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Super Tigre 90 propeller advice

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Old 07-24-2007, 09:16 PM
  #1
jigeye
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Default Super Tigre 90 propeller advice

I have a ST G90 on a SIG 4 Star 60. I've been using a 13X7, however, I would like to get a little more pull.
The recommended prop chart only goes up to a 13X7, however, I've been told a 14X6 will work well. I'm hesitant to use it since it is not on the chart and I don't want to damage the engine.
1. Will a 14X6 provide more pull?
2. Will it damage the engine?
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Old 07-25-2007, 12:48 AM
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Default RE: Super Tigre 90 propeller advice

#1 Yes you`ll have pull Slower speeds but more pull .
#2 No , it will probably love it.
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Old 07-25-2007, 10:09 AM
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Default RE: Super Tigre 90 propeller advice

A 14 x 6 is one prop that you can use, and it won't hurt the engine. It depends upon what you mean by "more pull". If you mean more static thrust, then the 14 x 6 will be OK. We usually, though, go for more RPM, and would investigate a 12 x 8 prop or so...turn the engine near 12,000 RPM and use whatever prop will turn that RPM and fly your model the way you like it. Too many people put too-large props on the G-90 and turn it too slowly. It runs very well in the high 11,000's and the carb works nicely when the engine's propped for that RPM.
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Old 08-21-2007, 12:01 AM
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Default RE: Super Tigre 90 propeller advice

Bill

I have a .90 running on a Keekat. Its for speed in a pusher config. About all we can find is an APC 11x7 and a graupner 3 blade 12x8. Kind of in between. do you think the 11x7 will be ok??

My assumption is the3 blade 12x8 will be maybe a bit too much resulting in too low for rpm.

I wonder which one will be faster top end. We will also probably try the wood zinger 11x8. But cannot find a 2 blade 12x8 pusher or an APC 12x8 or 11x8. I am trying to get about 110mph. What is the true max rpm I can safely run?

any ideas on pusher props?

Also, looking for a tuned pipe recommendation, remembering its in a pusher config. I think if I had a touch more power, the 3 blade 12x8 graupner would spin up there.

First engine runs with the 3 blade is this weekend or early next week. apc 11x7 is on backorder.

I have heard there are guys turning the 11x7 at 15,000 rpm with the .75s thus my concern.
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Old 08-21-2007, 10:03 AM
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Default RE: Super Tigre 90 propeller advice

We'd consider an 11 x 8 propeller or smaller too small. You'll get the engine to wind up, have a lousy idle and acceleration, and likely not last long at all.

For a pusher, your best bet is to get a prop that's slightly too large and start to cut it down until you get the performance you want..or close to it. Because pusher props are not made in very many sizes, that's the only way to get one that will work out.

With a pusher, you'd have to get a tuned pipe that had the exhaust outlet turn 180 degrees because you'd have to have the pipe pointing forward...remember, the prop would be in the way of mounting it so it went aft. That turn in the outlet tube would affect the pipe tuning, so you'd have to make one and 'try and see' for how it would work. There's no "off the shelf" answer here.
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Old 08-21-2007, 01:45 PM
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Default RE: Super Tigre 90 propeller advice

Thanks bax
we will start with the graupner 3 blade 12x8 and work from there.

APC PLEASE MAKE A 12x8 PUSHER!!!!!!!!!!!!!!!!!!!!
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Old 02-24-2008, 09:52 PM
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Default RE: Super Tigre 90 propeller advice

we are running a 15x4 prop on a g90 in a modeltech excite
it the best combo yet
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Old 02-25-2008, 07:43 PM
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Default RE: Super Tigre 90 propeller advice

Im running a 15x4W on my .90 Fusion and it rocks but for the keecat, we cannot find a good pusher that has good thrust and speed both. so far the Graupner 11x8 is the best, but we are overreving the motor and prop to about 15,000 rpm, so we are being very careful. It has a Jett muffler and is pretty bad***** on the power range, but I want an 11x9 or 10 pusher which doesn't exist.

