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Os gt15!

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Old 11-21-2013, 08:39 AM
  #1
ameyam
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Default Os gt15!

Just saw this on Tower

http://www3.towerhobbies.com/cgi-bin...&I=LXDUWC&P=ML

Anyone has one? Its 150g heavier than compapable glow

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Old 11-21-2013, 08:46 AM
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right about the same weight as evolutions 15gx though…. very cool, i was wondering when we'd see this
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Old 11-21-2013, 08:51 AM
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$350 for a 90 sized engine. Wow.
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Old 11-21-2013, 08:56 AM
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Quote:
Originally Posted by irocbsa View Post
$350 for a 90 sized engine. Wow.
Personally speaking, I think I would opt perhaps for a DLE-20 engine or something comparable for $100.00 less. But then again, I did buy the OS GT 22.

Guess it will all depend on the size of your wallet and what your going to use it in. But then again, I only carry a money clip and not a wallet.
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Old 11-21-2013, 09:39 AM
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I bought the 15GX for $249, you can get the OS GT15 for $290-$300 depending on the monthly discount. If you buy at tower and don't use the discount… well thats just silly.

The DLE20/GT22 vs the 15cc engine size argument I find interesting. The prices are similar… the weights are similar. What I found though with planes like my ultrasport .60 ( that currently has my 15GX in it ) that are true .60 sized planes is that there is no way your going to 1, fit a 20cc engine in the nose and 2, have the prop clearance needed for a 20cc sized engine. The 15cc engines here end up being a great option that provide more than enough power for a true .60 sized plane and don't give you the issues that the 20cc engines would have being retro-fitted in these planes.

I have the GT22 as well, I had originally tried to fit it in the US, I wasn't happy with the outcome. the 15cc sized engines are a pretty decent solution, and more than powerful enough for this sized plane ( ~7lbs. )
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Old 11-21-2013, 09:53 AM
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Deleted, post twice ...
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Old 11-21-2013, 11:39 AM
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Quote:
Originally Posted by mattnew View Post
I bought the 15GX for $249, you can get the OS GT15 for $290-$300 depending on the monthly discount. If you buy at tower and don't use the discount… well thats just silly.

The DLE20/GT22 vs the 15cc engine size argument I find interesting. The prices are similar… the weights are similar. What I found though with planes like my ultrasport .60 ( that currently has my 15GX in it ) that are true .60 sized planes is that there is no way your going to 1, fit a 20cc engine in the nose and 2, have the prop clearance needed for a 20cc sized engine. The 15cc engines here end up being a great option that provide more than enough power for a true .60 sized plane and don't give you the issues that the 20cc engines would have being retro-fitted in these planes.

I have the GT22 as well, I had originally tried to fit it in the US, I wasn't happy with the outcome. the 15cc sized engines are a pretty decent solution, and more than powerful enough for this sized plane ( ~7lbs. )
I always forget about that Tower Discount. That makes it a little more reasonable. It doesn't really matter to me though since I don't have any planes that won't swallow up a 20cc. It might be a great option for your Ultra Sport though.
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Old 11-21-2013, 11:55 AM
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Quote:
Originally Posted by irocbsa View Post
I always forget about that Tower Discount. That makes it a little more reasonable. It doesn't really matter to me though since I don't have any planes that won't swallow up a 20cc. It might be a great option for your Ultra Sport though.
I'm definitely glad they are starting to make the smaller gasser motors,
I think in terms of gasser engines, the O.S. motors are usually reasonably priced once you factor in the tower discount ( they are only available at tower, so you might as well figure it into the price. ) but I'm still a bit disappointed with the cost of gas engines vs comparably sized glow motors. That part doesn't really make sense to me.
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Old 11-21-2013, 12:12 PM
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Quote:
Originally Posted by mattnew View Post
I bought the 15GX for $249, you can get the OS GT15 for $290-$300 depending on the monthly discount. If you buy at tower and don't use the discount… well thats just silly.

The DLE20/GT22 vs the 15cc engine size argument I find interesting. The prices are similar… the weights are similar. What I found though with planes like my ultrasport .60 ( that currently has my 15GX in it ) that are true .60 sized planes is that there is no way your going to 1, fit a 20cc engine in the nose and 2, have the prop clearance needed for a 20cc sized engine. The 15cc engines here end up being a great option that provide more than enough power for a true .60 sized plane and don't give you the issues that the 20cc engines would have being retro-fitted in these planes.

I have the GT22 as well, I had originally tried to fit it in the US, I wasn't happy with the outcome. the 15cc sized engines are a pretty decent solution, and more than powerful enough for this sized plane ( ~7lbs. )
Many hobbyists are powering .60 size aircraft with 20 CC size engines. I personally have run a DLE-20 in a Great Planes Revolver 70 with a 16x8 prop. No problems, not one !
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Old 11-21-2013, 12:40 PM
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That's certainly true, but I can see how it would be difficult to fit a 20 in an Ultrasport with the narrow nose and tiny cowl.

I'm guessing that a lot of the extra cost for gas engines as compared to the glow counterparts is tied up in the ignition module. The difference between the 95AX and the 15GT is about $70 which is close to what an ignition costs.
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Old 11-21-2013, 12:48 PM
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Quote:
Originally Posted by irocbsa View Post
That's certainly true, but I can see how it would be difficult to fit a 20 in an Ultrasport with the narrow nose and tiny cowl.

