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Old Dec 23, 2011, 07:13 AM
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Quote:
Originally Posted by jackosmeister View Post
I think the http://www.reisenauer.de prop was a copy of the marcus koch one (from memory) different blade roots or something though, 7x13 maybe, but it doesnt seem to be listed anymore anyway!

And subscribed
Another possibility Jacko!

Actually it was a 10x17 which would be perfectly suitable for our purposes with a slightly higher kV! I came across your post: https://www.rcgroups.com/forums/show...0&postcount=29
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Old Dec 23, 2011, 07:16 AM
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Livin it UP when Im goin DOWN
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Quote:
Originally Posted by Peter M View Post
Assuming you're are talking about Marcel Schlage's Muncie WC model, the only info I could find is: https://www.rcgroups.com/forums/show...0&postcount=49
Rpm from doppler gives reason to suspect 6S. 10k rpm means 5S.
Old Dec 29, 2011, 06:21 AM
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Ordered a couple of sets of Powercroco folder blades from Marcus today.

9.8x17.5 and 8.5x23 for 28 Euros a pair of blades plus 3.60 Euros for postage. Should ship in one to two weeks.

So:
Motor - Check!
Airframe - Check!
Prop - Check!


Now just have to wait for delivery of said items........

(A GM 18x21 prop turned up today for my Enigma. I was frankly unprepared for how beautiful it is!)
Last edited by Peter M; Dec 29, 2011 at 06:47 PM. Reason: Spelling and clarify price
Old Dec 29, 2011, 06:46 AM
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never mind the boll⁣⁣⁣ocks
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its almost a pity it will be too fast to admire in flight
Old Dec 29, 2011, 07:02 PM
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Ah, there will be plenty of time to admire it as I'm a bit anxious about this Engima so it's currently head to head with my quarter scale Gee Bee Y as my slowest build ever!

(Although I'm running out of excuses quickly. Joe emailed this morning to say my P180 logic board has arrived safely in old Blighty ready for it's "Big George" mod. I thought that was a nice touch of Joe's to let me know as I feel like an expectant parent! Once the logic board returns I have everything to complete the build except for the elephantine gonads of course!)
Last edited by Peter M; Dec 29, 2011 at 07:16 PM.
Old Jan 11, 2012, 03:54 PM
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Progress:
Kira 480-31 5.2:1 arrived yesterday
Marcus posts the blades off next week
Just waiting to hear from Big Bruce........
Old Jan 11, 2012, 04:48 PM
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Livin it UP when Im goin DOWN
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Keep it up, Mate!
Open the KPG and add some good grease now, willya!
Old Jan 16, 2012, 04:12 AM
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Update on Double Oversquare Folders


https://www.rcgroups.com/forums/show...3&postcount=12
Old Feb 06, 2012, 03:37 AM
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Quote:
Originally Posted by Peter M View Post
Ordered a couple of sets of Powercroco folder blades from Marcus today.

9.8x17.5 and 8.5x23 for 28 Euros a pair of blades plus 3.60 Euros for postage. Should ship in one to two weeks.

So:
Motor - Check!
Airframe - Check!
Prop - Check!
My blades turned up today!

I was also pleased to find that they will fit the 38mm RFM yoke and spinner with only a small bit of grinding of the spinner to make room for the blade roots. Haven't tried my 30mm spinner yet though!

The blade roots are big on these blades as they are made for Speedcup use which means big power and high rpms. Marcus posted last week that his newest Speedcup plane will peak at 12kW! ( https://www.rcgroups.com/forums/show...87&postcount=5 )

Since my Summit and possibly an X Plane are still some time away, my trusty old Plasma will getting a make over this weekend.
Last edited by Peter M; Feb 06, 2012 at 02:51 PM.
Old Feb 06, 2012, 03:45 AM
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Those blades are awesome, following closely I have a new X on the way, along with a 2nd fuselage for coming up with nuts setup in...
Old Feb 09, 2012, 03:58 AM
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i know a bloke who would like to try them on his Plasma, but i wouldnt trust his landings! LOL
Old Feb 09, 2012, 05:20 AM
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I think I know him too!

I'm sure he will get a go soon enough!
Old Feb 11, 2012, 12:58 AM
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Dr Marcus Koch - 9.8 x 17.5 Blades


Today I got to very briefly run my new Koch 9.8 x 17.5 on an RFM spinner, Kontronic Kira 480-31 5.2:1 and Turnigy 5 cell 1800mAh 30-40C battery in my Plasma II and was pleasantly surprised at the nice mix of acceleration and speed.

Inflight reasonably level and unloaded gave:
17.6 volts or 3.52 volts per cell at 17% discharge
59 amps
1034 watts
10,715 rpm or a pitch speed of approximately 178 mph

Sounded nice too!
Last edited by Peter M; Feb 11, 2012 at 04:11 AM.
Old Feb 12, 2012, 12:57 AM
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Dr Marcus Koch - 8.5 x 23 Blades


Today I ran my new Koch 8.5 x 23 blades on an RFM spinner, Kontronic Kira 480-31 5.2:1 and Turnigy 5 cell 1800mAh 30-40C battery in my Plasma II and was excited at the speed. The acceleration was obviously slower that of lower pitch blades but was more than adequate!

Inflight reasonably level and unloaded gave:
17.5 volts or 3.5 volts per cell at 26% discharge
49.6 amps
867 watts
10,629 rpm or a pitch speed of approximately 232 mph (373kph)

Now the above results were a surprise to me because you'll notice that in the ICE graph, the prop rpm ACTUALLY REDUCED along with current and wattage from the beginning of the run to the end. I actually checked each run and they are the same! That is so different to what I'm used to with square or undersquare props where the rpm increases as the prop unloads as the planes accelerates up to top speed.

Did put a smile on my dial!
Old Feb 12, 2012, 02:02 AM
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It's only a couple of hundred rpm drop, could be voltage. Its definetly different though!

thats some nuts pitch speed for such low watts!


The big question is, was it fast?

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