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So what is the verdict for the tower hobbies 75?

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So what is the verdict for the tower hobbies 75?

Old 09-30-2009, 11:44 PM
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Alex7403
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Default So what is the verdict for the tower hobbies 75?

Hi,
I must say that I’m spoiled flying only OS’s 46 LA, 46 AX, 75AX, 91 FX
Never had a dead stick without a good reason for it.
My OS's flip start every time, while others flooding their motors.
Maybe building this winter a Goldberg Chipmunk 60 (6-8 lb > 9 lb more likely)

Thinking if to get the tower hobbies 75, it’s priced well and should pull some 7 lb airplanes I have.
Can the tower 75 accept some kind of pitts muffler or similar, will the OS 91 FX accept the same muffler?

If I need more than one gallon of fuel to break it in its not worth it.
If I have to monkey with it to adjust it every week of flying its not worth it.
My choice is if to put 91 FX on a 60 size airplane or to get the tower 75.

How reliable is tower 75?

Thanks
Alex
Old 09-30-2009, 11:53 PM
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w8ye
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Default RE: So what is the verdict for the tower hobbies 75?

One of the greatest engines ever made is the Tower 75

The 61FX has never celebrated the success of the OS 61 SF mainly because of 75 and 91 engines coming on the market in 61 size cases
Old 09-30-2009, 11:58 PM
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Default RE: So what is the verdict for the tower hobbies 75?

I've have a Tower .46 and .61 and both were great engine and had strong power.  Proper break in, use 2.5 additional ounces of castor per gallon of fuel and it'll run forever.  

Simple to tune in and make it purr.  Settings seemed to hold up quiet well.  I never had to tinker with these engine to keep them going. 

I always use Marvel Mystery Air Tool oil as an after run oil and it works great.
Old 10-01-2009, 04:42 AM
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estradajae
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Default RE: So what is the verdict for the tower hobbies 75?

On this forums the Tower 75 is never underrated.

mine turnes a scimitar 12x6 at about 14000RPMS...no dead stick, very reliable engine.... and muhc lighter than the o.s
Old 10-01-2009, 06:50 AM
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Default RE: So what is the verdict for the tower hobbies 75?

My Tower .46 flip starts easier than any OS LA.
Old 10-01-2009, 07:32 AM
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Default RE: So what is the verdict for the tower hobbies 75?

Sometimes I think twice before spending money on an OS, but I never regret doing it.
Old 10-01-2009, 08:27 AM
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Default RE: So what is the verdict for the tower hobbies 75?

The strongest OS fans have seldom tried anything else...
Old 10-01-2009, 09:44 AM
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Default RE: So what is the verdict for the tower hobbies 75?

There is no comparison whatsoever between the two engines. The Tower .75 will mop it up with out even breaking a sweat. It is also just as reliable. I have two allready, and they are my most favorite engines ever. Last night I ordered two more for a twin project. The Tower .75 will run circles around the competition. The picture below of the Shoestring/Tower .75 combo with over 13 gallons through it was Taken at War Birds and Classics over the Midwest 2009.
Just ask anyone who was there about the little Yellow airplane. I was just as fast as most of the Turbines there that weekend while I was running an 11&3/4-11 pattern prop. The White plane is also powered by a Tower .75.
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Old 10-01-2009, 09:50 AM
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Default RE: So what is the verdict for the tower hobbies 75?

Thanks for the replies,
Do you guys think the tower 75 is much different than GMS 76?
Old 10-01-2009, 10:01 AM
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estradajae
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Default RE: So what is the verdict for the tower hobbies 75?

The engines are quite similar, being made by the same factory and interchanging many parts....GMS make the engines for tower, BUT, the engines offered by GMS and the Tower engines are indeed different...

The GMS 76 is ringed, the Tower 75 is ABC, I don't have any experience with the GMS, but I've read here some people say the GMS is as good as the tower....but maybe since the tower is ABC, it may produce a little more power, but I can't assure it.....maybe they are ported different???
Old 10-01-2009, 10:20 AM
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Default RE: So what is the verdict for the tower hobbies 75?