I'm guessing that a lot of the extra cost for gas engines as compared to the glow counterparts is tied up in the ignition module. The difference between the 95AX and the 15GT is about $70 which is close to what an ignition costs.
We all just match aircraft and power plants the best we can. End result always seems to work out OK.
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Old 11-21-2013, 12:57 PM
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Quote:
Originally Posted by irocbsa View Post
That's certainly true, but I can see how it would be difficult to fit a 20 in an Ultrasport with the narrow nose and tiny cowl.

I'm guessing that a lot of the extra cost for gas engines as compared to the glow counterparts is tied up in the ignition module. The difference between the 95AX and the 15GT is about $70 which is close to what an ignition costs.
good point.
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Old 11-21-2013, 02:44 PM
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I am just glad that there are new and exciting options for those of us who appreciate airplane noise. Just when you think the whole hobby is hell bent for leather towards electric power, something pleasant like this comes along. Considering the awesome reliability of every OS I've ever owned, the cost is well worth the time you get to enjoy a consistent runner.
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Old 11-21-2013, 02:50 PM
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Yes, absolutely! Competition is a great thing for this hobby.
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Old 11-21-2013, 03:32 PM
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Yeah, plus a pump and regulator carb which you don't get on a 9AX.

They'll do it for petrols, but try and buy a pumped 2-stroke glow and they want to charge a King's ransom....
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Old 11-21-2013, 05:32 PM
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Here in Australia the GT15 has a recommended retail price $22 higher than the GT22 (which is $100 more than the DLE 20)

Here are the prop numbers according to OS's latest Japanese catalog.

12x10 10,700
13x10 9,600
13x11 9,000
14x10 8,400
15x8 8,250
15x10 7,800

Last edited by CustomPC; 11-21-2013 at 05:37 PM.
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Old 11-21-2013, 06:15 PM
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Does it have a needle bearing or is it just a converted glow engine? I had a JBA 15 and it was great except you have to run 25:1 oil so you have to take two different cans of fuel to the field if you have other gassers that use 50 or 40:1. The better deal may be the Aerovate or CRG 15. They run lower oil content because of the needle bearings instead of bushings on the con rods.
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Old 11-21-2013, 06:53 PM
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doesnt answer the question of weight though

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Old 11-21-2013, 07:10 PM
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According to Tower's specs you have to run 25:1.
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Old 11-21-2013, 07:29 PM
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Quote:
Originally Posted by chris1971 View Post
Does it have a needle bearing or is it just a converted glow engine?
OS's Web site in Japan says

"Special shell type roller bearing is installed at the connecting rod big end. This enables to run the engine with 50:1 mixture gasoline"


Here is the link: http://www.os-engines.co.jp/2013/gt15_e/
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Old 11-21-2013, 07:53 PM
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what liner does it have? Chrome? Nickel? Steel Sleeve? I like the idea of a steel sleeve....can't peel like chrome. It escapes me as to why OS (or anyone else) would want to use nickel-plated liners. How much could they possibly be saving vs a chrome liner or a steel sleeve? If OS had to raise the price of their engines $20 to start putting chrome liners in them then they should do it.
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Old 11-21-2013, 08:06 PM
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Why are you raising the old Nickel liner peeling debate again. That has been done and dusted as was only a few of their older glow engines with ABN cylinders (the B stands for Brass).

This is a ringed engine based on what looks like their old .91FX which, (correct me if i'm wrong), was steel sleeved.

With the extra heat generated by Gas compared to Glow i'm pretty sure this engine would be steel.
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Old 11-21-2013, 11:01 PM
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Ok. I was hoping this engine could replace the 110FS on my Reactor Bipe. The 110FS weighs 650g with muffler and this one weighs nearly 900. With the 110, the airplane is only just tail heavy. I tried a dle20 on it and it was psuhing 4Kg with that in the condition I have the airplane in. Doesnt look like the gt15 will work for me for 3D

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Old 11-22-2013, 06:18 AM
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From Tower's website:

25:1 fuel/oil mixture if brand of oil states 50:1 mix

I'm not going to get into the oil ratio/brand debate but I'm thinking that hobby services might deny warranty claims if you run 50:1. Remember that smaller engine always need more oil than their bigger siblings.
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Old 11-22-2013, 06:53 AM
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Quote:
Originally Posted by CustomPC View Post
Why are you raising the old Nickel liner peeling debate again. That has been done and dusted as was only a few of their older glow engines with ABN cylinders (the B stands for Brass).

This is a ringed engine based on what looks like their old .91FX which, (correct me if i'm wrong), was steel sleeved.

With the extra heat generated by Gas compared to Glow i'm pretty sure this engine would be steel.
I'm not trying to raise a debate...just asking about the liner. From what I understand, OS continues to use nickel-plated liners in their engines, even ones with rings. Yes, one would think that it would have a steel liner, especially at this price, but one would also think that their glow engines would have ABC liners and not ABN. I guess we'll find out soon.

$350 is steep, but as someone pointed out the Tower discount would likely get the price to around $300. That's still a bit steep, but if it performs better than it's competitors then I guess there's some value there.
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