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Sharkface question

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David Still 130/09/2019 21:23:15
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52 forum posts
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I have just completed a sharkface electric powered 1200kv motor on 3s lipo my AUW is 15.4oz which seems very heavy any thoughts?

Dave

Denis Watkins30/09/2019 21:37:19
4523 forum posts
121 photos

Is it 22" span? Dave

As the one here is 11oz on 2S 850mah lipo

John Lee30/09/2019 21:39:47
763 forum posts
86 photos

Well that's 50% heavier than mine! My latest (I've built 3 over the years going right back to the original single channel in the 60's) comes in at 300grams (10.5oz) with an Axi 2208/34 & 450mah 3s battery. It's double covered in mylar film then tissue & dope so I don't know how yours came out so heavy.

Edited By John Lee on 30/09/2019 21:40:38

David Still 130/09/2019 22:02:25
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52 forum posts
16 photos

Yeah 23" span I've no idea where the weight came from I'm not sure it'll fly at that.

Dave

Phil Green01/10/2019 00:09:06
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1609 forum posts
341 photos

206.5 grammes ready to fly including 800mAH battery, thats 7.2oz in real money:

206p5grammes.jpg

 

The blue & yellow one in the avatar is just over 8oz, both are film covered.

Cheers
Phil

 

 

 

 

Edited By Phil Green on 01/10/2019 00:17:38

brokenenglish01/10/2019 09:02:18
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580 forum posts
30 photos

Sharkface was revisited, and the plan reissued, in Radio Modeller, February 1989.
Gordon Counsell, the builder/reviewer didn't have the ultra-light gear that we have today. His version weighed 14.5 oz and flew very well, powered by a Frog 100 diesel.

The 1989 reissued plan is clearly marked, "Recommended flying weight 15oz.", although I think that should probably be taken as "recommended maximum".
Anyway, Sharkfaces weighing 14/15 oz. are not rare, so you'll be OK! It's a fast flyer at any weight!

The ultra light examples mentioned are probably all electric (not for me). I have one half-built that will be powered by a PAW 80 or 100 (same dimensions and weight).

Edited By brokenenglish on 01/10/2019 09:04:41

Edited By brokenenglish on 01/10/2019 09:09:59

David Still 101/10/2019 09:43:13
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52 forum posts
16 photos
Posted by brokenenglish on 01/10/2019 09:02:18:

Sharkface was revisited, and the plan reissued, in Radio Modeller, February 1989.
Gordon Counsell, the builder/reviewer didn't have the ultra-light gear that we have today. His version weighed 14.5 oz and flew very well, powered by a Frog 100 diesel.

The 1989 reissued plan is clearly marked, "Recommended flying weight 15oz.", although I think that should probably be taken as "recommended maximum".
Anyway, Sharkfaces weighing 14/15 oz. are not rare, so you'll be OK! It's a fast flyer at any weight!

The ultra light examples mentioned are probably all electric (not for me). I have one half-built that will be powered by a PAW 80 or 100 (same dimensions and weight).

Edited By brokenenglish on 01/10/2019 09:04:41

Edited By brokenenglish on 01/10/2019 09:09:59

Thanks that's interesting to know I might try it when the weather perks up, I have a 6x4.5 on it but might try more pitch if it needs a little more if not I'll hang it in the garage and build something else.

Dave

FlyinBrian01/10/2019 13:25:13
643 forum posts
4 photos
Posted by David Still 1 on 30/09/2019 21:23:15:

I have just completed a sharkface electric powered 1200kv motor on 3s lipo my AUW is 15.4oz which seems very heavy any thoughts?

 

Dave

Mine weighs about the same after several repairs, with three servos and a 1000 mah 3 cell lipo and it  flys fine

Edited By FlyinBrian on 01/10/2019 13:26:58

David Still 101/10/2019 17:16:11
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52 forum posts
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Posted by FlyinBrian on 01/10/2019 13:25:13:
Posted by David Still 1 on 30/09/2019 21:23:15:

I have just completed a sharkface electric powered 1200kv motor on 3s lipo my AUW is 15.4oz which seems very heavy any thoughts?

Cheers that's good to know I could save an oz if I put a smaller battery in but I'll try with what I have first. What size prop are you using?

