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HelicopterMain Discussion › MD520 NOTAR
11-16-2015 04:51 PM  24 months agoPost 1
DFC

rrNovice

Colchester UK

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I've been experimenting with NOTAR using TREX 500 mechanics, an Align Hughes 500 fuselage (modified with plug in booms), a 5-blade head, a 50mm EDF, all running on a 4s battery. Has been written up in one heli mag. Have just joined runryder and notice lack of activity on the topic for quite a while. Many examples shown won't be using the Coanda element of NOTAR but has anybody out there actually got the Coanda bit to work properly? I think I have but would be interested to discuss with others. DFC

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11-16-2015 11:16 PM  24 months agoPost 2
Phoenix NOTAR

rrApprentice

State College, PA​USA

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500mm EDF???
Seems a bit big for a 500 T-Rex.

Sandy

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11-16-2015 11:33 PM  24 months agoPost 3
jschenck

rrProfessor

La Vista, NE.

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sounds like a nice project, sure would like to see some pictures!

Did you go to the scale section of runryder?
Lots of activity but may not be too much with NOTAR since that sounds complex

Sure would like to see it though. Nice though of using a Trex-500 is the expense side would be lower, especially with the 50mm tail EDF

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11-16-2015 11:51 PM  24 months agoPost 4
Pistol Pete

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Seffner, FL

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Welcome to RR. I would also like to see photos and or a link.

Thanks for sharing.

~~Enjoying the hobby one flight at a time~~

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11-17-2015 01:59 PM  24 months agoPost 5
DFC

rrNovice

Colchester UK

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Have posted some pics in my Gallery. The conversion allows for the use of plug-in booms and many of the pics are of the Mk1 version. All the booms are made entirely from 0.5mm ply glued using 5min epoxy and I've now got to Mk4 (which has no Coanda slots) and Mk6 (which has my final design of Coanda slots). It's the Mk4 shown in bare ply and later finished. Apart from the sidewards facing rear nozzle there are vertical ports (up and down) to keep the air flow through the EDF constant and to balance the normal up-thrust component from the main nozzle. This works extremely well. The Mk6 has Coanda slots based on the results of the experiments with Mk3 shown. Both Mk4 & Mk6 have steerable tail fins which can be connected either to the SAS rudder output or the RX rudder output. I think the real MD520 has one fin connected to each. Hope that helps.
Also a video of early hovering demonstration at local club meeting is at http://www.youtube.com/watch?V=IgK23VIAHCM

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11-18-2015 05:05 AM  24 months agoPost 6
Pistol Pete

rrProfessor

Seffner, FL

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Thanks...getting an invalid video ID error.

~~Enjoying the hobby one flight at a time~~

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11-18-2015 05:37 PM  24 months agoPost 7
elmobad

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chicago IL

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Saw the video that's excellent

GOT FBL?

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11-19-2015 01:55 PM  24 months agoPost 8
Pistol Pete

rrProfessor

Seffner, FL

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Saw the video. Nice.

Any photos of the build?

Mainly interested in how you made the direct jet thruster turn.

~~Enjoying the hobby one flight at a time~~

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11-19-2015 02:07 PM  24 months agoPost 9
jschenck

rrProfessor

La Vista, NE.

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There appears to be an issue with the video link -
Here it is embeded in this discussion thread:

Watch at YouTube

and some photo's from Don's gallery:

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11-19-2015 03:30 PM  24 months agoPost 10
old nitroman

rrVeteran

Naples florida

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Very cool, nice job

E5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx

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11-19-2015 04:07 PM  24 months agoPost 11
eric_b

rrKey Veteran

Denver, CO, USA

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Really interesting, congrats it looks fantastic and impressive in flight!

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11-19-2015 05:08 PM  24 months agoPost 12
Dee Flies 3D

rrApprentice

Farmington Hls, Mich​- USA

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Wasn't there a VARIO fuse- bak in the late 80's/90's for a NOTAR? I thought there were some flying back then in Europe / Germany??

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11-20-2015 06:11 PM  24 months agoPost 13
jschenck

rrProfessor

La Vista, NE.

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07-05-2016 08:45 PM  16 months agoPost 14
DFC

rrNovice

Colchester UK

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MD520 NOTAR UPDATE

My thanks to everyone for their interest in this topic. It seems that at the present time I am more or less on my own in the use of Coanda slots although a recent edition of Radio Control Model World (UK)(RCMW)suggested there might be a VARIO development.

I have since made progress with my own experiments using an EDF to power the tail boom and have summarised things in three pdf documents which can be found in my gallery.

As a result I now have a 500 size MD520N heli with a working Coanda slot system which contributes 60% of the moment needed to hold the tail boom steady with the control nozzle at the rear providing the remaining 40%. The model uses a single 4 cell LiPo to power the main motor, the EDF, and the RX & servos. It has a five-blade main rotor and a 50mm EDF.

Crucial to the success of this project has been the use of:
1) wide Coanda slots to ensure adequate air flow through the EDF at all times to avoid EDF stall;
2) an improved Coanda slot design;
3) a one-piece tail boom design to minimise aerodynamic losses in the boom;
4) a more powerful EDF (now in hybrid form for reliability) to improve tail authority.

A second model has also been developed without Coanda slots and where the control nozzle at the rear incorporates dump valves to avoid EDF stall and counter the up-thrust generated by the control nozzle.

Copy describing my experiments is with RCMW and hopefully will appear soon.

Am very keen to hear from anyone else out there currently flying NOTAR with Coanda slots.

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07-05-2016 09:13 PM  16 months agoPost 15
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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somebodies got a pair, using a multi blade head to experiment with a tail system..

You could incorporate a bypass door for the air flow

spending time, paying attention

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07-17-2016 01:08 PM  16 months agoPost 16
Pistol Pete

rrProfessor

Seffner, FL

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You need to move to Florida. Thanks for update.

~~Enjoying the hobby one flight at a time~~

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07-24-2016 09:10 AM  16 months agoPost 17
IYKIST

rrKey Veteran

London united​kingdom

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Very nicely done, your system looks similar to one that Jim Morley (Morley helicopters) did, he converted one of his helicopters, he used the tail drive to drive the ducted fan and if i remember clearly the tail control was
like 2 sliding doors of the sides of the tail boom that was controlled by a push pull servo setup as one side opens the other closes.

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