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Colinís Spanish Fury

The only one that actually did anything apart from looking pretty(!)

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Danny Fenton14/11/2018 18:00:55
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8840 forum posts
3699 photos

I have just double checked and my figures are for the 380 not 270, I blame it on old age

also tested the 350 and 380 KV

I know yours is a 320KV (Told you they did them all sorts of windings)

probably easier if I give all the numbers

5065 KV350
Prop Battery RPM V A W
15x10 8S1P 21 49 1000 520g
16x10 8S1P 7000 20.6 56 1197 520g
16x10 6S2P 18 43 795 960g
17x10 6S2P 5900 17.9 49 879 960g
18x10wood 6S2P 5600 17.3 51.5 914 960g
19x10 6S2P 5300 17 59 1015 960g
16x10x2 6S2P 5000 16.8 61.1 1061 960g
5065 KV270
Prop Battery RPM V A W Pack Weight
19 x 10 6S A123 4071 19.9/17.04 25.7 450 480g
19 x 10 5S 5k Lipo 4400 20.78/18.74 28.5 556 650g
20 x 10 7S 5k Lipo 26/24.6 46.2 1150
5065 KV380
Prop Battery RPM V A W Pack Weight
20 x 10 6S A123 4100 19.5/14.2 40.9 625 480g
20 x 10 5S 5k Lipo 4912 20.4/17.7 51 902 650g
20 x 10 7S A123 4921 22.7/16.57 51 894 560g
20 x 10 8S A123 5337 26/17.1 62.48 1232 640g
20 x 10 6S 2P A123 5000 19.8/17.2 55 998.9 960g
20 x 10 7S 2P A123 5400 22.93/19.68 63.5 1274 1120g
20 x 10 8S 2P A123 5602 26.2/20.92 68.98 1456 1280g

Cheers

Danny

McG 696914/11/2018 20:48:16
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2369 forum posts
974 photos

Hello Colin,

Nice progress all of a sudden. Super for you if you could stay clear of those exotic countries for a while now. wink

Regarding your u/c, if you allow me.

I'm maybe/very certainly not totally aware of your plans, but if you solidly fix the aft wire to your 'new' former (Fx?), you are creating a total solid 'triangulated' u/c with no 'aft' flexing and no 'compression' availability. The tyre rubber only will certainly not be able to absorb any energy.

As the Spanish legs are narrow at the bottom side, using an oleo strut would be easily possible with an hollow GF pant allowing the bottom part to 'slide' in a bit.

But then, I don't exactly know if apprentices are allowed a 2 euro 'pence'? blush

Cheers

Chris

Danny Fenton14/11/2018 21:38:41
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8840 forum posts
3699 photos

It is an interesting problem, and I would have to agree with Chris, two legs in a triangle is going to create a very rigid structure. with no rearwards flex at all. The U/C loads will be transferred to the airframe and landing wires.
I would use a single leg anchored to a thicker/upgraded existing former. it could then spring backwards and forwards as well as splay out as needed. The trick will be to ensure the widening shroud is flexible enough not to break off under the stress.

Where is Gordon when we need him wink 2

Cheers
Danny

Colin Leighfield14/11/2018 22:53:28
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5551 forum posts
2266 photos

Danny, thanks for the motor info, very helpful.

Chris and Danny, I agree absolutely with all of that. I would point out that the design on the plan has no give anyway, the load is fed straight back into the centre section with no springing and no springing on the front leg either. Dick van Mourik describes that he had no springing in his undercarriage and he was using 4” wheels.

I am going to stick with it. There will be a need to ensure adequate reinforcement where the bulkhead is secured, but apart from that the only springing will be lateral spread and that won’t be a lot. As long as it doesn’t rip out, the primary risk then is probably bending back of the wheel axles and twisting of the legs. I need to work on my landings, don’t I?

Colin Leighfield16/11/2018 14:17:51
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5551 forum posts
2266 photos

a8f91360-e848-4f0f-aa46-964609739892.jpegBlimey, what a lump! Arrived in 3 days from HK. I’m definitely sticking with the ply engine mount, there’s going to be a lot of twisting torque transmitted through this. 085adcef-5dc6-45c0-924a-54828a70d633.jpeg

Danny Fenton16/11/2018 14:33:10
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8840 forum posts
3699 photos

It says 5065 on it, but the proportions look different to mine? you had better check the length of that motor just to make sure it will fit? Mine is 71mm from the front of the prop mount to the rear of the motor body, not including the cruciform mount.

motor dims.jpg

Cheers

Danny

Danny Fenton16/11/2018 14:39:49
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8840 forum posts
3699 photos

The engine mount has always been ply Colin, it is F1 that some have substituted for balsa

Cheers

Danny

Colin Leighfield16/11/2018 16:05:40
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5551 forum posts
2266 photos

782aefdc-f16d-4333-a7ab-533212d3a4db.jpeg434ea3d1-99e8-4974-9c46-4a20e2d9548e.jpegLooks as if you are right.? I can solve it by cutting the fuselage sides though and fitting the engine mount further back? (Note balsa F1 lurking in the background).1a25a655-e288-4169-82fb-d8be12870d3e.jpeg

Jose L. G.16/11/2018 16:09:48
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171 forum posts
125 photos
Mine is 76 mm long !
Martin Fane16/11/2018 16:47:38
259 forum posts
262 photos

Hi Colin

What sort of weight do you expect from your build ?