Even an 11x8 apc pusher would be good and more efficient.
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Old 02-25-2008, 10:08 PM
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Default RE: Super Tigre 90 propeller advice

How about an 11 x 7? APC # LP1107P

Or a 10 x 8 pusher prop? APC # LP1008P

I think APC props are hard to beat. http://www.apcprop.com/


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Old 02-25-2008, 10:45 PM
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Default RE: Super Tigre 90 propeller advice

the 10x8 cannot make the required thrust, the 11x7 is just too flat for this motor. It does well on a tower 75, but its just too flat for this motor. It turned the graupner 14000 when it was on the stock muffler, which is really too fast for it. the 11x7 turned over 16k stock, which will destroy it in short order. what I need is an 11x9 apc.
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Old 02-26-2008, 02:27 AM
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Default RE: Super Tigre 90 propeller advice

A good heat gun and some careful planning you can change the pitch of an APC prop.
From what I understand it is done often.
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Old 04-24-2008, 03:23 PM
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Default RE: Super Tigre 90 propeller advice


Quote:
ORIGINAL: Bax

A 14 x 6 is one prop that you can use, and it won't hurt the engine. It depends upon what you mean by "more pull". If you mean more static thrust, then the 14 x 6 will be OK. We usually, though, go for more RPM, and would investigate a 12 x 8 prop or so...turn the engine near 12,000 RPM and use whatever prop will turn that RPM and fly your model the way you like it. Too many people put too-large props on the G-90 and turn it too slowly. It runs very well in the high 11,000's and the carb works nicely when the engine's propped for that RPM.
Sorry to rake up an old thread but I'm having trouble working out something here.

In the above post you say "Too many people put too-large props on the G-90 and turn it too slowly. It runs very well in the high 11,000's"

but in [link=http://www.rcuniverse.com/forum/fb.asp?m=4721011]this post[/link] you say "If you are turning the engine (G90) at 10,000 RPM, then you are turning it about as fast as is reasonable. We normally turn the engine just below 8,000 RPM.".

Can you advise which of these seemingly contradictory recommendations is correct?
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Old 04-20-2014, 10:38 AM
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Im using a 15x8 on my 90. Bowman ring and BOCA bearings! Im going for 16x6. Its on a great planes revolver. With slim line pits! Pulls like a train! Wil post vids on tube!
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Old 04-21-2014, 06:21 AM
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We'd consider that propeller size to be much too large for the G-90. You want to prop it so that it will turn in the high 11,000's. Anything much larger than a 14 x 6 will not allow that to happen. We really like a 12 x 8 or 13 x 6. They'll allow the engine to turn up and run very well with excellent handling.
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Old 04-21-2014, 02:44 PM
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I thought that as well! But my gosh it unloads and really screams. Almost sounds like it can explode anytime. I will post a video on YouTube! Under Ernie Flabbi. Let me know what you think!
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Old 04-21-2014, 03:29 PM
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14X6 APC is a great Sport / Warbird prop. A 13x6 is what I would use on a 3D plane. I even like the MA black 13x6 in this instance. Most of the time the APC is a better choice.

David
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Old 04-22-2014, 02:48 AM
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You guys have to hear it for your selves! Its an apc 15x8. 15% wildcat fuel. I know what the prop range is. Still in disbelief at how much this thing spoons up. And never a dead stick landing.

Last edited by warbird72; 04-22-2014 at 02:50 AM. Reason: added more
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Old 04-22-2014, 06:21 AM
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OK, this is not a discussion forum, but a manufacturer's direct support forum.. If you want to have a discussion, please take it to the general Glow Engines Forum.

Thank you.
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Old 04-22-2014, 01:43 PM
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Hello Bax. Sorry wasn't aware the tread was in wrong spot. Please forgive me! I googled prop size and it took me to last post. Ernie.
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Old 04-23-2014, 06:34 AM
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Not a problem. This is a forum where the SuperTigre support staff can answer questions about SuperTigre engines. Asking about prop sizes is OK, Having a continuing discussion about them with other RCU members is not OK (in this forum).
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