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Member postings for eflightray

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

Thread: full-size electric-powered flying anyone?
12/01/2019 18:20:15

Just build your own ----

He's also an aeromodeller on RCGroups.
.
Thread: Famous model flyers
10/01/2019 13:12:15

I met Howard Boys a few times many many years ago, (1950's -1960's). He was a member of our the local Rugby MESAS club. Rugby Model Engineers Society Aero Section.

He occasionally flew some of his single channel RC models at Brownsover, Rugby, and also at Church Lawford aerodrome.

There is a tribute to him on the 'antiquemodelaircraft' site.

Ray.

Thread: Spitfire light
02/01/2019 13:07:06

Built up foam wings, (and fuselage, tail etc), for a Spitfire ?

Ray.

spitfire1.jpg

spitfire22.jpg

With retracts, flaps, and electric power, 7Lbs - 2oz flying. wink

Ray.

Thread: Laser cutting Depron
27/12/2018 19:25:51

What's wrong with a knife, (or as Crocodile Dundee put it, "Knife ?, that's not a knife, THAT's a knife).

Ray.

sbd1.jpg

sbd11.jpg

sbd25.jpg

All hand cut Depron, plus a little balsa.

.

Thread: Gatwick drone incident
27/12/2018 14:27:21
Posted by John Tee on 27/12/2018 13:50:17:

Gatwick has been owned for some years by the Spanish, Thev'e sold 50 .1 % to the French. What price Brexit

John

Who cares what price, ....

as long as there are a least 2 eggs, 2 sausages, bacon, beans, tomatoes, and naturally some black pudding ......

Damn, just dribbled on my keyboard.

.

25/12/2018 19:54:52
Posted by Don Fry on 25/12/2018 17:22:19:

Don't you lot ever call me cynical again. Funny enough, we drank a Chardonnay with the goose.

Watch out for a visit from the RSPB, getting a goose drunk as well on Chardonnay is probably one of their do-not rules.

wink

24/12/2018 16:29:01

I remember many years ago when we used to fly at disused airfields, we would often see drones hovering in the sky,

occasionally one would dive down to catch a mouse or small creature.

But I suppose they could have been Kestrels, or other birds of prey. They also seem to like flying and hovering over airfields.

Just shows that not all people see the same thing.

Is it a bird, is it a plane, is it ......

.

22/12/2018 13:57:14

Is there an 'official definition of a 'drone' ? (Preferable not one just made up to suit forums).

People seem to just be lumping any multi-rotor model in to that category, yet there are fixed wing model that can basically do the same job.

I'm sure the Army doesn't say, "No, it's not a drone we use, it's a fixed wing model plane".

?

Thread: IC and Electric
21/12/2018 15:16:41
Posted by Rocker on 21/12/2018 15:05:25:

The one thing I am finding between IC and Electric ,is every time I buy a new electric model I always seem to have the wrong batteries for it where has I.C one fuel does all !!!!

No, you are buying the wrong plane for the batteries, (electric fuel), you already have. wink

19/12/2018 20:25:50
Posted by Jon - Laser Engines on 19/12/2018 14:04:21:

Power...ah yes, that all inclusive word

............... <snip> ......

To give a few examples from my own models that are total opposites but gave the same result:

saito 45 in Nieuport biplane. I wanted better takeoff/cIimb performance so went went up from 13x5 @ 8500rpm to 15x5 @ 6500rpm. This lost me about .2 of theoretical maximum engine power, but the model felt as though it had more power, especially at low throttle, due to the higher efficiency and thrust of the larger prop.

The other was my Sea Fury. This was a little slow in a straight line and lacked vertical performance. I went from 22x8 @ 6800 to 21x8 @ 7400. This was a deliberate move on my part to bring the engine RPM up to get more power from the engine, and it worked nicely with the greater RPM allowing more vertical performance and greater top speed.

A friend also went from a 9000rpm 16x6 to an 8400rpm 16x8 and felt the model had considerably more 'power' even though maximum theoretical HP had dropped.

But then if you look at prop 'pitch speed' for the prop changes, you see why there is a difference in flight characteristics.

.

Thread: cutting foam
19/12/2018 13:56:42

Here's a tip.

Use your hot wire cutter to slice off thin sheets from the foam block ..... and then .......

build foam wings wink

lanc (12).jpg

sbd11.jpg

Or just buy Depron.