Dave

Dave

Mine weighs about the same after several repairs, with three servos and a 1000 mah 3 cell lipo and it flys fine

Edited By FlyinBrian on 01/10/2019 13:26:58

Martin McIntosh01/10/2019 21:03:41
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3471 forum posts
1216 photos

I have a leccy powered one now with two alternative wings, one for rudder/elevator and the other with a slightly flattened out wing with ailerons. Don`t know the weight but they go like stink. I built the original when it was published. It used a Cox TD049 and a UK valve/transistor Rx minus its case and modified to be relayless thus allowing me to use a tiny 22.5V HT battery plus 1x and 2x AAAs so it must have been quite heavy by today`s standards! Sheer fun.

David Still 102/10/2019 19:43:03
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52 forum posts
16 photos

Ok I managed to get to the flying field today and did a couple of test throws and got a glide so tried some power but all that downthrust just pulled her to the ground so a second attempt full power throw and the same result but a broken prop curtailed any further attempts any ideas what I'm doing wrong here?

Prop 6x4 1200kv 160w motor on 3s.

Dave

brokenenglish02/10/2019 20:01:15
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580 forum posts
30 photos

David, they need to be launched with the thrust line level!!!
i.e. about 10° nose up if you've built as per plan!

Think about it. At the instant the plane leaves your hand, there are no aerodynamic forces except for thrust and weight (no lift). If you don't launch nose up, the downthrust will pull the plane down to the ground before you have enough airspeed to generate lift... A firm throw with the thrust line horizontal should cure your problem.

Former Member02/10/2019 20:15:56

[This posting has been removed]

Phil Green02/10/2019 20:55:17
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1609 forum posts
341 photos

Your aim should be to launch it at flying speed, a gentle toss is no good !

Ours are all rudder-only, sometimes we have to pulse the rudder to 'get it up on its elbows' as Dave Hughes once said

 

Edited By Phil Green on 02/10/2019 20:55:48

Peter Christy02/10/2019 20:55:36
1829 forum posts

Have you got elevators on it? If not, and its sinking after the launch, a quick wiggle on the rudder will lift the nose!

I used to fly mine with an Elmic Compact (compound) escapement and a Babe Bee .049. Just giving a quick-blip on the button after the launch was enough to lift the nose on a calm day. On a windy day - which they were designed for - this isn't necessary!

I really ought to build another......

--

Pete

David Still 102/10/2019 21:55:10
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52 forum posts
16 photos

Ok thanks I'll have another go when the next weather window hits. I'm used to hand launching level I've never had anything with this much downthrust so launching nose up makes sense.

Dave

Barry W08/12/2019 15:27:44
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80 forum posts
8 photos

HI , I have built a Sharkface with Electric Outrunner motor and rudder /elevator/throttle control.

The model weighs 14 .5 ounces ready to fly.

The question I have is what it the recommended power in Watts and prop size for an average flying Sharkface?

The motor I have is a Cheetah A2212-15, 930RPM/V, max current 12A Max Amps, 133W for 60 seconds

The motor weight is 47g/1.65oz.

The recommended prop size is APC8*4E 72Watts or 9*4.5E 108Watts. These values are with a 3S battery.

I would appreciate advice from anyone with experience with an electric powered Sharkface

Barry

 

 

 

 

 

Edited By Barry W on 08/12/2019 15:29:32

GeeW08/12/2019 18:43:13
119 forum posts
9 photos
2 articles

Barry

My S-face flies on either 8x4 or 7x5 on about 60 Watts. Yours will certainly fly . Keep rudder throw very small. Give it a good throw as mentioned above. Enjoy....best value model I have ever built.

martin collins 108/12/2019 21:46:40
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429 forum posts
199 photos

I`ve got a couple of part built Sharkfaces going cheap if anyone is interested!

Barry W08/12/2019 22:42:33
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80 forum posts
8 photos

Thanks GeeW, that's just the information I was looking for..

They don't have many Sharkfaces over here in "The Land of the brave and home of the free".

The folks in the local RC club think I am a crazy Brit as they seem to mostly fly "out of the box" foam planes.

I know Eric Cluton is also in the US but is quite a drive up to Georgia from central Florida..

Also he is a die=hard diesel man so probably has no experience with electric.

Barry

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