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Old Sep 16, 2012, 06:55 PM
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Damn! It was gusting too hard by the time I was ready to go back to the field. Now I'll have to wait until Thursday when I get off early from work to fly her. The sun is too low after work on normal days now. Bye-bye summer.

Thanks for all your well-wishing guys.
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Old Sep 16, 2012, 07:13 PM
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I like 50mm too..
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Old Sep 18, 2012, 08:22 AM
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Singapore
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My E-Wasp on the maiden.
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Old Sep 18, 2012, 08:25 AM
Peter, irl
Canada, QC, Montreal
Joined May 2012
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Quote:
Originally Posted by Jabberwocky_ View Post
Damn! It was gusting too hard by the time I was ready to go back to the field. Now I'll have to wait until Thursday when I get off early from work to fly her. The sun is too low after work on normal days now. Bye-bye summer.

Thanks for all your well-wishing guys.
If you're planning on flying this weekend (weather forecast is not looking favourable) let me know, I'd love to come watch. My Reverb is getting there but I'm still several build-hours away from a maiden.
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Old Sep 18, 2012, 11:39 AM
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I maidened my new Swift w/the HET 2w23, 5.25x6.25 and a 65C 2200ma yesterday.

My flying buddy has the same setup and the engine would be about 135º after landing. I got 145º on both the battery and motor. I assume its because I don't know what throttle management is - I'm an on/off type flyer.

The speed seemed a little faster than the 2w25 with a 5x5 but not by too much (no data, just an impression) but I like the -23 a wee bit better...
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Old Sep 18, 2012, 11:54 AM
Lloyd Robinson
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USA, MO, St Louis
Joined Jun 2007
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I tried the 5.25x6.25 on my Reverb over the weekend. Mega 16/25/2 F5D, Gens Ace 4s 2200 mAh 25C. We had some trouble getting RC Speedo to pick it up - only got a handful of dopler readings. Fastest was 175 mph. Not sure I believe that one. The others were around 170 mph. Only got about 1:30 of full throttle per pack with that prop. By comparison, I was getting about 160 mph with the 5.25x4.75 and the current draw seemed to be significantly lower. My interpretation of this is that the higher pitch prop is not making a big improvement in speed while it is costing a lot of amps. I think the airframe is a bit draggy for this size prop. Maybe something closer to 6" is needed to see 180 mph. I'd really like to try the Graupner Cam speed 5.5x4.3 but it won't fit on my cheapo spinner. Guess I could just use a prop adapter.
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Old Sep 18, 2012, 01:42 PM
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Staffs, UK
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Fishboy, have you tried the APC 4.75 (dia) x 5.5 (pitch) prop, think it's classed as a pylon prop?

A calc program I have claims the 16/15/3 on 3s and a 4.75x4.75 APC is 28a and 130mph pitch speed, the 4.75x5.5 is 'only' 32a but 148mph pitch. In reality my 16/15/3 was closer to 32a on the 4.75x4.75 but maybe that's down to batteries holding voltage better than the calc says.

Ok calcs aren't great and can be way off, but maybe for a few £££/$$$ it might be worth a try?

Only point about that prop is I'm not sure it gives you that extra speed that easily. Kinda hard to explain but I think you need to get your turns right to carry the speed. If you screw that up, it doesn't seem to be any faster IMO.

BTW, I only tried that prop on a Cavallino, probabaly not the best airframe to try it on really, and I didn't get many turns right either!
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Old Sep 18, 2012, 02:38 PM
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Interesting observation, FB!
I still think 170 is a great number, and with 1:30 motor time it's quite economical too.
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Old Sep 18, 2012, 02:53 PM
Lloyd Robinson
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USA, MO, St Louis
Joined Jun 2007
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Quote:
Originally Posted by feefo View Post
Fishboy, have you tried the APC 4.75 (dia) x 5.5 (pitch) prop, think it's classed as a pylon prop?

A calc program I have claims the 16/15/3 on 3s and a 4.75x4.75 APC is 28a and 130mph pitch speed, the 4.75x5.5 is 'only' 32a but 148mph pitch. In reality my 16/15/3 was closer to 32a on the 4.75x4.75 but maybe that's down to batteries holding voltage better than the calc says.

Ok calcs aren't great and can be way off, but maybe for a few £££/$$$ it might be worth a try?

Only point about that prop is I'm not sure it gives you that extra speed that easily. Kinda hard to explain but I think you need to get your turns right to carry the speed. If you screw that up, it doesn't seem to be any faster IMO.

BTW, I only tried that prop on a Cavallino, probabaly not the best airframe to try it on really, and I didn't get many turns right either!
Hey now Feefo. I have not tried the 4.75x5.5 on the Reverb. I found that the 4.75x4.75 was lacking in thrust as evidenced by the fact that I got much better performance with the 5.25x4.75. So I assumed that the extra pitch of the 4.75x5.5 wouldn't do any good for this airframe. However, that is my favorite prop for the Rifle on 3s with the Het 3W. It is almost as fast with that setup as it is on 4s with a 4.1x4.1.

I think you are right about the turns. And I think the reason for that is drag. With a small prop on the Reverb you better be efficient with your flying or else you will drop a lot of airspeed and the plane will take a while to get back up to speed because it is not very aerodynamic compared to something like a Viper that has a razor-thin wing. That's my guess anyway.
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Old Sep 18, 2012, 02:54 PM
Lloyd Robinson
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USA, MO, St Louis
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Originally Posted by Arcteryxxx View Post
Interesting observation, FB!
I still think 170 is a great number, and with 1:30 motor time it's quite economical too.
Haha yeah Arctery I know you have gone with the 6x5.5 all along. I'll have to give that a shot.
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Old Sep 18, 2012, 03:19 PM
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There's also the APC Pylon props intended for 'gas'. They're available in 6.5" dia and 5, 5.5, 6 and 6.5 pitch. They normally drop a few amps over the electric version i.e 6x4 pulls less than a 6x4E so you might be able to use the 6.5x5 or 6.5x5.5 over the 6x5.5E.
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Old Sep 18, 2012, 03:34 PM
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Originally Posted by fishboy77 View Post
Haha yeah Arctery I know you have gone with the 6x5.5 all along. I'll have to give that a shot.
Actually there's a 5.25x6.25 on the speeder now, but I haven't flown it yet with that prop.
With APC pylon props you will have insane vertical performance but you will lack the top speed and drawing too many amps. I have used a 6.5x6.5 in a Stryker with the MEGA 16/25/2EC at appx 110A on 4S with a 4S5000 lipo. With a 16/25 F5D you can expect around 120A and 27000rpm if - and only if - your battery can deliver. Will sure be a rather interesting but unfortunately short flight with a 4S2200...
Please post a video

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Old Sep 18, 2012, 03:55 PM
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Well I was thinking more the 6.5x5 (or maybe the 6.5x5.5 but I think it'd be too much) in comparison to the 6x5.5E. But you're probabaly right in them being too thrusty for this plane and I doubt they'll give the top speed FB is looking for anyway.

But...you could cut them down, so you could use the 6.5x6.5 cut down to say 5x6.5.
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Old Sep 18, 2012, 04:31 PM
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Why not make a 6x8 from a 7x8sport? Would be a sturdy bastard, tho
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Old Sep 18, 2012, 05:19 PM
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Originally Posted by Arcteryxxx View Post
Why not make a 6x8 from a 7x8sport? Would be a sturdy bastard, tho
Don't want to catch them on landing tho
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