer tube behind the drive plate, same as the one needed for the wood props (10 mm OD, 8 mm ID). I found an old stab tube (from a H9 27% Extra 260) that works well for a prop hole sleeve.

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RE: OS GT33 33cc gasser - 12/30/2011 5:38 AM   
Capt G



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Status: offline 		My beaver has a tru-turn spinner. I indeed used loctite to glue the supplied spacer into the spinner backplate. Works fine.

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RE: OS GT33 33cc gasser - 12/30/2011 11:29 AM   
skillet92


 

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Status: offline 		You can't go wrong with a DLE, I have 3 30's and each is a great engine, but I will be trying one of these in a Sbach.  But to tell you how much I trush the DLE i have one in a ESM Mustang.  They do not float with dead sticks and need reliable engines.  Planes weights 15+ pounds and the DLE pulls it easy!
quote:

ORIGINAL: ameyam

Hey, any further user opinions? I really need to select between this and the DLE30 next week

Ameyam




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RE: OS GT33 33cc gasser - 12/30/2011 11:44 AM  1 votes
Lifer


 

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Status: offline 		Plus 1 on the DLE. Over the last 5 years I have been converting to gas and have tried several engines. By process of elimination, DLE is the only brand I will buy from this point, forward.

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RE: OS GT33 33cc gasser - 1/1/2012 2:02 AM   
telejojo


 

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Status: offline 		I just ordered an OS 33 to go in my ESM 109 if it's like all the other OS engines I've had it will be just fine.

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RE: OS GT33 33cc gasser - 1/4/2012 7:05 PM   
ameyam


 

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Status: offline 		So, a final word would be that the OS33 is as good or better than the DLE30? I need to decide NOW if I am to purchase it in Singapore next week

Ameyam

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RE: OS GT33 33cc gasser - 1/5/2012 7:49 PM   
MTK



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quote:

ORIGINAL: swk550

I recently ran my OS GT33 for the first time. I am using a home made isolator mount. It can idle around 1800 RPM but my mount shakes too much. I get a good reliable idle at 2300 RPM. I tested two props on the standard muffler. I got 7800 RPM with my 17-12 pattern prop. I am getting 7200 RPM with a Xoar 18-10 swoard. I too had to start at 1/4 throttle to keep it from running backwards. The engine is very easy to start. Attached are some photos of my set-up.

Finally got my engine back from Hobbyservices. It has been installed.....Three flips and she was running once again. The needle settings were way off; I guess I expected Hobbysrevices to have left them alone after running the engine. They said it ran fine, but honestly, at those needle settings there is no way the engine ever came to speed.

Anyway, the sucker runs again so tuning is no big deal


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RE: OS GT33 33cc gasser - 1/5/2012 7:52 PM   
MTK



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quote:

ORIGINAL: ameyam

So, a final word would be that the OS33 is as good or better than the DLE30? I need to decide NOW if I am to purchase it in Singapore next week

Ameyam

Power is much better with OS. Reliability is much better with DLE but that's only my experience. Others experience has been better in terms of reliable runs


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RE: OS GT33 33cc gasser - 1/5/2012 8:02 PM   
PlaneKrazee



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Status: offline 		Matt, You are at a slightly different elevation, running a different prop and tuned pipe. Your needle settings will be different than running the stock muffler. If for some reason your tuned pipe setup isn't timed right it will be stuffing exhaust back in and will run lean and over heat. Could be header length, convergent cone location, stinger length etc. Different engine exhaust port timing requires different pipe timing as does going from glow to gas. Heat and flame spread also effect tuned systems.

Too bad you don't run it with the factory tested exhaust to simply see how it acts, could be it doesn't like your setup. I had the OS 160FX on a Jett incowl turbo muffler. Gained 1000 rpm on a Bolly 18X10 carbon but never landed with the engine running. Tried richening the high, the richening the low, leaning the low and all possible combinations. Ran great on the ground but would either blow the plug (lean) or just quit in the air. The engine had baffles all around it and 1 to 4 air in to out. Ran perfect on both a Jtec Dual snuffler and a Bisson ST4500 pitts.

Of course if it runs fine now that it's back, Hobby Services fixed something but the world may never know. If it tunes like the 160fx it will never run correctly if the low needle is lean.

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RE: OS GT33 33cc gasser - 1/5/2012 9:13 PM   
captinjohn


 

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quote:

ORIGINAL: ameyam

So, a final word would be that the OS33 is as good or better than the DLE30? I need to decide NOW if I am to purchase it in Singapore next week

Ameyam

A real good thing to remember is the DLE 30cc engine is easy to find parts for and very low priced.  Price the parts for a OS engine and a DLE engine.  I bet you will get the DLE       Capt,n

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RE: OS GT33 33cc gasser - 1/5/2012 9:34 PM   
mpascual


 

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quote:

ORIGINAL: captinjohn


quote:

ORIGINAL: ameyam

So, a final word would be that the OS33 is as good or better than the DLE30? I need to decide NOW if I am to purchase it in Singapore next week

Ameyam

A real good thing to remember is the DLE 30cc engine is easy to find parts for and very low priced.  Price the parts for a OS engine and a DLE engine.  I bet you will get the DLE       Capt,n


+1

Compare ignition module price only.
On the GT 55, the price of ignition is 279 USD (add 49USD for the sensor)
Best regards

