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New EDF Mini Jets- Sabre & MiG15 RCM&E 2018 Special

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Glen Lewis28/11/2018 16:34:04
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10 forum posts
5 photos

I'm trying to upload a couple of pictures but can't seem to figure the system out unfortunately

ken anderson.28/11/2018 16:41:59
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8521 forum posts
773 photos

hello glen,i create a folder on my pc,put the pictures in there.then create a folder on the forum albums...example called "sabre".... upload the pics to that and save them. Then post your thread and select the option to post a photo,(the camera sign)go to your album(sabre) and click on which photo you want to include...….. hope that makes a little bit of sense?

ken anderson...ne...1.... bit of sense dept.

Glen Lewis29/11/2018 16:41:58
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10 forum posts
5 photos

img_4231.jpg

Thanks Ken, I would never have figured it out without your post!

ken anderson.29/11/2018 18:35:13
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8521 forum posts
773 photos

well done glen, your model looks spot on there...the canopy takes a bit fiddling to fit....kulou

ken anderson...ne...1...fiddling dept.

Ian Moody29/11/2018 18:55:29
78 forum posts
10 photos

Nice job Glen, I love an uncovered balsa modellaugh Now if you can just hack holes in it to let the air in that would be greatcrying

Glen Lewis30/11/2018 04:24:11
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10 forum posts
5 photos

Thanks, unfortunately I won’t be able to work on it for a couple of weeks while I’m out of town for work but shouldn’t take too much longer once I’m home

Nigel R30/11/2018 08:53:14
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3403 forum posts
524 photos

Gents, is there some way the canopy could be used to route air into the fan unit?

Seems like a small area could be cut away at the front of the canopy, and a big hole opened up in the cockpit "floor"?

ken anderson.30/11/2018 10:28:11
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8521 forum posts
773 photos

maybe T.Nijhuis will come on to this thread and give us some insight into his models....anyone know him...pass on the message...

 

ken anderson...ne...1...…. MSG dept.

Edited By ken anderson. on 30/11/2018 10:29:10

Nigel R30/11/2018 11:46:10
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3403 forum posts
524 photos

He's not been here for a couple of months Ken... hope he'll be back soon...

Steve Balaam02/12/2018 14:12:06
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115 forum posts

The TN Sabre is next on my building list. There has been a lot of discussion about getting sufficient air in to the fan,

I'm going to use Naca ducts on mine, what are the tell tale signs on the ground that the edf is not getting sufficient air and is being choked ?

Steven Shaw05/12/2018 14:44:33
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344 forum posts
187 photos
Posted by Steve Balaam on 02/12/2018 14:12:06:

The TN Sabre is next on my building list. There has been a lot of discussion about getting sufficient air in to the fan,

I'm going to use Naca ducts on mine, what are the tell tale signs on the ground that the edf is not getting sufficient air and is being choked ?

I picked up an "Aeroplane Illistrated" book on the F-86 and found apicture of a F-86C with NACA ducts.

It may make mounting the elevator servos a bit more fiddley.

f-86c inlet duct.jpg

f-86c.jpg

Edited By Steven Shaw on 05/12/2018 14:49:02

Erfolg05/12/2018 15:43:51
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11558 forum posts
1274 photos

Apparently it was a one off, given a temp designation of F86C before given a permanent designation of YF-93A. The standard cheat holes, that many models use, that is a louver arrangement underneath, just in-front of the fan seem to work well. I guess the louver arrangement is to minimise the risk of ingesting debris when landing.

There is potentially the option of doing a F100, or FY107A using pretty much the same wing and modified body. The only reason i have mentioned the YF 107A is that having a dorsal intake, making it bigger and being short could help the fan to breath without, the deviations being blindingly obvious. Plus the inlet is well away from ground damage.

Steven Shaw05/12/2018 16:39:43
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344 forum posts
187 photos

Yes - I've been looking into that also.  Just dont want to weaken the wing joint too much.

cheater hole.jpg

Edited By Steven Shaw on 05/12/2018 16:40:53

ken anderson.05/12/2018 16:53:48
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8521 forum posts
773 photos

here's a couple of photo's of mine,the nose and the view from above to show the radio gear in the floor of the cockpit.the model seems to have a fair size hole at the front,plus the large "slec" intakes on the side,in front of the fan...….

sabre31.jpg

sabre 30.jpg

ken anderson....ne..1.....Fan dept.

Erfolg05/12/2018 18:44:15
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11558 forum posts
1274 photos

Ken

It will be interesting to hear how it goes.

I quite agree that the intake is quite large. My only doubt and very real interest does all the gubbins in the duct make much difference, although the additional side intakes i guess will make up for any duct losses (that are material).

It is duct losses that could make a YF107a attractive, although again the duct shape will not be ideal. The Lipo etc. can be arranged to be in the front of the body. There is another downside in that the cross sectional area is greater due to the body being underneath.

I have been attracted to a Heinkel 162 just due to the ideal duct. But every time I look at drawing the body it seems enormous.

It is possibly the performance of the fan units that you guys use that will point the way for those of us watching.

Tony Nijhuis12/12/2018 20:28:41
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609 forum posts
233 photos

Evening Guys,

I don't often get on to the forum and even less so due to putting a stop to building and designing due to health reason......

Firstly Ken....14 amps draw from the FMS 50mm fan is low so there is something wrong......25-30amps or more should be expected according to the data sheets. Suggest the ESC maybe at fault....for info, i used a cheap 30amp quadcopter ESC with the AEO 50mm fans as it a simple switch on a go....no programming to screw you up.....current draw was around 25amps. Secondly, strangling or restricting the fan will not drop the current draw so it is nothing to do with restriction!!!!!

Regarding other comments concerning flying.. i think the photos speak for themselves taken by the editor... I'll say no more!!!....

What I will say and should be obvious is that if you put a more powerful fan in the model and keep the same air intake cheat hole you wont necessary get any more thrust. The fan will simply not be able to breath!!!. SO increase the cheat hole opening or you'll be wasting energy!!!!!.....A more powerful fan will need a larger battery....(possible a 2200) which will add to weight....QED more weight but no appreciable increase in thrust (if you don't increase the cheat holes).....results in poor performance.....It is a fine balance between AUW-and thrust ....

I have just bought some of these FMS 50mm fans so hope to try them out in the Concord soon, as they do look promising

394a5593.jpg

394a5716.jpg

Ian Moody13/12/2018 08:37:56
78 forum posts
10 photos

The photo's look great Tony and they are great that they are taken by the editor but I wouldn't mind a video of them flying so I can see how well they fly to give myself and others inspiration to persevere with ours. Thanks

ken anderson.13/12/2018 08:54:32
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8521 forum posts
773 photos

hello Tony,sorry to hear of your health problems, hope you are on the mend. You may have mi-read my many posts,the fan i'm using is the HK Dr madthrust(not the FMS unit)) 50mm edf,3s/4800kv/max 450g thrust,max amps 18.i've had a go with a brand new lipo and am now showing 16 amps/170 watts...the model appears to have plenty of static umph...so watch this space for feedback on the maiden...… take care tony.

ken anderson...ne...1...madthrust dept.

Wilco Wingco13/12/2018 12:07:45
210 forum posts
3 photos

How about a British jet??.

Ray Wood 413/12/2018 22:28:02
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142 forum posts
26 photos

Hi Tony,

Sorry to hear building on hold 😕 shame we are not doing the Savoy this year ! What happened to Red October ?

Regards Ray

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