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RE: Nitro models pusher Bobcat? - 2/24/2009 10:48 PM   
HeliTB



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Status: offline 		SinCityJets...I posted your link for the Bobcat/Falcon .25 turbine video in the other RC ???? website where we actually discuss the Bobcat .25 electric/nitro, well mostly electric. I thought the guys would like to see what Kolibiri is up to.

Are you offering any discount or financing options? :-) LOL


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RE: Nitro models pusher Bobcat? - 3/2/2009 4:49 PM   
airborne14830


 

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Status: offline 		What is the right way to install the pusher prop on the engine? I have an APC 11x7 I want to install. Do the numbering 11x7 face the the nose of the plane or does the numbering face the rear?

Thanks

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RE: Nitro models pusher Bobcat? - 3/2/2009 7:00 PM   
HeliTB



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Status: offline 		If it is a pusher prop 11x7p the writing should be toward the motor, meaning toward the front of the airplane.


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RE: Nitro models pusher Bobcat? - 3/2/2009 7:13 PM   
Crazy4Flight



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quote:

ORIGINAL: airborne14830

What is the right way to install the pusher prop on the engine? I have an APC 11x7 I want to install. Do the numbering 11x7 face the the nose of the plane or does the numbering face the rear?

Thanks


to the rear.....for APC

CAUTION: it depends on the brand of prop you use !!!

on wood props from topflite the writing faces forward.
on APC props the cast in numbers face to the rear ( it mounts just like an APC tractor prop on regular airplane)

bob

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RE: Nitro models pusher Bobcat? - 3/3/2009 12:14 AM   
airborne14830


 

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Status: offline 		The prop is an APC 11x7p with cast in numbering so which way is the numbering facing ( towards the front facing the engine or nose, or is the numbering facing away from the engine and twowards the elevator)? just looking for clarification

Also, does it mater that i balance the plane inverted?

thanks

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RE: Nitro models pusher Bobcat? - 3/3/2009 12:42 AM   
Crazy4Flight



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Status: offline 		the numbers would be facing the eleevator,.

APC pusher props mount tho your motor in the same way a tractor prop

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RE: Nitro models pusher Bobcat? - 3/3/2009 12:47 AM   
HeliTB



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Status: offline 		I have an OS AX .55 with 11x7p and the writing is toward the nose and the engine. It's an APC. I've flown my Bobcat twice.


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RE: Nitro models pusher Bobcat? - 3/3/2009 1:03 AM   
Crazy4Flight



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Status: offline 		it is on backwards! it will make thrust but not as much as it should.

in this case you have enough power to make the plane fly.

look at the hub of the prop lettering like C-2 should be towards the prop nut - elevator
look at the hub of the prop lettering like 11x7P should be towards the prop nut - elevator

you will be astounded by the proformance gain.

I once had one on bassackwards and it was lathargic.

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RE: Nitro models pusher Bobcat? - 3/3/2009 1:10 AM   
airborne14830


 

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Status: offline 		Thanks for the feedback, I will make that happen. Also how about balancing the plane, I did mine inverted any issues with that?

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RE: Nitro models pusher Bobcat? - 3/3/2009 1:15 AM   
Crazy4Flight



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Status: offline 		no just makes the task of balance easyer nose or tail will drop but not as fast.

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RE: Nitro models pusher Bobcat? - 3/3/2009 9:35 PM   
HeliTB



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Status: offline 		Crazy4Flight...I will take your word that you are correct and change the direction of my prop. It will be scary to see any performance gain as with the prop backwards I believe my Bobcat was pushing 100+ mph.


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RE: Nitro models pusher Bobcat? - 3/4/2009 3:44 PM   
HeliTB



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Status: offline 		Crazy4Flight...I checked my prop direction last night. If I face the 11x7p towards the prop nut it will be spinning backwards. The trailing edge of the prop would cutting into the wind if I put 11x7p towards the nut.

Again my prop is an APC pusher prop. I'm going to leave my prop the way it is with the 11x7p facing towards the plane/engine, because the leading edge of the prop is cutting the wind.


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RE: Nitro models pusher Bobcat? - 3/4/2009 7:56 PM   
BillS


 

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Status: offline 		I have six different APC pusher props. Most have the size towards the nut but the 11 x 7p has the size towards the engine.

Bill


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RE: Nitro models pusher Bobcat? - 3/5/2009 1:30 AM   
SU-31 flyer



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Status: offline 		I just got two new APC 11X7P for mine and the lettering will be toward the elevator. Just thought I would chime in here.


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RE: Nitro models pusher Bobcat? - 3/5/2009 2:11 AM   
Crazy4Flight



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Status: offline 		well looks like APC goes both ways, depends on the prop.

user must take care to install...watch the curve and camber of the prop...
A pusher prop wil makeabout 60% the thrust if installed bassackwards.
been there done that, and the bobcat flew just barely!

ok here are my props that were in the hangar. APC 10x6p 10x7p 10x8p
first pic F these are facing towards the nose
2nd pic R these are facing towards the tail.

