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Old Sep 05, 2011, 02:17 PM
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Trust of MIDI FAN PRO with ARC-3665-1 on 6S

Hello

Someone tried the turbine MIDI FAN PRO with ARC-3665-1 on 6S - What is the real Trust ?
(i don't think that 3.6 kg is the reality !! - ( it's some data on the net)

MADISONMaster
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Old Sep 06, 2011, 05:11 AM View Post
flyedcowboy
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Old Sep 14, 2011, 07:02 AM
Tony Audsley Retired Locksmith
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What would be the best (easiest and slowest) pusher prop jet to build and fly using Depron and one of the plans found on here

Thanks guys

Lockey
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Old Sep 14, 2011, 08:43 AM
Watt Waster
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Easiest and Slowest Prop Jet and ...

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Originally Posted by Lockey View Post
What would be the best (easiest and slowest) pusher prop jet to build and fly using Depron and one of the plans found on here? Thanks guys Lockey
Dang, I don't think anyone has offered any advice about the easiest to build and the slowest flyer in Depron or any other foam board. If they had, I am sure that would turn into a contest with many opinions and options. Generally speaking, any well balanced prop jet design can be flown with a high angle of attack so slow it might seem to be floating in the same place and not moving forward at all. It would take some practice in a low wind environment, but people do it all the time. Some call it prop hanging, or hanging on the prop. The only requirement is plenty of thrust and a big enough battery to keep it up for more than three or four minutes at less than WOT. On the other hand, if you want a slow flyer that can float about in a low wind environment without learning to fly around at a high angle of attack (HAA), you are seeking a very thin foam park flyer (TFPF) with a high lift wing.

There are some designs of TFPF that are made of 2mm-3mm foam board that are little more than a foam shell using minimal weight motors, ESC, battery packs and such that are so lite you need almost still air to fly them properly. There are also carbon framed flyers with a very lite weight plastic skin (think food wrap plastic film) of the indoor type (think Vapor) that can float about at less than walking speed for at least six minutes on a single cell LiPo battery. Off hand I don't know of any models of this type that are prop in a slot jets, but I can see it would be possible, but it would also be very expensive due to the carbon fiber parts. What one could do is use paper striped Readi-Board from the Dollar Tree store and make any number of prop in a slot jets using very lite weight motors, ESC, and etc. for a very lite weight model and balance it very carefully to fly at a HAA when trimmed properly, but the thrust would need to be kept high and that would drain the battery faster than normal.

I have subscribed to a number of TFPF threads that are a tube fuselage with wedge cuts on the front and rear of the tube, which is a common paper scale model airplane construction method. The wedge cuts are glued edge-to-edge to produce a jet shaped fuselage with attached lite weight, thin foam wings. They could easily be made to scale, or near scale, but our interest is often called cartoon, fat, fattie, phat, phlat, and other nickname style flyers. Some use propellers in the front, some just inside the tube, and some are rear mounted. The inducted propeller designs fly very slow and could be made to fly even slower as a high wing trainer type since placing the propeller inside the tube tends to reduce the thrust produced by the motor and propeller combination. Some of that reduction in thrust can be overcome by not trimming the propeller very much, if at all, and ensuring the tube is carefully designed to not suffer from back pressure effects. After that it is all about the motor's ability to produce plenty of thrust without weighing all that much, or requiring a heavy ESC and battery pack. Same would be true of any prop in a slot flat foam flyer modeled after a jet.
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Old Oct 04, 2011, 04:26 PM
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Old Oct 05, 2011, 12:06 PM
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Question about propellers for these planes

First if I am posting in the wrong thread I am sorry. I recently built an RcFoamfighters FF15 and am using an APC 6x4EP prop but was told at the flying field I could use a standard prop with the lettering facing forward towards the nose of the plane. Is this a correct statement or must I only use Electric Pusher props on pusher planes? All my searchs only bring up the size of the prop ie: 7x4, 6x6 and so on noone states if it is a pusher or standard prop. Thanks
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Old Oct 05, 2011, 12:44 PM
Watt Waster
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Which Propeller Design Works Better?

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... I recently built an RcFoamfighters F15 and am using an APC 6x4EP prop but was told at the flying field I could use a standard prop with the lettering facing forward towards the nose of the plane. ... Thanks
Yes, you were told good information, which means you can use cheaper propellers. Since most of us are using brushless motors, mount the propeller according to the hub design. The thicker part of the hub needs to be against the motor's face to take advantage of the hub having a thicker end (if it does). To cause the propeller to push, rather than pull the air, plug the motor leads accordingly. If you don't already know this, how you connect the motor's three leads to the ESC leads will cause the motor to turn either clockwise, or the opposite. Nice little detail when you want the motor to push air rather than pull it.

