OS GT33 33cc gasser
 

Any one have photo's or any more information on the new 33cc gasser from OS. Tower's info is real sparse so far. Has it been posted anywhere else and I just missed it?
Fred

RE: OS GT33 33cc gasser
 

RE: OS GT33 33cc gasser
 

Rear carb?

Wasn't expecting that

RE: OS GT33 33cc gasser
 

So all you conspiracy theorists, Which Chinese gasser did they copy ?? Or maybe a DA 50 ? After all, they LOOK like one...NO wait, the cylinder doesn't come off, just like a G38 or Q40/US 41...Side exhaust like most other gassers...
No rail mount, rear carb, a prop stud like a G26..ETC.......;)

RE: OS GT33 33cc gasser
 

Yep, two stroke engine designs are so unique they've been copied over and over for the past 50 years. It's all "new" every time a new engine is released.

RE: OS GT33 33cc gasser
 

I hope its a better engine than my BGX 3500.[&o]

RE: OS GT33 33cc gasser
 

Don't know what will be the price from others than Tower Monopolies but if they sell it under $400 the DLE 30 engine is in danger http://www.rcuniverse.com/forum/js/f...ades_smile.gif

RE: OS GT33 33cc gasser
 

Nice, like the single prop shaft fastener. much more user friendly than having to drill 4 darn holes.
I'd buy it over the DLE 30 for that reason alone!

RE: OS GT33 33cc gasser
 

$419.99

RE: OS GT33 33cc gasser
 

I wonder if any of you have the GT55 version? Are they still having ignition issues or did that get resolved? If not I wonder if the issues will carry over to this engine? Don't mean to hijack your thread.

I really liked the GT-55 and it sounded great (kinda like a dragster) on a wrap around pipe. Anyway was just wondering if the ignition issueis fixed. I have been looking for some threads on that but other than youtube I have not been too succesful finding what if anything OS had done.

Thanks

Glenn Williams

RE: OS GT33 33cc gasser
 

I fixed mine by first running it on a DLE-30 ignition, then after Tower kept saying it was fine, I replaced it with a DA-60 that weighs less, runs perfectly and puts out stupid power.
http://youtu.be/weCuIb5370U

RE: OS GT33 33cc gasser
 

RCEXL ignition system now OEM for OS engine . so later any OS engine will have ignition system that made by RCEXL

RE: OS GT33 33cc gasser
 

That is good news.

RE: OS GT33 33cc gasser
 

Funny, Tower kept saying there was no problem with my OS ignition box! I wish someone besides Tower was the distributor for OS, because with Tower, you basically have no warranty.

RE: OS GT33 33cc gasser
 

I wonder if OS is getting any user feedback.

RE: OS GT33 33cc gasser
 

yawn.... standoffs(should be beam -mount) rear carb (should be front) $419 (should be $319) the single-bolt prop hub is the only thing they got right. OS seems to be designing their engines in a bubble. I've heard-read that a 23cc is coming soon. maybe they'll get that one right.

RE: OS GT33 33cc gasser
 

O.S. designs engines for people that live in a bubble. :D

RE: OS GT33 33cc gasser
 

Here are prop/rpm data.
Silencer: Standard E-5030
Fuel: Regular gasoline Oil KLOTZ 2C 50:1
Props:all APC

18x6W 9,100 RPM

18x10 8,080 RPM

18x12 7,520 RPM

20x8W 6,580 RPM

RE: OS GT33 33cc gasser
 

LOL so true! And think about it this way! If you join the super saver club you can get 50 off the 419 price which puts it that much closer to the dle 30!! I love the OS reliability in their 4strokes! I have a dle 30 and love it, but a reasonable priced OS gasser in the same size! WOW!! So if OS can can translate the quality of there glow engines over I will be buying some of these little gems!! And if a 23cc comes out!!:D :D:D:D:D My wife is NOT going to be happy!:)

RE: OS GT33 33cc gasser
 

That is some twisted logic. :D Your close and my close aren't close.
The $50.00 discount gets the OS 33 within $50.00 the retail price of the DLE30 yes but when you apply the same discount to the DLE 30 they aren't "close" anymore.
OS 33 $419.97 - $50.00 = $369.97
DLE30 $319.98 - $50.00 = $269.98
If the replacement parts for the 33 are priced anything like their 55 they will be astronomical.
You can tell your wife you saved $100.00.

