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Member postings for Nigel R

Here is a list of all the postings Nigel R has made in our forums. Click on a thread name to jump to the thread.

Thread: Mid life crisis prevention required
30/01/2020 14:41:08

"I note that 4max suggest their 3547/960kv motor for 3s "

Got to be a typo. On 4 cells and an 11x6 or 12x5 that would make the right sort of setup for a five foot trainer.

Thread: Have I enough power?
30/01/2020 14:31:23

449.0Wp is the peak power used in the system as a whole, i.e. 449 watts.

27.55Ap is the peak current draw, in amps. That tallies perfectly with the 450W peak power on a 4 cell pack.

However neither of those match up to a 14x7 doing 8100rpm, which is very odd. The 14x7 at 8100 needs almost double the power your meter is showing. I would say 450W is roughly equal to a .25 two stroke.

Just checking - it was connected between lipo and ESC?

And, did you hold it at full throttle for very long?

Thread: Traditional build that can use my 3S 2200 batteries
30/01/2020 10:47:21

How about Bigga Bit - but scaled down to 33"?

I'm making one now (well, the 42" full size) - it could not be simpler or quicker.

As everything (well, ok, barring the fin outline and rib shape) is a straight line, it is simple to lay out what little plan is required, from a few key measurements.

30/01/2020 09:50:07

Alley Cat

Mini Hog (mini Astro Hog)

Thread: Dynam Hurricane
29/01/2020 09:13:48

"just a short rough runway"

if you are going to be there for the foreseeable, is it worth putting a bit of time into improving the strip?

Thread: Have I enough power?
28/01/2020 14:49:11

**LINK**

4-max carry them

as far as I can tell, most of the <£30 units look to be very very similar in terms of buttons / display / etc.

Edited By Nigel R on 28/01/2020 14:50:23

28/01/2020 14:46:24

I make that about 10lbs in weight. Is it possible to relocate the lipo and loose all that lead?

The model's page quotes a 4S 5000mah and at the listed weight of 3.5kg that would make a lot of sense.

The IC engine range would suggest (max of .60 two stroke or .90 four stroke) shooting for about 1000W on the wattmeter.

1500W will be 3d capable, or, not entirely scale.

 

Using the rather useful prop power calculator shows your prop (14x7, 8100rpm) requires 750W of power at the prop; allowing for efficiency losses that would probably work out around 850W for the system as a whole.

I would guess 14x8, or 15x6, would set things right in terms of power output, but you absolutely do need a wattmeter to tell for sure.

Edited By Nigel R on 28/01/2020 14:51:04

Thread: Mid life crisis prevention required
28/01/2020 10:33:42

"The Pronto looks like an ugly simplified version of the Tyro Major to me!"

It is exactly that, kc. Same size wing, same size taiplane, same size (give or take) fin and rudder.

See also, RM Trainer plan for another DB design with the same wing and tail set as Tyro Major.

I would contest the point about a Tyro Major being "not much more work" over a Pronto, I reckon for a novice it would be a lot more work. Pronto fuselage is all sheet, all straight lines. Tyro has lots of built up stuff, sectioned tailplane, awkward rudder attachment, etc etc. Pronto was described in the build article as "the quickest way to build a trainer", which I believe.

The RM Trainer above is a halfway house between the two.

DB Mascot is another variation on the above.

I'd still recommend Pronto if our man is dead set on building it himself - I can't think of a quicker or simpler way to plan build a trainer.

Don's advice is spot on - don't fall in love with the trainer, it is a tool to do a job.

Edited By Nigel R on 28/01/2020 10:35:05

Thread: Most flown model
28/01/2020 10:27:37

BiFly 25

It is about 20 years old. I have no idea how many flights that has had - I'm the fourth owner. I've put a hundred flights on it. Good compact airframe, small enough to travel in one piece, large enough to be a "proper" plane.

20190103_120459.jpg

Thread: Mid life crisis prevention required
27/01/2020 16:06:20

**LINK**

DB Pronto, no question, easiest 3 chan RC balsa build going. Plan shows lots of dimensions - draw it straight on the wood. No awkward curves to cut out, apart from the wing rib template.

Perfect trainer characteristics when built.

Electric conversion - no problem, purchase some 25mm M3 standoffs and attach motor to firewall using standoffs. 3s3000 size lipo goes in the tank bay. ESC mounted between the standoffs right behind motor. 3536/1000kv motor, 9x6 prop, 30A esc, 3S 3000mAh lipos.

 

Edited By Nigel R on 27/01/2020 16:08:45

Thread: Hi boy electric conversion
27/01/2020 14:02:45

Hi David

I think the 3536 are right on their limit around 400w. For 500W or more I would go with a slightly larger motor (3548/900kv) together with 4S 5000mAh lipo as a "40 equivalent" myself. An 11x6 on that comes in around 500W, just as per kc's suggestion.

Thread: Dereck Woodward Bigga Bit
25/01/2020 10:25:38

Ready for covering.

Controls all bevelled, small block fairing added to wing root on the fuselage, tips completed.

Usually I'd slot the hinges before covering but I'm using CA hinges on this one so that will come after covering.

Same with the rudder pushrod, usually I'd want it in place before this point, but the fuselage is so short it can go in after covering, access is no problem.

All in weight including lipo, so far, is 2lb3oz. I expect covering to bring that up another 3oz or so.

25/01/2020 10:21:24

20200125_101039.jpg

24/01/2020 18:54:24

I think the foamboard is ok when it is, like the ribs, internal, and edged with timber. I'm not so convinced for control surfaces. It's just not stable, the paper covering is like a sponge and when it gets wet it shrinks. It'll probably be ok under some heat shrink.

But.

Balsa is better

24/01/2020 17:02:34

I shall add another triangulation in there before long.

Meanwhile the foamboard elevons have warped quite badly. I'm thinking of making some wood replacements. All I have in the scrap box that would do is some 1/16 sheet so I would need to make a framework and then add the 1/16 either side. Maybe I'll see if I can get the foamboard things flat using the covering fiat though.

24/01/2020 17:00:03

More bits of scrap wood stuck together and cut down. Pushed the boat out and added a proper catch.

Next job was to get the tips attached.

20200124_160601.jpg

24/01/2020 16:58:54

Which is another bit of 1/32 ply pretending to be a biscuit joint. Should be secure enough now.

I also made the hatch

20200124_151232.jpg

24/01/2020 16:57:46

Buried in there is a length of hard 1/8 balsa for the lipo. It's almost on the floor of the fuselage. I kind of snookered myself with the attachment at the front add it was very difficult to get a good joint between lipo tray and fuselage floor. So underneath I did:

20200124_151304.jpg

24/01/2020 16:55:36

20200124_151251.jpg

Thread: engine refurb
24/01/2020 08:54:16

You buy stove glass cleaner?

Newspaper, make wet, pick up some ash on it - removes crud from the glass almost instantly.

As per Don's post, I've used washing powder in an old saucepan before - seems to work ok.

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