I have owned the Tower 75 and found it to be nothing special. Smaller displacement than my ASP XLS 91 but also less power. Difference in weight was only 1 oz because the ASP 91 is much lighter than the 91 FX which I also own. The 91 fx and ASP XLS 91 was exactly the same power, but the ASP was less weight. This made the Tower 75 obsolete for me so I sold it to use my ASP instead. The Tower ran great and started easy though.

To sum it up: ASP XLS 91 is a just hair heavier, actually cheaper, stronger and runs as great as the Tower
Old 10-01-2009, 10:24 AM
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Default RE: So what is the verdict for the tower hobbies 75?


ORIGINAL: estradajae

The engines are quite similar, being made by the same factory and interchanging many parts....GMS make the engines for tower, BUT, the engines offered by GMS and the Tower engines are indeed different...

The GMS 76 is ringed, the Tower 75 is ABC, I don't have any experience with the GMS, but I've read here some people say the GMS is as good as the tower....but maybe since the tower is ABC, it may produce a little more power, but I can't assure it.....maybe they are ported different???

I like the Tower version because of the "TRUE ABC CONSTRUCTION". The compression is unreal even after 13 gallons. You can grab one blade of the prop and lift one tire off the ground on my 8 lb plane and it will not blead compression off. You can hold it like that untill you are blue in the face.
Also, Towers warranty especially if you are a Super Savor member is an unbeatable 4 years. Also parts shipments if ever needed are free of shipping charges.
Old 10-01-2009, 10:39 AM
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Default RE: So what is the verdict for the tower hobbies 75?

ORIGINAL: asmund

I have owned the Tower 75 and found it to be nothing special. Smaller displacement than my ASP XLS 91 but also less power. Difference in weight was only 1 oz because the ASP 91 is much lighter than the 91 FX which I also own. The 91 fx and ASP XLS 91 was exactly the same power, but the ASP was less weight. This made the Tower 75 obsolete for me so I sold it to use my ASP instead. The Tower ran great and started easy though.

To sum it up: ASP XLS 91 is a just hair heavier, actually cheaper, stronger and runs as great as the Tower

I have owned the Magnum XLS .91 two stroke that I agree runs identical to the OS .91FX, but is not anywhere near as sweet running of an engine as the Tower .75 is. The Tower does not care if you are revving it 14,000+ with an 11-7 or running it in the highs 10's with a 13-7. The engine hardly ever needs to be adjusted, and never gives you any trouble. The needle valve also has two orings which I think is superior to the ASP/Magnum needle valve which allmost everyone I have come across fits reall sloppy and leaks air.
In the US, The Tower engine is the best buy, since the warranty is unbeatable, and the parts are shipped free of charge. If you want a simple $1.00 Magnum part from hobby people, the shippng is still like $8.00 minimum if it is not backordered like most of there parts normally are.

It looks like the .91 is not advertised by Magnum now, but there .61 is $109.00 with a 1 year warranty and you pay shipping.
http://www.hobbypeople.net/gallery/210770.asp

The Tower .75 is $99.00 with a four year warranty if you are a club member, and everybody knows about there quopons.
http://www3.towerhobbies.com/cgi-bin...&I=LXUR78&P=SM

Don't take me the wrong way, I love Magnum/ASP's, but the Tower .75 is my favorite choice hands down.
Old 10-01-2009, 10:59 AM
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Default RE: So what is the verdict for the tower hobbies 75?

One of the guys I fly with bought a Tower 75 some four years ago.

It is the only engine he has and has well over 100 flights on the engine

No problems, no parts needed, trouble free
Old 10-01-2009, 01:10 PM
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Default RE: So what is the verdict for the tower hobbies 75?


ORIGINAL: MOTORMAN37
It looks like the .91 is not advertised by Magnum now, but there .61 is $109.00 with a 1 year warranty and you pay shipping.
http://www.hobbypeople.net/gallery/210770.asp

The Tower .75 is $99.00 with a four year warranty if you are a club member, and everybody knows about there quopons.
http://www3.towerhobbies.com/cgi-bin...&I=LXUR78&P=SM

Don't take me the wrong way, I love Magnum/ASP's, but the Tower .75 is my favorite choice hands down.

