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Chilli Breeze from Sarik Plan, Electric Conversion.

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Stuart Quinn-Harvie 111/02/2019 15:56:13
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37 forum posts
15 photos

Afternoon folks.

The plan, wood and power system have arrived, and I will be cracking on with it very shortly, starting with the fuselage because that's where I always start, and I am a middle aged man and therefore fear change, And because an on line retailer provided me with trailing edge stock that curves like a boomerang, so I will have to replace it.

 

I am using a PROPDRIVE v2 3542 1000KV rated at 47 amps with a 60 amp speed controller and 4s 2200mah batteries. I haven't decided on the propeller yet but am thinking something like 12x5. As per Nigel R's recommendation the FWall will be placed about an inch further forward, and I think I will work out a bottom mounted hatch for the battery.

One thing that I am thinking about is changing the undercart to a trike - partly because I like the way they look and partly because I have an unreasonable fear of nosing over. ( I have no idea either )

Aileron servos will be fitted in each wing for simplicity and because I like nice short linkages.

 

That seems about it, so time to clear the board and assemble the SLEC fuselage jig before another banana takes shape in the workshop.  

 

 

Any suggestions, caveats or hoots of derisive laughter welcome.

 

 

Edited By Stuart Quinn-Harvie 1 on 11/02/2019 15:57:01

Edited By Stuart Quinn-Harvie 1 on 11/02/2019 15:57:39

Denis Watkins11/02/2019 16:06:48
3388 forum posts
151 photos

Maybe some snippets here Stuart **LINK**

Nigel R11/02/2019 16:27:16
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2325 forum posts
389 photos

You'll struggle to get it to nose over. It sits low. It is long. The wheels are quite forward. And are also set wide. Ground handling is excellent.

12x5 is (in my opinion) way too much diameter for 4S, and not enough pitch and I think you will find it draws a monster current from that 1000kv motor - I'd suggest 10x6 or 10x7 and go from there.

As a comparison, I just finished an RM Aerobat, which is somewhat sleek although not quite as much so as the Chilli, it is just shy of 3-1/2lb, has a 10x6 on a 3536-910kv motor with 4S 2200mAh lipo, my wattmeter shows 450W and I get an 8 minute flight.

Might be worth planning ahead for motor mounting & cowl arrangement.

My larger Chilli, uses a 2-1/2" spinner. This means the nose ring can be (and indeed has been) opened up enough to get the motor in through the front. Four small notches provide just enough space to get the screwdriver at the mounting screws. Not sure if that approach would still work on the smaller size - what is the spinner, 2"? Going to be tight!

Watching with interest.

Frank Skilbeck11/02/2019 16:52:37
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4251 forum posts
101 photos

Just ran the motor through ecalc with a 12x5 and 4s 2200 mah battery gives 730watts and 57 amps..............

An 11 x 5 drops it to 608 watts and 47 amps.

10 x 6, 540 watts and 40 amps

Nigel R11/02/2019 17:18:21
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2325 forum posts
389 photos

^ I have a 3536 - 1050kv which showed 550W on a 9x6 !

ecalc always seems to come out a little conservative when I try it. At least, compared to the "just charged" numbers.

Stuart Quinn-Harvie 111/02/2019 17:33:09
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37 forum posts
15 photos

Cheers folks: I will look into the prop issue a little more as I go on. some good looking suggestions there though ( I am still getting used to this new fangled electron-shunting) I will indeed have a planning session re the nose, and take note of what you say, Nigel re the undercart. I'll keep it simple

Stuart Quinn-Harvie 111/02/2019 17:33:10
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37 forum posts
15 photos

Cheers folks: I will look into the prop issue a little more as I go on. some good looking suggestions there though ( I am still getting used to this new fangled electron-shunting) I will indeed have a planning session re the nose, and take note of what you say, Nigel re the undercart. I'll keep it simple

Stuart Quinn-Harvie 117/02/2019 20:33:48
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37 forum posts
15 photos

A slightly delayed start due to life the universe and everything, but tonight I got the SLEC jig together ( one of those jobs I had been meaning to get around to ) cut the root and tip templates and sandwiched some balsa together. I've not used the sandwich method before so decided to start with that - having a set of wing ribs always cheers me up.

I've been playing with a plan built Cardinal as well ( I have always had a terrible habit of doing more than one project at a time ) and that is up to the installation and covering stage.

I'll put up spme pictures when I have something to show

Stuart Quinn-Harvie 120/02/2019 00:04:13
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37 forum posts
15 photos

I've actually started. I cut the ribs ( and decided I REALLY dislike the sandwich method - although alighning them all to the trailing edge may not have been the best ides - perhaps aligning them equally to the leading and trailing edges would be better. Either way it' done now but I am going to do it differently next time, just to be sure.

the plan calls for the TE and LE to be supported first, then the ribs, THEN the spars, but being an Olde Farte with some Fixed Ideas, I've decided to put the spars in first aligned to the TE then add the LE. I am not sure which way is better, but so far the wing is nice and true, so I am happy so far.

Having paid seventeen quid for the plan ( I think this is the first time I have built from a plan that wasn't free in a magazine, or from Outerzone, and only the third or fourth plan only build I have ever done) it felt odd chopping it up, but there we go, I suppose. Rather than covering it with cling film, I use double wide sticky tape and that keeps everything glue free and doesn't crumple or get in the way as much.

It's not the best build by a long way, but it's a start - and I am enjoying it.

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Nigel R20/02/2019 15:22:26
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2325 forum posts
389 photos

I can't stand the sandwich method either. All the edges come out at an angle and need dressing afterward, and I always ended up with lumps and flats shouldn't be there.

I like printed templates much better. They seem to take about the same amount of time to make a rib set. And it is more accurate when done.

Piers Bowlan20/02/2019 15:57:03
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1650 forum posts
41 photos

Agree Nigel yes.

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