RE: OS GT33 33cc gasser
 

OS 33
Price ""$419""

Prop ""20x8W 6,580 RPM""
-



now let's compare that to only 2 more cc, my MVVS 35 that I bought some 4 years ago,,

Price,, $30 more ($449) less muffler

Prop,, 3W 20x8 7370 peaked, Zinger 20x8 peaked over 7600

now the OS may be lighter and most likely is, but with those Prop numbers I don't think it will fly side by side the MVVS 35 or the Roto 35

RE: OS GT33 33cc gasser
 

Take a Look at the weight ,MVVS is very good engine but the weight difference is around 480 gram only on engine , also same weight difference with Roto.

RE: OS GT33 33cc gasser
 

like I said,,

now the OS may be lighter and most likely is, but with those Prop numbers I don't think it will fly side by side the MVVS 35 or the Roto 35

RE: OS GT33 33cc gasser
 

Who here would buy the OS33 over a Syssa?

RE: OS GT33 33cc gasser
 

HMMM, runs just like my MLD 35....
Or my OLD Bully 35, same cylinder as the old 3W 35...About 20 YEARS ago....Maybe I get a new Bowman ring for it and do a little comparing..The cylinder and piston came from a CHAINSAW....
Nothing much new under the sun..The Bully was about 20 YEARS ahead of its time..:D
How about the 3W 28, Pat ? You think your company will be using the NEW technology OS ??
Too funny...:)

RE: OS GT33 33cc gasser
 

For essentially the same price the Syssa looks like the better engine, especially since it has the rear exhaust system so you don't need to buy an aftermarket muffler for tight installations with the Syssa. Plus its made in the USA

Ed

RE: OS GT33 33cc gasser
 

You are right on the initial cost!:) What I should have said is the back end cost. The OS will most likely out last 2 or 3 dle 30's! So you make it up on the back end! And I am not bad mouthing dle. I have three and love all of them! I have an original dl50 and a dle 30 and 20! All are great motors but not up to par with the MVVS 45 and 35 or Zenoah 20 and 38 that i have. I am willing to bet that none of the dle's will out last a single one of the other engines I have! And the OS should be as good of quality. Now on this time will tell.

But for me buying a better quality engine at close to the price of an economy one is something that I am willing to try if the engine has good initial reviews!

RE: OS GT33 33cc gasser
 

Wasp I to have a MVVS 35 that I run on a GP Super chipmunk. Great engine and easy to start! I run a 18X8W APC on mine because of clearance issues. But as for the lower OS rpms though I ran an 18x8 xoar before the wide blade apc and I lost almost 600 rpm using the wide blade but picked up a lot better performance. So I would be interested to know the RPM's of the 20x8w APC on the MVVS?

But in saying that...... Somebody on here a while back made a statement that we RC'ers worry to much about rpm's and HP's instead of how an engine actually performs in the air! I believe it was TOM. And since then I have stopped worrying so much about peak rpm's on mine unless it just does not seem to be opening up at the top. I just worry what the plane performs like in the air.

This is my ESM Corsair that has a 18x8w APC. The plane weights almost 19 and a half pounds and the G-38 engine just pulls it great! Have no Idea what the top RPM's are!

RE: OS GT33 33cc gasser
 

And chances are, the OS will use an iron liner instead of the plated cylinders most others use. The iron liner is heavier and has less heat transfer into the fins because it is not in intimate contact like plating is.

RE: OS GT33 33cc gasser
 

skillet92
You are so right.

Everyone should read a book called "CHEAP- The high cost of Discount Culture".... it really exemplifies the american agenda....and our own demise...

RE: OS GT33 33cc gasser
 

Not in intimate contact?

A press fit is a very intimate fit between aluminium and steel.
Steel liners allow for better honing marks therefore better oil retention. AL makes a great heat sink so heat transfer is not impeded.


The advantage of Nicasil plating is that is it lighter and expands with the aluminium allowing closer tolerances between bore and piston as well as better heat conductivity and therefore better cooling. Postplating honing is typicaly done so oil retention isexcellent but the honing process needs to be conducted more carefully to prevent cracking of the plating.
However in time the platingcan start to flake if fuels with high sulphur is used I.e. AVGAS 100LL @ 0.1% wt or 1000ppm. Not an issue for pump gasoline.
The O.S GT33 will be more resistant to AVGAS over time than e.g. a DA or DLE.