It really makes no difference if the lettering and numbers molded into the propeller blade surface are directed rear-ward in a pusher mount. Some may insist the propeller must be mounted in a specific way or it will be weaker, but that only reveals the "expert" has no idea how propellers are made. When plastic is squirted into the mold under high pressure, it has no idea it needs a specific direction to be stronger than another. The blades have no clue which direction of travel is better either, but the hub thickness does indictate by thickness which end needs to be touching the face plate of the motor. Sometimes the cheaper propellers have a hub design that is the same and offer no advantage, or extra plastic on either end/face.
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Old Oct 05, 2011, 03:22 PM
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Quote:
Originally Posted by Tsavah View Post
Yes, you were told good information, which means you can use cheaper propellers. Since most of us are using brushless motors, mount the propeller according to the hub design. The thicker part of the hub needs to be against the motor's face to take advantage of the hub having a thicker end (if it does). To cause the propeller to push, rather than pull the air, plug the motor leads accordingly. If you don't already know this, how you connect the motor's three leads to the ESC leads will cause the motor to turn either clockwise, or the opposite. Nice little detail when you want the motor to push air rather than pull it.

It really makes no difference if the lettering and numbers molded into the propeller blade surface are directed rear-ward in a pusher mount. Some may insist the propeller must be mounted in a specific way or it will be weaker, but that only reveals the "expert" has no idea how propellers are made. When plastic is squirted into the mold under high pressure, it has no idea it needs a specific direction to be stronger than another. The blades have no clue which direction of travel is better either, but the hub thickness does indictate by thickness which end needs to be touching the face plate of the motor. Sometimes the cheaper propellers have a hub design that is the same and offer no advantage, or extra plastic on either end/face.
Thanks for the quick response. I will now be checking on a few different prop configurations for this bird. Thanks a million!
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Old Oct 05, 2011, 03:34 PM
hammer slammer
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I always thought that the proper design leading and trailing edges were different and had to spin the correct direction for full thrust?

Is this incorrect? I looked at a prop and seams to be different edge to edge.
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Old Oct 05, 2011, 05:50 PM
Pusher jets rule!
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If you are using the standard 2212-6 or 2826-6 2200kv motor, the APC 6X4E prop is the sweet spot for those motors. You can forego pusher props and just get the standard E prop. Put it on the motor with the numbers facing the front of the plane, and hook up the motor/ESC so that the motor is spinning in the proper direction.

Easy as pie!

Pat
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Old Oct 05, 2011, 05:59 PM
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Yes, basically it doesn't matter if the motor shaft is facing forward or backwards in your application, just have the prop numbers(front of prop) facing forward, and the motor running in the right direction and it will pull/push the airplane in the right direction

I will contend that mounting the propellor backwards, ie if the shaft of the motor is pointing to the rear, and you mount the numbers on the prop to the rear, that even if you have it rotating in the right direction for proper thrust, it is not as efficient and will not provide as much thrust as the prop facing forwards and rotating in the correct direction.

Frank
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Old Oct 06, 2011, 11:44 PM
Tony Audsley Retired Locksmith
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Can someone please tell me what or how is the prop being held in place on this pic from post 392

Also what is the ALL TIME favourite of all the pusher plans on here?

Thanks

Lockey

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Old Oct 07, 2011, 12:16 AM
Pusher jets rule!
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That's called a "prop saver", or "wobbly adapter", or "prop adapter". It's something like this:

http://www.nicohobbies.com/store/ind...roducts_id=191

Basically, the prop is held on to the adapter by an o-ring. So that when you land and if the prop is pointing down, it will bend and "give" without breaking. I use it on all my pusher jets.

As far as the favorite, hard to say. This is mine, but of course I'm biased.

http://www.nicohobbies.com/store/ind...roducts_id=180

Build thread for it: http://www.rcgroups.com/forums/showthread.php?t=795691

Pat
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Old Oct 07, 2011, 01:17 AM
Tony Audsley Retired Locksmith
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Thanks Pat, once again ... you are the man

Lockey

EDIT: PS. Pat, is that your web site?
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Last edited by Lockey; Oct 07, 2011 at 03:25 AM.
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Old Oct 07, 2011, 09:28 AM
Pusher jets rule!
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Why yes, yes it is. (which is why I said I'm biased )

Pat
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