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< Message edited by Crazy4Flight -- 3/5/2009 2:47 AM >

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RE: Nitro models pusher Bobcat? - 3/5/2009 5:30 AM   
HeliTB



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Status: offline 		Crazy4Flight...Please accept my apology. I have a 10x7p on my Bobcat with the C-2 towards the elevator and the writing 10x7p towards the motor. My 11x7p props will be as you stated C-2 and writing 11x7p towards elevator.

To all, Crazy4Flight was correct. My bad.


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RE: Nitro models pusher Bobcat? - 3/8/2009 7:22 AM   
BillS


 

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Status: offline 		For what it is worth the Tower .75 just purchased turns a 11 x 7p APC prop at 14,700 rpm. The engine probably needs more prop. Also the low speed seemed unusually fat after working with it until time ran out. Will work more with the low speed tomorrow.

Bill


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RE: Nitro models pusher Bobcat? - 3/11/2009 12:57 AM   
AGR413



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Status: offline 		I another thread in extreme speed prop planes essentially the same question was asked about the prop for the TH .75. As I posted there the best performance I have had was with the 12x6 zinger. But they break easy. I have put in an email request to APC to please make some 12x6 and 13x6 pusher props for these types of applications maybe if others joined in they would. Another suggestion was the graupner 11x8 which I may give a shot.

Here is what I sent APC:

quote:

Hi,



Please consider making some 12x6 and 13x6 pusher props for engines such as the Tower Hobbies .75. The only option I have found in this category is the zinger 12x6 pusher which gives great results but is too fragile. There are many pusher models that are popular these days and many modelers are using Tower and Os .75 engines. The prop of choice has been the APC 11x7 because of availability but it does not load the engine enough.



PS



This thread: http://www.rcuniverse.com/forum/m_4588799/anchors_4588799/mpage_1/key_/anchor/tm.htm#4588799



Applies to one of the planes I referred to and is a huge thread with a great deal of interest (147 pages long).


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RE: Nitro models pusher Bobcat? - 3/11/2009 7:33 PM   
BillS


 

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quote:

TH .75. As I posted there the best performance I have had was with the 12x6 zinger. But they break easy. … Another suggestion was the graupner 11x8 which I may give a shot.

I ordered a 11 x 8 Graupner pusher and should know how it loads the engine when it arrives.

Bill


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RE: Nitro models pusher Bobcat? - 3/12/2009 6:27 AM   
cyborg1


 

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Status: offline 		I believe that Opjose is getting very good results with the Graupner 11x8p. I've ordered them already, but haven't had time to test them with my OS 75ax yet. The APC 11x7 screams with the OS 75. I believe that you should be able to get about 13k with this combination.

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RE: Nitro models pusher Bobcat? - 3/12/2009 7:21 AM   
SinCityJets


 

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quote:

ORIGINAL: HeliTB

SinCityJets...I posted your link for the Bobcat/Falcon .25 turbine video in the other RC ???? website where we actually discuss the Bobcat .25 electric/nitro, well mostly electric. I thought the guys would like to see what Kolibiri is up to.

Are you offering any discount or financing options? :-) LOL


HTB,

I apologize for not responding sooner. I don't usually track this thread and didn't see your post.

Unfortunately, there isn't much mark up in these turbines. As you probably already know, they are pretty difficult to come by, and a second-hand market doesn't exist (at this time). These turbines seem to be like fine watches. once you have one, you just keep flying it. I have never been as impressed with a mechanical object as I have with these turbines.

What I can offer is outstanding support and quick delivery!!

Chad

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RE: Nitro models pusher Bobcat? - 3/16/2009 6:54 PM   
BillS


 

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Status: offline 		Wonder if there will be any more Bob Cat’s produced this year? If not I am looking for a yellow fuselage as a spare.

Bill


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RE: Nitro models pusher Bobcat? - 3/17/2009 4:29 AM   
N1EDM



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Status: offline 		Hello Chad,

I'm just catching up on this thread... just found it. Could you point me to the post about the Turbines, or a link to where I could check them out on the web? Are you talking about the full-sized Bobcat or the smaller Falcon/Bobcat 25?

Thanks.

Bob



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RE: Nitro models pusher Bobcat? - 3/17/2009 4:56 AM   
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Status: offline 		Is the factory that makes the bobcats even still in business?

Since I started making pulsejets for these ARFs (and the Long-EZ), all supply of them seems to have dried up so now I'm looking for new airframes.

I'm wondering if they might have been the product of one of the growing number of Chinese ARF-makers that have ceased trading in recent months.

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RE: Nitro models pusher Bobcat? - 3/17/2009 5:52 AM   
HeliTB



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Status: offline 		Go to RCG and type Falcon .25 turbine select forum and then go to last page


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