You do your shopping in the wrong place, look at this: http://www.hobbycity.com/hobbycity/s...1&ParentCat=55

They used to have the .91 too at about 70$, I guess they are out of stock for now, go figure
Check out the price of the rest of the engines
shipping isn`t too bad either, I have 63 orders from them on my account and when you get to be a gold member you don`t even pay the advertised prices anymore, he he.
The 180 fs is over 100$ cheaper here than all other places I have checked

Anyway, I fully agree that the Tower really are a great engine, I used to turn 15000 rpm on APC 12.25-3.75 with mine, not so sure my beloved ASP 91 or 91 FX would have liked that, but on a 13-6 the ASP outrun the Tower with over 1000 rpm and still weighed almost the same
Old 10-01-2009, 02:50 PM
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Default RE: So what is the verdict for the tower hobbies 75?


ORIGINAL: asmund


ORIGINAL: MOTORMAN37
It looks like the .91 is not advertised by Magnum now, but there .61 is $109.00 with a 1 year warranty and you pay shipping.
http://www.hobbypeople.net/gallery/210770.asp

The Tower .75 is $99.00 with a four year warranty if you are a club member, and everybody knows about there quopons.
http://www3.towerhobbies.com/cgi-bin...&I=LXUR78&P=SM

Don't take me the wrong way, I love Magnum/ASP's, but the Tower .75 is my favorite choice hands down.

You do your shopping in the wrong place, look at this: http://www.hobbycity.com/hobbycity/s...1&ParentCat=55

They used to have the .91 too at about 70$, I guess they are out of stock for now, go figure
Check out the price of the rest of the engines
shipping isn`t too bad either, I have 63 orders from them on my account and when you get to be a gold member you don`t even pay the advertised prices anymore, he he.
The 180 fs is over 100$ cheaper here than all other places I have checked

Anyway, I fully agree that the Tower really are a great engine, I used to turn 15000 rpm on APC 12.25-3.75 with mine, not so sure my beloved ASP 91 or 91 FX would have liked that, but on a 13-6 the ASP outrun the Tower with over 1000 rpm and still weighed almost the same
Sure the price looks nice for the .61, but the shipping would be close to $30.00 which brings the price right up by the Tower .75.
Old 10-01-2009, 02:56 PM
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Default RE: So what is the verdict for the tower hobbies 75?


ORIGINAL: Alex7403

Hi,
I must say that I’m spoiled flying only OS’s 46 LA, 46 AX, 75AX, 91 FX
Never had a dead stick without a good reason for it.
My OS's flip start every time, while others flooding their motors.
Maybe building this winter a Goldberg Chipmunk 60 (6-8 lb > 9 lb more likely)

Thinking if to get the tower hobbies 75, it’s priced well and should pull some 7 lb airplanes I have.
Can the tower 75 accept some kind of pitts muffler or similar, will the OS 91 FX accept the same muffler?

If I need more than one gallon of fuel to break it in its not worth it.
If I have to monkey with it to adjust it every week of flying its not worth it.
My choice is if to put 91 FX on a 60 size airplane or to get the tower 75.

How reliable is tower 75?

Thanks
Alex
This is copied from Tower COMMENTS: The Bisson Pitts Muffler for the GMS .76 engine. BISG1176 also fits
this engine.

No other muffler that I am aware of will fit it without a little work. If you can run the Stock muffler, it will reward you with quite a power Boost over a Pitts muffler though.
Old 10-01-2009, 03:03 PM
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estradajae
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Default RE: So what is the verdict for the tower hobbies 75?

You can also put FAI fuel on the tower and runs just as good!

I guess all the engines you can buy around there take longer to achieve maximum performance than an O.S engine, both ringed and ABC/ABN. The engines worth does not go if they break in faster...Just my humble opinion.

look at my video [link=http://www.youtube.com/user/estradajae#play/all]here[/link] that is after about 14 oz tanks with FAI fuel (yes 80% methanol 20% castor oil)....with a 12x6 scimitar prop, at about 14xxx RPM at full power (not remember the exactly number). I removed the thick gasket....
Old 10-01-2009, 03:30 PM
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Default RE: So what is the verdict for the tower hobbies 75?

