No.. could it be..?
06-10-2017, 10:20 PM
#630
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Just flew my SD for the first time after I installed a 50 Weston. Real screamer and super fast, I wound up loosing a rudder ad just spiraled down like a leaf. Rudder landed about a minute later. Smoother than my usual landings 
So I'll have to make the rudders stick to the plane better without adding much weight and certainly I have to dial the rates down
So I'll have to make the rudders stick to the plane better without adding much weight and certainly I have to dial the rates down
12-28-2020, 04:06 PM
#635
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I'm finally building one of the short kits Mike cut 5 years ago...and I must say, this is some of the cleanest most accurate laser cutting I have ever seen.
It will make a good home for the BSE Jett FiRe 50 that has been laying and waiting dormant for about 15 years in my engine cabinet.
This is a high timing engine I had Dub Jett put together, built for high rpm piped operation, complete with counter balanced 2" spinner.
Should be a blast.
It will make a good home for the BSE Jett FiRe 50 that has been laying and waiting dormant for about 15 years in my engine cabinet.
This is a high timing engine I had Dub Jett put together, built for high rpm piped operation, complete with counter balanced 2" spinner.
Should be a blast.
12-29-2020, 01:46 PM
#638
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I hate to break it to you, but a West 50 has never gotten anything up to 200mph.
I know, I flew them a lot.
I just ran the Jett fire 50 on the stand, it puts a West 50 to shame honestly.
I used the same header length and a Weston pipe from my Magnum, it gets on the pipe slobbering rich, with an 8x9 prop.
Where on the West 50 I ran an 8x8, and the engine was giving all it could give.
I will set the header length tomorrow.
Hoping to see over 22.000 rpm when I'm done.
I know, I flew them a lot.
I just ran the Jett fire 50 on the stand, it puts a West 50 to shame honestly.
I used the same header length and a Weston pipe from my Magnum, it gets on the pipe slobbering rich, with an 8x9 prop.
Where on the West 50 I ran an 8x8, and the engine was giving all it could give.
I will set the header length tomorrow.
Hoping to see over 22.000 rpm when I'm done.
Last edited by Rudeboy; 12-29-2020 at 01:48 PM.
12-29-2020, 04:57 PM
#639
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I flew my prototype Demon on a West .50 that I previously flew on a Magnum R. I set it up on the bench with an open pipe peaking at 20,500 rpm, best speeds were on a 8.8x9.25 trimmed down to about 8.25". I would say the Demon was a good 10-15 mph faster than the Magnum., which corresponds with the typical speeds recorded for West .50 Magnums which are in the 165 mph range. I recall that one person reported that the best radar clocking of their Magnum combo was 167 mph. A strong .50 on a clean Demon is good for 170-175. When I swappeds out th Est .50/open pipe combo for a SportJett .50 SE with the regular red muffler, I could not tell any difference in top end if there was any. An immigrated European F3D pylon flier saw it when I visited a local club one day, and shouted out after the first fast pass, in a thick Russian accent "dat must be sree hundret kilometers per hour!".
This is the absolutely terrible (yes I know!) video taken of the test flight - this was the prototype of the Demon after I had taken over the kit way back, and was the first time I had ever flown a delta to boot. So I kept it 300 feet up or so most if the time until I got more comfortable, as the field is ringed by trees. Plus, the guy filming had no idea what to expect or how to film moving objects..
The Magnums were quick indeed, but the ad copy was absolute hogwash! Apparently Dub Jett tested one of the West.50's and was impressed with the power output nonetheless.
This is the absolutely terrible (yes I know!) video taken of the test flight - this was the prototype of the Demon after I had taken over the kit way back, and was the first time I had ever flown a delta to boot. So I kept it 300 feet up or so most if the time until I got more comfortable, as the field is ringed by trees. Plus, the guy filming had no idea what to expect or how to film moving objects..
The Magnums were quick indeed, but the ad copy was absolute hogwash! Apparently Dub Jett tested one of the West.50's and was impressed with the power output nonetheless.
01-11-2021, 07:10 PM
#641
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Nice work!
Did you add shear webs at the back of the D box? Will really perk up the torsional stiffness. Glad to see the wing jigs doing their thing!
You have the makings of a 300kph machine there.
Did you add shear webs at the back of the D box? Will really perk up the torsional stiffness. Glad to see the wing jigs doing their thing!
You have the makings of a 300kph machine there.