There is nothing wrong with nicasil plated engines. In fact they are superior to lined engines in terms of specific power output (all else being equal). It is a common process used in many high perormance engines today e.g Porsche 911 Turbo, GT, GT2, GT etc, Audi R8, and TFSi range, BMW N14, N35 (335i),Mercedes and Ferrari F1 engines

The OS GT33 is nothing special and not what I expect from OS. Others will no doubt differ

RE: OS GT33 33cc gasser
 

I don't care about carb position or what mounts it has as long as it fit's my modell and it runs great for a fair price.
To my knowledge it's not the first engine they build so they should know about those things.
I don't know the drive for carb position, is it technical? marketing? I know 3W builds engines with side carb for the US?
don't understand a "sikkepit" what's the purpose of that.
Basically I believe OS know what their doing, but they suffer price pressure and that leads to economic alterations wich
many times turns out ... ( by the way, is it "which" or "wich", one of them is wicked old woman) if not fatal, then quasi fatal.

RE: OS GT33 33cc gasser
 

""Somebody on here a while back made a statement that we RC'ers worry to much about rpm's and HP's instead of how an engine actually performs in the air! I believe it was TOM""

for the most part I do agree with that statement,, and I have to say I bought my MVVS 35 with knowing very little about it, I just knew it was not a cheap Engine

Jim

RE: OS GT33 33cc gasser
 

thats four pounds of thrust difference

RE: OS GT33 33cc gasser
 

Alright so the Tower page states:

FEATURES: Electronic ignition accepts LiFe, LiPo, NiCd and NiMH power and also
offers low voltage warning

REQUIRES: Ignition Battery: 4.8-6.0V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack
LiPo battery requires voltage regulator

So I'm confused. If it "accepts" a LiPo why is a voltage regulator required?

RE: OS GT33 33cc gasser
 

you need a voltage regulator because working voltage for the ignition is from 4.8 to 6 Volt max. LiPo batteries will provide 7.4 Volt (if you use LPo 2S without a voltage regulator you will pretty much toast you ignition)...

RE: OS GT33 33cc gasser
 

I was hoping by some chance OS was leading the way and was going to be the first with a high voltage ignition. The last glow plane I built was all HV with Hitec HS-5495BH servos and a Hitec Optima 6 rx.

RE: OS GT33 33cc gasser
 

And the mvvs weighed a pound more. Four pounds of thrust for an extra pound of weight? If you want light for a aerobat, maybe the OS, Mintor or DLE would be better, if you can use the extra weight and thrust in a tail heavy plane get a MVVS. It's all what YOU want. There are so many engines, good, bad, cheap, expensive. Buy it, fly it, crash it, sell it. Who cares, lifes too short.
Weight wise the Mvvs 26 is more on par with the OS 33. The 26 is weak by comparison. 17X6@ 8800 on a regular muffler. Apples to apples otherwise we may as well compare the DA 60 to the MVVS 35, right?
The OS looks like a nice engine and I'm sure the fit and finish are as good as any other engine on the market, including a Mintor. It's all a matter of personal choice. What engine fits in the cowl, what engine balances out the plane, what engine makes you happy. If you want the most durable get a Zenoah or other industrial/chainsaw conversion.

The GT-33 Gasoline Engine produces 10% more power than any other engine in its class! An electric ignition system offers fast, easy starting and accepts LiFe, LiPo, NiCd and NiMH power. The E-5030 muffler resists distortion, resulting 5dB less noise than the competition. Includes a Walbro carb and CM-6 spark plug.


Specifications
Displacement: 2.013 in3 (32.98 cc) Bore: 1.417 in (35.99 mm) Stroke: 1.276 in (32.41 mm) rpm Range: 1000-8000 Total Weight: 43.39 oz (1230 g) Engine: 34.57 oz (980 g) Muffler: 4.94 oz (140 g) Ignition: 3.88 oz (110 g)
Requirements: 2-cycle oil, 4.8-6V (4-5 cell) NiCd or NiMH or 7.4V (2S) LiPo or 6.6V (5.5-cell) LiFe battery pack, Voltage regulator (LiPo use only) and 18x8 prop (for break-in); 18x10-12, 19x10 or 20x8-10 (for subsequent use)

RE: OS GT33 33cc gasser
 

3w has done it... my ignition handles up to 8.5 volts and mvvs/evolution handle the same if im not mistaken

RE: OS GT33 33cc gasser
 

ZDZ also