ORIGINAL: Alex7403

Hi,
I must say that I’m spoiled flying only OS’s 46 LA, 46 AX, 75AX, 91 FX
Never had a dead stick without a good reason for it.
My OS's flip start every time, while others flooding their motors.
Maybe building this winter a Goldberg Chipmunk 60 (6-8 lb > 9 lb more likely)

Thinking if to get the tower hobbies 75, it’s priced well and should pull some 7 lb airplanes I have.
Can the tower 75 accept some kind of pitts muffler or similar, will the OS 91 FX accept the same muffler?

If I need more than one gallon of fuel to break it in its not worth it.
If I have to monkey with it to adjust it every week of flying its not worth it.
My choice is if to put 91 FX on a 60 size airplane or to get the tower 75.

How reliable is tower 75?

Thanks
Alex

I think you've answered your own question....you're already using the best.

If you're going to spend all that time to build the kit use an engine you're comfortable with.

For an ARF with little emotional value go ahead and try the $99 engine. Maybe 1/2 of it's original price once used.

To quote Dave Platt; The weak link in the RC Scale reliability chain is still - the engine.

Just my opinion...
Old 10-01-2009, 03:31 PM
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Default RE: So what is the verdict for the tower hobbies 75?

ORIGINAL: MOTORMAN37
Sure the price looks nice for the .61, but the shipping would be close to $30.00 which brings the price right up by the Tower .75.

Do you get free shipping from Tower?

http://www3.towerhobbies.com/cgi-bin...&I=LXUR78&P=SM
Old 10-01-2009, 11:27 PM
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Default RE: So what is the verdict for the tower hobbies 75?

Hey Alex,

I've got a Tower .75 in a Modeltech Dragon Lady (not exactly sure of the weight). I have the Bisson Pitts muffler on it too. I've had the engine for three seasons now and even after a couple of nasty crashes this thing still runs great.

I have had some problems tuning it in the mid range, it seems to load up a bit, even when the High/Low are dialed in.

I'd buy another one.

Ben
Old 10-02-2009, 01:37 AM
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Default RE: So what is the verdict for the tower hobbies 75?

These tower engines were kind of a riddle for me, it looks cheap but the guys who knows what they are talking about in RC are praising it, i guess i wont know until i try one.
it seems like a good motor, but when you build a kit from one side you want to put the best in it on the other hand I want to minimize the estimated cost of the whole thing.

Thanks again
Alex
Old 10-02-2009, 06:41 AM
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Default RE: So what is the verdict for the tower hobbies 75?



The Tower 75 is a great engine.
Old 10-02-2009, 07:37 AM
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Default RE: So what is the verdict for the tower hobbies 75?


ORIGINAL: asmund

ORIGINAL: MOTORMAN37
Sure the price looks nice for the .61, but the shipping would be close to $30.00 which brings the price right up by the Tower .75.

Do you get free shipping from Tower?

http://www3.towerhobbies.com/cgi-bin...&I=LXUR78&P=SM

I do on any order over $150.00. I useally do not order unless I have a coupon for $20 off of $150.00 order.

http://www3.towerhobbies.com/cgi-bin...?FVGCNUM=014DR
Old 10-02-2009, 07:38 AM
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Default RE: So what is the verdict for the tower hobbies 75?

i see that in the spare parts list that the front bearing for the TH 75 is now a sealed version...................mine had a non sealed front bearing back when i bought mine 2 years ago.
the parts list back then also showed a non sealed FB.

i come from years of competition in which we ran Rossi's and OPS engines exclusively. when i first saw the TH 75 i was stunned at the quality for the price i paid which was 90 bucks a couple years ago.

i had mine on a GP Big Stick (60 size) and this engine literally ripped the wing off. i have never seen such power in such a cheap engine. the only problem i had was it would flame out just between idle and midrange.
finally narrowed it down to the front bearing that was allowing air to pass.
the engine idled fine, but it would not shutoff even with your finger over the venturi. the carb was seated and sealed, but still wouldn't shutoff.
if Tower has fixed this issue then i'd buy another one without even thinking about it.

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