Ray. smiley

Thread: Glue for foamy?
17/12/2018 20:43:25

The important part is, UHU Por is safe and doesn't melt foam, many other adhesives can, though it can also obviously depend on what foam material.

Another alternative is a hot glue gun, though preferably one with a lower heat setting as too hot also melts foam.

.

Thread: Can a drone fly at 10000ft?
15/12/2018 20:55:50

Fantastic eyesight pilots have. Even recognising types, colour, and manufacturer.

Wow.

.

15/12/2018 20:17:32

It would be interesting to know what pilots can actually describe when they say they saw a 'drone'.

Many people will probably instantly think and imagine a quadcopter (multi-copter) type vehicle.

Back in the 50's, 60's it would have probably been called a 'UFO', but I imagine that pilots do not report a 'UFO' any more, just in case they get sent for psychological evaluation, and it goes on their record.

Not saying it wasn't a 'drone' that these pilot see and report, but it does seem to be 'the thing to report' if something is seen that seems 'different' from a bird.

Same as a 'UFO' instantly seems to relate to a flying saucer, space ship, etc.

Same a my B-25 being called a Lancaster, because it has twin fins.

It's often a guess, and the imagination that enhances the partial image.

It will be interesting when some facts appear, (if you can actually trust 'facts' wink ).

.

Thread: What can I fly on a 2S battery?
07/12/2018 21:00:58

If you have a surfeit of 2s Lipos, you could always connect them in series to get, -- 4s, 6s, 8s etc

All my 6s models use 2x 3s packs.

.

Thread: which is cheaper,IC or ELECTRIC?
06/12/2018 15:35:18
..........................................

Can you tell us how much the motors, ESCs, motor mounts and batteries in those two planes cost so that we can compare?

Not easily as the Dauntless was built 10 years ago, the Spitfire 6 years ago, (and both are still flying).

Dauntless - Emax 4020 - 520kv motor, Zippy 4000mAh 40C 3s battery x1 (current battery, have used others)

Spitfire - Emax 4030 - 385kv motor, Zippy, as above, 3s x2 (6s power).

Most electric motor come complete with a mount, ('X' mount), and prop driver.

The Zippy batteries, I have 6 3s packs, (plus some older ones still usable).

I would add that cost is probably not that easily compared, I have no clue how much the electricity cost charging them.

Ray.

Edited By eflightray on 06/12/2018 15:37:46

06/12/2018 15:05:30

To throw in another odd-ball,. What IC engine would be needed to turn a 17" x 8" prop ?

I fly a scratch built Douglas SBD Dauntless using a 17" x 8" prop, on 3s at 340 watts. It's 67.5" span and flying weight is 4 Lbs - 12.5 oz, and that includes retracts.

It flies quite scale like, obviously not a pylon racer.

For scale model, an electric motor can swing a much bigger prop for its weight, plus if you want to you can build quite light for electric.

I built the TN 70" Spitfire, (free plan in RCME Autom Special 2010, mine actually ended up at 72" span). But I used Depron and a small amount of balsa. Still used the TN molded exhaust stacks, lower cowl and cockpit. The plans quote a expected flying weight of 15 Lbs for the original build and IC engine power. Mine is 7 Lb 2 oz flying, on 6s, turning a 15" x 8", (originally a 16" x 10" but still flies as well on less amps).

I'm not arguing whether IC or electric is cheaper or better, but that it's just different, if you want it to be.

Ray.

30/11/2018 19:08:09
Posted by Don Fry on 30/11/2018 17:29:55:
Posted by Ron Gray on 30/11/2018 11:10:58:

Well the same would apply to edf for smaller jets.

But isn't this getting away from the question in the OP and, as predicted, degenerating into a 'what's better, IC or electric' discussion?

Not degenerating, merely diverging.

The original question was which is cheaper.

But this sort of question often turns into which is better. The same usually happens between using balsa or foam.

The only 'better' is in people's minds.

.

29/11/2018 13:25:10

The sound of an IC engine is often what make a scale model that bit more interesting, especially if it's the 'right' sound.

Admittedly not a very good example, there are better sound systems.

But then different people also like listening to different music, it's all a personal taste.
Ray.
28/11/2018 20:19:50

IC fliers often still need the help of electric power, ...... to start their engines for them. smiley

I was always a 'flicker', back in the day.

.

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