Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Tower .75 any good?

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Old 06-03-2007, 10:49 PM
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justinh
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Default Tower .75 any good?

Is this motor any good for turning high rpm? I'm looking for a good engine to put on my nitromodels bobcat. Currently I have an old OS .61 SF on it turning an APC 10x8 pusher. It flys really nice but I'd like it to go alot faster. Should the tower be able to out turn the old OS? Would it be possible to regrind the ports to get it happier running in a higher rpm range? Pusher prop selection sucks, all I can find is 10x6-7-8 and 11x6-7. What other engines would you guys recommend? I spose a Jett .90LX with a reversed crank would be optimal but its too expensive for a $100 airplane.
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Old 06-04-2007, 12:18 AM
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buddude8
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Default RE: Tower .75 any good?

only experience i have had with this engine is in a 60 size U CAN DO. Incredible engine for the price. With a 10x8 pusher prop i would say you would hit somewhere from 12500-13000 rpms.

ken
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Old 06-04-2007, 01:19 AM
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rmenke
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Default RE: Tower .75 any good?

Justinh:

If you want a outstanding engine for a reasonable buck, get a Webra 55 and equip with a Jett pipe. It will turn a 9 X 10 apc around 18k, yess I said 18K. The Jett 60 Lx is my favorite engine of all time. Saturday was our club race for the month, I crashed my go faster 60LX powered racer early in the week. Flew a backup, Webra 55 powered. Another plane was flown by my 30 something nephew, Jett 60 LX powered. Airframes are identical, I built them both the same. Near same start on two races, was able to pull away, slowly but shurly. Goofed third start, was half lap down, still able to run him down and pass at about lap 7 of 10. Now I could claim I am a better pilot, but impossible for a old fart of 73. Yesss, good at mind games and other old and tretcherous tricks, but surly not 3 for 3. The others flatly got lapped so the Jett 60 LX could not have been running that badly. Try the Webra 55, but do not tell the Dude Brothers about this engine as they will surly kill me with one in the future, maby when I hit 80 or so. Ohhhhhhhhhhhh, yea sort of calling you guys out, yet again, sorry you could not make it this year. ENJOY Bro 119
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Old 06-04-2007, 06:38 AM
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soarrich
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Default RE: Tower .75 any good?

For the buck a great engine and an ounce lighter than the 60, but probably not a good speed engine.

My buddy has a Nitromodels Bobcat we've been flying with OS 46 FX, he just put a Tower 75 in it yesterday so I'll let you know what it turns with a 9x7 3 bladed prop Tuesday. Cool sounding plane though,crisp on the ailerons, but the elevator is a little soft. We fly off grass and had to lock the nose wheel to keep it from tipping over, but it steers fine with the rudders only.
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Old 06-04-2007, 07:19 AM
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Default RE: Tower .75 any good?

I have a 50 size Bobcat with Tower 75 and Zinger 11x8 pusher, awsome performance. Also Little Toni with Tower 75 and pipe. Again awsome performance. If you search Bobcat threads you will see everybody agrees Tower 75 is the best engine for the Bobcat. I have 3 Tower 75s and absolutely love them.
Good Luck
Matty
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Old 06-04-2007, 05:38 PM
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justinh
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Default RE: Tower .75 any good?

what kind of rpms are you getting with the 11x8 pusher?
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Old 06-05-2007, 11:08 PM
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soarrich
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Default RE: Tower .75 any good?

We got 15,500 rpm with the Tower.75 and Master Airscrew 3 bladed 9x7 prop. The prop is a little too small for the engine, but we fly off grass and need the ground clearance. We're going to order some 11x8 2 bladed and put longer gear on it.
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Old 06-06-2007, 06:52 AM
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Default RE: Tower .75 any good?

I first put a Tower .75 on my Bobcat too....and experimented with all available props. With 11X7 APC prop I was able to get a top speed of 110 mph on the radar gun. I then put a Magnum .91 on it and tried all available pusher props for that engine. Didn't get any more speed with the .91 so I went back to the Tower .75. I have a Graupner 11X8 on it now, turning 12,500 on the ground. Haven't got it on the radar gun with this prop yet but it definately is faster.
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Old 06-07-2007, 01:52 PM
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Default RE: Tower .75 any good?

Hey, guys, I just got a promo code, 016D7, from Tower for $20 off for a $50 or more item. The Tower .75 is already on sale for $89.99. With the discount, plus $899 shipping, the total cost is $78.98! That is the best deal around on a great engine. I ordered one just because it was so cheap. My present Tower/11-8 drags my Pole Star flying wing around pretty quick.
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Old 06-07-2007, 05:04 PM
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Default RE: Tower .75 any good?

hey guyz zinger sells an 11x10 you should check that out
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Old 06-11-2007, 08:29 AM
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Default RE: Tower .75 any good?

I had three Tower 46s. All of them ran good and were very powerful. Two of them developed cracks in the crankcase and started performing erratically.

I bought a Tower 75 in Feb, and couldn't ever get it to run right due to two bad carbs in a row. The original and the replacement had a poor machining job on the throttle bore, and after about an hour of operation, the throttle locked up and couldn't be moved. With either carb, the engine acted like it had an air leak. (Slow or no return to idle. Impossible to shut down with the throttle.)

Are they any good? IMHO, no. I'm buying OS from now on.
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Old 06-11-2007, 09:36 AM
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CrashPro
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Default RE: Tower .75 any good?

I also have 3 Tower .46's too,..all great running engines...no problems with those.
I have a .61 and a .75 too....both with the same problem,..run great,....but will not shut down,....can actually put my finger over the carb and they continue to run. Anyone know a fix for this?
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Old 06-11-2007, 10:25 AM
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brewski
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Default RE: Tower .75 any good?

Check for an air leak around the o-ring of the carb.
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Old 06-15-2007, 06:49 PM
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MOJO65-9or10
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Default RE: Tower .75 any good?

ANyone fly 3D with a tower 75 and if so what prop are you all running. The reason I ask isn't that I am going to do 3D but I want some stump pulling power for a 40 size cub. I am thinking either a 13x4W or a 14x4W?

What do ya think?,
Dave
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Old 06-26-2007, 11:27 AM
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Default RE: Tower .75 any good?

I have a Tower .75 now. With a 12x6 MAS I saw 13,800 on an optical tach. Jumped to 13,900 a couple times, but seemed to settle in the 13,800 range.

Good luck,
Frank
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Old 06-27-2007, 01:22 AM
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justinh
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Default RE: Tower .75 any good?

I ended up buying one. Was running a zinger 11x8 pusher prop and it disintegrated mid flight =(
Anyone know the max rpm limit for a wood prop? It was the best engine i've tried so far on the bobcat.
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Old 06-27-2007, 04:54 AM
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CrashPro
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Default RE: Tower .75 any good?

Hey justnh

I've tried every available pusher prop for my Tower .75 on my Bobcat, and by far the best is the Graupner 11x8. Really moves out with this prop.
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