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RE: OS GT33 33cc gasser - 1/5/2012 9:49 PM   
PlaneKrazee



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quote:

ORIGINAL: mpascual


quote:

ORIGINAL: captinjohn


quote:

ORIGINAL: ameyam

So, a final word would be that the OS33 is as good or better than the DLE30? I need to decide NOW if I am to purchase it in Singapore next week

Ameyam

A real good thing to remember is the DLE 30cc engine is easy to find parts for and very low priced.  Price the parts for a OS engine and a DLE engine.  I bet you will get the DLE       Capt,n


+1

Compare ignition module price only.
On the GT 55, the price of ignition is 279 USD (add 49USD for the sensor)
Best regards



Very good point! Tower/OS needs to rethink the parts pricing....but they won't.

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RE: OS GT33 33cc gasser - 1/5/2012 10:50 PM   
wyo69cowboy



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Status: offline 		That's a good point. Lots like to point out OS reliability/durability, which hasn't been entirely proven on this 33, but if you wreck a plane and break nothing more than an ignition box, it'd cost you almost a new DLE to put it back into service....ouch! I wrecked my DLE55/Reactor combo 2 years ago (due to my stupidity), and the ignition box looked ruined. Sent it back to Valley View (where I bought it) and they fixed it up quickly and for relatively little, stating the ignition worked fine. It finally failed a year later (developed a miss then quit), but I can't blame that on the ignition. A new cylinder, cases, and bearings for the DLE55 cost me less in repair than the OS ignition...

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RE: OS GT33 33cc gasser - 1/6/2012 12:50 AM   
MTK



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quote:

ORIGINAL: mpascual


Compare ignition module price only.
On the GT 55, the price of ignition is 279 USD (add 49USD for the sensor)
Best regards


I am no fan of the OS by any means. However the ignition module and sensor one may use could be the standard fare for RCexl. OS has some silly custom software in their module that prevents ignition unless the prop is turning higher than the equivalent of 100 rpm...ie- a fairly quick hand flip.

The recently returned 33GT is being run with a standard RCexl CDI. This costs around 55$


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RE: OS GT33 33cc gasser - 1/6/2012 12:58 AM   
ghoffman


 

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Status: offline 		So, Matt,what happened with Hobby "Services"?



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RE: OS GT33 33cc gasser - 1/6/2012 1:08 AM   
PlaneKrazee



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quote:

ORIGINAL: MTK

The recently returned 33GT is being run with a standard RCexl CDI. This costs around 55$


Did you check and set the timing @ 28 degrees BTC for the RCEXL module?

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RE: OS GT33 33cc gasser - 1/6/2012 5:01 PM   
MTK



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quote:

ORIGINAL: ghoffman

So, Matt,what happened with Hobby ''Services''?



Gary,

Nothing else. They simply returned the engine after 5 1/2 weeks, replacing the backplate (with the mounting lugs). They told be in a phone conversation that the backplate was broken which supports the extremely lean running I experienced at the very end. They did not return the part for my inspection. But they also said that they ran the engine when they first received it with the broken backplate and that it ran fine....I don't believe that

I just hope the backplate was simply a bad casting and not a design flaw. My application uses a soft mount so the backplate load is far lower than in a hard mounted set-up. Nevertheless, somehow the backplate was broken in what they claimed was shipping damage. I tend to believe that if there indeed was a broken backplate, my set-up experienced it first because the one time we did start the engine with a starter, it ran extremely lean with no power. So the alleged damage may have happened during the second flight I took with the engine

I don't know really, it kinda smells a bit fishy.......however I can't argue with the good result so far. The engine runs well, on pipe, same as the first couple runs I had on it. Spools the 18x12 at very nice output, far better than any other engine in this class I have played with (SAP30, Mintor 38 and ZDZ40). I also have run a 20x10 on this engine and it turns that size prop fine but again, it's piped.


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RE: OS GT33 33cc gasser - 1/6/2012 5:04 PM   
MTK



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quote:

ORIGINAL: PlaneKrazee


Did you check and set the timing @ 28 degrees BTC for the RCEXL module?

Yes...32 degrees. I moved it back 5 degrees. It hand started easily enough at 32 degrees but it was better, easier at 27 degrees with either the RCExl or stock OS CDI


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RE: OS GT33 33cc gasser - 1/6/2012 5:26 PM   
PlaneKrazee



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Status: offline 		Glad to hear you checked and set it. It should behave much better @ 27-28 degrees.

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RE: OS GT33 33cc gasser - 1/6/2012 6:38 PM   
ameyam


 

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quote:

ORIGINAL: PlaneKrazee

Very good point! Tower/OS needs to rethink the parts pricing....but they won't.



Well, as of now, Singapore Hobbies informs me that they dont have a DLE30 in stock. I go there mid next week and will go to their shop only on Friday or Saturday. Hopefully, they have the DLE30 then so that it makes my decision easier

I checked with Rotor, they dont have either engine.

Any other place in Singapore I can look for these?

Ameyam

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RE: OS GT33 33cc gasser - 1/7/2012 1:12 AM   
jnred123


 

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Status: offline 		Matt
What pipe are you using and what header length.
What is it turning the APC 18x12 at.
Cheers
Greg Hede
Australia

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