04-18-2021, 03:16 PM
#643
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West 50 vs Jett fire 50
I flew my prototype Demon on a West .50 that I previously flew on a Magnum R. I set it up on the bench with an open pipe peaking at 20,500 rpm, best speeds were on a 8.8x9.25 trimmed down to about 8.25". I would say the Demon was a good 10-15 mph faster than the Magnum., which corresponds with the typical speeds recorded for West .50 Magnums which are in the 165 mph range. I recall that one person reported that the best radar clocking of their Magnum combo was 167 mph. A strong .50 on a clean Demon is good for 170-175. When I swappeds out th Est .50/open pipe combo for a SportJett .50 SE with the regular red muffler, I could not tell any difference in top end if there was any. An immigrated European F3D pylon flier saw it when I visited a local club one day, and shouted out after the first fast pass, in a thick Russian accent "dat must be sree hundret kilometers per hour!".
This is the absolutely terrible (yes I know!) video taken of the test flight - this was the prototype of the Demon after I had taken over the kit way back, and was the first time I had ever flown a delta to boot. So I kept it 300 feet up or so most if the time until I got more comfortable, as the field is ringed by trees. Plus, the guy filming had no idea what to expect or how to film moving objects..https://www.youtube.com/watch?v=GwczbiYatJg
The Magnums were quick indeed, but the ad copy was absolute hogwash! Apparently Dub Jett tested one of the West.50's and was impressed with the power output nonetheless.
This is the absolutely terrible (yes I know!) video taken of the test flight - this was the prototype of the Demon after I had taken over the kit way back, and was the first time I had ever flown a delta to boot. So I kept it 300 feet up or so most if the time until I got more comfortable, as the field is ringed by trees. Plus, the guy filming had no idea what to expect or how to film moving objects..https://www.youtube.com/watch?v=GwczbiYatJg
The Magnums were quick indeed, but the ad copy was absolute hogwash! Apparently Dub Jett tested one of the West.50's and was impressed with the power output nonetheless.
I have the Jett now where it does what it can do with the Weston pipe.
It did just over 21k on 20% fuel.
The header was cut to the point where it was unhappy on 12%, then I ran 20% and it sounded happy again.
Mind you, this is with a rear exhaust engine, straight header, way shorter than you could ever run the header on a Magnum/West 50.
The Weston pipe is just too mellow for some real power.
I'm half tempted to go through the bucket of obsolete F3D pipes I have, and modify one of those to get the engine where I want it to be.
I'm just worried the stingers on F3D pipes are too small for a 50 on 20% nitro...it's gonna build up heat in the engine.
04-19-2021, 04:39 AM
#644
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The West pipe is heavy too. I switched to a MAC's open pipe on the West .50, and set it up to run about 21 - 21.5k on trimmed APC pylon props. It ran great and it was fast, but it never topped the SportJett .50.
04-19-2021, 08:28 AM
#645
I make my own carbon fiber pipes, and I know Dub uses MACS pipes (When Dave was alive, I don't know how many he has left). Dub told me that the best results were obtained with a stinger diameter of .296" on the .50. I make my pipes with this diameter and they work very well.
Scott
Scott
04-19-2021, 08:47 AM
#647
04-19-2021, 09:35 AM
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Now that's a real gem you have there...I'm green with envy to be honest!
Whatcha running for a prop? APC Q40?
How do you keep those carbon pipes from melting?
It's probably not a fair comparison, but my F3D pipes run at temperatures no epoxy could survive...
Whatcha running for a prop? APC Q40?
How do you keep those carbon pipes from melting?
It's probably not a fair comparison, but my F3D pipes run at temperatures no epoxy could survive...
Last edited by Rudeboy; 04-19-2021 at 09:40 AM.
04-19-2021, 10:12 AM
#650
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I make my own carbon fiber pipes, and I know Dub uses MACS pipes (When Dave was alive, I don't know how many he has left). Dub told me that the best results were obtained with a stinger diameter of .296" on the .50. I make my pipes with this diameter and they work very well.
Scott
Scott
What I need now is a CF 15cc pipe for the Macchi, having just decided on the engine set-up and pulling the kit out of mothballs last week. And a Rossi 40402 offset header to mount the engine inverted.
As I recall about 1.5 years ago or so when we last spoke Dubb had 8-10 of the pipes he used on the .35 left, so there was an end in sight.