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Old Jan 20, 2015, 06:12 PM
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Australia, VIC, Melbourne
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Maybe the Efflux Speed changes then.
Thrust alone does not seem to be a way to measure the total energy out. It is not a 'pure' way to measure energy.

High Blade Swept Area fans (like Taft, CS, XRP) build a more solid 'wall' of air.
Wemo, 5, 6 blade - which have Low Blade Swept Area (bigger space between the next blade coming) - send out a 'thinner' weaker wall of air... but can do that faster for the same total load/Power.
Efflux pushing out into "air" (just air behind the jet).... a 'solid wall' has a different ability level to 'push', versus the case of higher speed of less air.
It is a lot like Torque (ft/lb) versus BHP.... HBSA fans are like a V8 or truck, versus Wemo,5,6 being like a Turbo engine result.

So if you are getting the same Power used, you are probably getting the same energy, but just in a different form/balance of Efflux Speed to Thrust.
The "Thrust" you think you see on a scale is not that same thrust.... maybe there should be different words. The scale measured one is the 'final result in weight it can lift, in that specific static state'. Once flying it is different. Different than a system deriving that static Thrust from higher Efflux Speed.
eg BOTH had the same static thrust on your scales - one was derived more via Efflux Speed, which does not excel at static state.... but excels once moving faster. (again like the V8 versus turbo car)
When the Taft is 'a bit more starved' (it is probably not 100% fed for any inlet you have anyway) its output could be that bit higher efflux instead. (some change at least) as there was less air to 'ram' down the exhaust now, so it has that bit more freedom to have speed instead. And 'speed', Efflux Speed, is poorer at converting to thrust than a 'solid wall' is.

That is what all the cases I have come across seem to add up to.....
I like Wemo EVO, Jetfans WAY more now!! And a bit of a growing dislike for CS/Taft etc. Their power cost per return is not as good. But nice sound!! So if you are willing to throw that bit of cost onto the sound return, that is fine!
But I still have quite a few CS/Taft lying around, and I hate wasting stuff.... so, they still will be used anyway.
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Last edited by PeterVRC; Jan 20, 2015 at 06:32 PM.
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Old Jan 20, 2015, 07:42 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
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you will find that once in the air you will recover any if the lost thrust at speed
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Old Jan 20, 2015, 11:05 PM
Fly it like you're in it
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Canada, ON, London
Joined Nov 2012
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Good stuff Eric, glad you've got it sorted out!
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Old Feb 12, 2015, 04:42 PM
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Canada, ON, Burlington
Joined Jan 2009
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Chris has made great progress finishing the canopy. The special split windshield on the full size made the most work. I think it must be windsheild heat (with bleed air) because the full size also had the regular flat window behind it.
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Old Feb 12, 2015, 05:09 PM
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Australia, VIC, Melbourne
Joined Nov 2006
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An amazing cockpit once again!!
Do you have a mini-museum for storing all the planes there?? LOL
I am really struggling to store all mine, and most can't be left in a place that can be viewed very well - and then add in how often they (some) crash, and BIG efforts are no good here! hehe
But yours look fantastic(!!) and i would do more of that if it seemed worth it here.

Look how small the intakes on the earlier versions were!!
I guess I am used to seeing both, but I like the smaller ones better for some reason. That was what I wanted to make up, but I am not totally sure yet.
But I definitely do not want the BIG, more squared off, inlet of the RAAF Avon version! Or at least that seems to be a third type, and the biggest of them all.
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Old Feb 12, 2015, 05:17 PM
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Canada, ON, Burlington
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The Air Sally intake looks pretty close to the Canadian version. The American Sabre intake looks smaller than the Canadian. Different engines I suppose.
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Old Feb 12, 2015, 09:46 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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your 86 is looking good ,glad the nose is working for you ,im sure there is a lot less drag at speed with the fiberglass nose ...but most of all it just looks better ...no more "catch and release" .I think the windshield you are making was on the "E" models . seen lot of pics of them. if any one wants a nose cone pm me for details ,I think the mold will last a bit longer.
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Old Feb 12, 2015, 09:54 PM
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Canada, ON, Burlington
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Thanks to our frigid weather, we still haven't flown it with your nose. Only the original 6 test flights were made. The nose will be painted along with the PFP nose. Both will be flown and if the performance is acceptable, we would like to use the AS nose. It sure looks pretty!
Cheers
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Old Feb 12, 2015, 10:36 PM
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Australia, VIC, Melbourne
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Hey Air Sally, I did PM you again a while ago.... to see the total cost (high) to Australia. (unless I missed the reply somewhere, somehow)

Though a 'delay' is somewhat convenient, as I diverted onto some other planes in that meantime!

I have the balsa to make up a full nose, of the smaller inlet type, but I don't really want to spend time on that!
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Old Feb 13, 2015, 10:17 AM
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USA, NC, Greensboro
Joined Mar 2002
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Awesome cockpit!! Amazing!
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Old Feb 13, 2015, 11:12 PM
Fly it like you're in it
microlyn's Avatar
Canada, ON, London
Joined Nov 2012
797 Posts
Really great job on the cockpit/ canopy Erics dad!
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Old Feb 13, 2015, 11:31 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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Peter I pretty sure I pm you back ...ill ck and get back to you.
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Old Feb 13, 2015, 11:54 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
21,589 Posts
Your right ,I remember looking up the price of shipping .....but I guess I forgot to pm you .sorry about that . ill see what I can do .
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Old Feb 25, 2015, 11:20 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
21,589 Posts
Peter and air-jer I shipped your nose cones today ,let me know when you get them.
any one else want one ,pm me for details .Thanks guys .
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Old Feb 25, 2015, 11:26 PM
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Australia, VIC, Melbourne
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Thank you!
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