SIMON CRAGG
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Posts posted by SIMON CRAGG
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Sorry to sabotage the thread, but seemed a good idea at the time!.
Anyway, pretty sure it is the Viceroy, thx everybody.
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I am in the process of fitting two 70mm 12 blade 4s EDF motors to a 65" high wing model.
The EDF's will be in nacelles under the wing with a neutral thrust line.
My question is, how far out from the fuz do the EDF's need to be fitted?
My thinking so far, is as close to the fuz as possible, so any minor mis match in thrust will not be as noticeable etc.
Anybody any ideas please?.
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While we are on the topic, anybody any idea what model this is please?
65" Wingspan, 51" Long.
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Agreed, I have been running high end lipos in my 90mm EDF jets for a few years.
Just interested in the current Lipo experiences of others for a low tech 70mm hack EDF.
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In the process of purchasing a couple of 6s 4000mah lipos for an EDF model.
Torn between Turnigy High Power, HRB or GNB.
What are the current thoughts chaps?
They all have plus and minus points!
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At last!....Really pleased for you Bonzo, great result.
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I re-installed the SKYRC data logger software, and its now working perfectly.
Having had a speed flea, this SKYRC is a much better product IMHO.
Picks up satellites in about 20 seconds, as opposed to 5 minutes in some cases for the SF.
Easy to read.
Individual flights can be recorded and downloaded to the PC, showing a detailed map, track of model and a wealth of other info.
We are holding an Easter comp. where the gizmo will be used by all competitors........should be fun!.
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After completing a few trial runs, the actual logger works a treat.
Average height, max height, average speed, top speed and distance all fine.
Compared to my cars speedo, more or less identical.
There is a downside though!
As far as I know, if the readings are recorded, the only way to clear them is via the software / computer.
I tried a few times to get the download to work, but it either froze / locked up the computer etc.
As I do not want to end up with frustrating hours trying to sort out my PC , I gave up. My system (windows 10) will not even let me completely remove it!.
However, all is not lost, as the logger can still be used perfectly well, but not in recording mode.
Not worth the aggro of trying to send it back to China etc.
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Brilliant as always Bonzo.
Oddly enough I have been doing similar thrust tests, using a digital set of fishing scales.
Hook of scales attached to tail of model, and other end to kitchen table leg.
Worked a treat!.
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I have just purchased one of these for use at club fun fly events.
Registers max speed, avg speed, avg height, max height and distance etc.
On the face of it, a good bit of kit and the results of an event can be loaded onto the computer with a suitable map.
Has anybody any experience of these, any gotchas etc?
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Thx John, useful tip for the future!
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I ended up using cellulose thinners which worked ok, I have decided to repaint the complete model camouflage colours, much easier than faffing about with the original colour scheme!. Something different up the field.
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Neddy, "Fishing bright light".....please can you point me in the right direction, as never heard of them!.
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17 hours ago, Erfolg said:
As Simon has written, IC props are heavier.
The consequence is that more power is used in turning the prop, than a lighter prop. Which does mean there is a reduction in revs for the same watts drawn. As W=2piTN re-arranged N=W/2piT, a fancy way of saying less thrust. Also The higher camber on most if not all ic props seems to also adversely affect the thrust, possibly a drag thing.
Does it matter, from experience and much to my surprise it does. IC props do not provide the same performance to an extent that is noticeable.
Like many returned modellers, I have quite a collection of IC props. I do have concerns about them. My own seem to have dried out (could be a storage issue), plus polymers are known to deteriorate with age, again is it so with our propellers. We know that UV damages polymers and fabrics, is it an issue with our props, they are generally not outside. The other thing with age is that the plasticisers often leach out. I have just had an issue with some plastic hinges, which were buried in an old model, the old spares were brittle, again much to my surprise and annoyance (Kavan, about 30 years old).
At the end of the day, I use electric props as they seem to work better than the equivalent new ic props. Plus all the ifs and buts are avoided.
Thats pretty much what I have experienced, thanks for a more technical explanation. I also used a digital set of fishing scales to measure thrust. One end attached to the model.......other to a table leg. Lots of interesting figures. Plus readings gleaned from my wot / what / watt / wat meter!.
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I have just purchased an Avanti S which has been stored for a couple of years in an attic.
The white foam sections are dull and grubby.
Before I start experimenting, can anybody recommend a product / method of restoring the finish please?.
Not expecting miracles, just something to make it look a bit better!
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Whatt meter = my bad!
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I'll let you know Geoff, not flown it yet due to the patch resembling a paddy field!.
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Oddly enough I have just fitted an old skool Wot 4 wing to my Thunderbob model, which flew like a brick with the foamboard wing.
After a bit of carving out, set it at 0/0.
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I personally would never use an IC prop on an electric motor, and sold all mine as a job lot many years ago.
They are heavier and the mounting boss is much wider.
I had one (balanced), vibrate so badly, it ripped the mount and cowl out of the model and destroyed the front.
I did several experiments, and found the e props much better all round, confirmed by the watt meter.
As an aside, I always use metal backed spinners, as the normal plastic items can also cause bad vibration even on an e prop!.
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Nine of these models were built as last years club model.
My set up was:
BIG FUN 4S 3300 LB 4.1 FMS 3948 - 760 13X5.5 60A ESC AEROSTAR 49A / 709W / 177 W PER LB
Foam / veneer wing version.
Hope that helps.
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I had similar faults and binned all of mine (6).
Way to complicated with the programme card(s), and a bit of messing about with disconnecting the red power feed.
Never really trusted them, and certainly not el cheepo.
Sywalker V2 for me these days.
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Its nothing like the original ad Frank!.
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I'm feeling a bit guilty about this, as it was me who initially found it on marketplace and made Frank aware.
Damn......hope he gets it sorted one way or the other.
Buyer beware and all that.
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8 hours ago, Frank Day said:
Looking for one of these.
If you see the facebook Marketplace one its a con, I know I bought it and was sent a box of rubbish ( £110 Frome Somerset )
Damn, what a nuisance.
Is it fixable?.
Watts/lb EDF vs Prop
in Electric Ducted Fan
Posted
Oddly enough I have just completed the same.
Middle Phase + Powerfun 70mm EDF.
Flew it a few times and sold it on.
I am now looking at the TOP RC Swift, which is a similar design, but carbon reinforced thin wing etc.
100mph +!