Im guessing we are looking at 9 to 10lbs ?? so around a 1000Watts power ?

Looking at Dannys motor testing I wonder if the 320Kv motor is going to produce engough power (unless you use a 20 inch plus prop or go 6s Lipo ???)

As i cant seem to locate the higher kv Turnigy motor I was thinking of a 4max PO-5065-360.

Im a total electric beginner so may be talking total rubbish sad

cheers

Martin

Danny Fenton16/11/2018 17:09:32
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8840 forum posts
3699 photos

I think I must have made assumptions that all 5065 motors were a similar size, sorry about that chaps

I thought 50 was can diameter, and 65 was can length. (or vice versa) all of my 5065's are identical size and I swap them around between airframes depending on the KV I want.

That motor looks longer than 76mm Colin, I measured from where the prop would sit, to where the cruciform would mount.

If you change the position of the mount then you will lose the battery box......

IMO 100 Watts to the lb is not applicable to large props, they are more efficient, if you have over 900 Watts you will have plenty! And I will be using a 20" plus prop

Cheers

Danny

Martin Fane16/11/2018 17:16:16
259 forum posts
262 photos

Hi Danny

So you think the 320Kv motor on 5s with a 20 inch prop should produce 900 plus+ Watts and be OK ?

Just the dimensions to consider.

For info, the PO-5065-360 does seem to have the same dimensions you quote so maybe a rebadged Turnigy ??

cheers

Martin

Colin Leighfield16/11/2018 17:17:54
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5551 forum posts
2266 photos

Jose, mine is 76 also!

Martin, hadn’t really thought about it but I wouldn’t have expected it to be that heavy, I would have guessed more like 8. However looking at Dirk Van Mourik’s build article (with a Laser 120) he said 4,300 gms, 9 lbs with 10 ozs/260 gms of nose weight. However his maths seem odd to me because 4.3 kgs. is 9.5 lbs using the 2.2 lbs/kg that I understand. Having said all of that I can’t see the original flying with a Merco 61 at 10 lbs, I would have thought 8 was more like it. No doubt if Danny is watching he will comment on this, I will be surprised if he has got this wrong.

Colin Leighfield16/11/2018 17:20:11
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5551 forum posts
2266 photos

 I’ve only just noticed Danny’s reply and am concerned to read his comment about the battery box! In fact measuring from the prop driver face to the back of the motor where the cruciform sits, mine is 86mm! £50 with HK down the suff?

Edited By Colin Leighfield on 16/11/2018 17:23:31

Danny Fenton16/11/2018 17:30:00
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8840 forum posts
3699 photos

Martin the 320KV might not be enough, 900 Watts is where i would want to be with the model coming in at anything up to 10lbs. I really hope to be closer to 7 for mine, but I know my models do tend to come out light, it's the foam

You may have to think about upping the cell count by one.

If you can fit the longer motor then you are okay. The cells can go directly behind F1.

the aerodrive 5060 or even 5055 might be a better choice, if you can get a suitable KV, but I am unsure if the lengths will work. they are both much lighter than the "new" 5065 which is more motor than is needed

Colin Leighfield16/11/2018 17:53:18
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5551 forum posts
2266 photos

Measuring as Danny suggests mine is 86mm long and laying it on the plan confirms that I have to lose 15mm from the front. No problem to do that but I hadn’t even thought about it. I’m guessing that I will go for 5S 5000mah and get prop rpm somewhere about half way between 270 and 350. Better look at battery sizes and work out where they can go!

Martin Fane16/11/2018 18:49:23
259 forum posts
262 photos

Colin

From hobbyking PROPDRIVE v2 5060 380KV Brushless Outrunner Motor looks just right ?

Aavailable in the UK warehouse too.

Martin

Colin Leighfield16/11/2018 19:00:08
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5551 forum posts
2266 photos

Hi Martin. Just looked at it and it seems fine. I find it difficult to make a perfect decision on this, but I’m going to have a look later to see if there will be any battery issues (using 5S 5000 mah Lipo) and if that is ok will stick with what I’ve got. I will see where I might be able to use blue foam and keep an eye on the weight from now on.

Colin Leighfield16/11/2018 22:15:38
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5551 forum posts
2266 photos

Apart from sticking the fuselage sides together with F1, 3&4 I’ve haven’t been able to do any building tonight. However even with 15mm cut off the fuselage sides at the front I can’t see why there should be much difficulty in finding space for a 5S 5,000 mah Lipo, or am I missing something?

That is assuming that the combination of this motor, 5S 5000 battery and 20x10 prop are ok for this plane? That is where I am heading.

Danny Fenton16/11/2018 22:30:40
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8840 forum posts
3699 photos

Colin, bolt the motor to a work-mate, and strap a 5S to it a selection of props and cells should give you the info to make a good decision. If you need help give me a shout.
Cheers
Danny

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