SP400 Rocket 4:1 what prop?

LJH · Feb 08, 2002, 09:11 AM

I have dreams of seeing my DMA Butterfly go vertical. and I was thinking that maybe I could use the Rocket 400 and my 4:1 gear box that it may work. The gearbox will add about 1oz so all up weight will be around 15 oz. I was wondering if anyone has experience with the SP400 Rocket @ 4:1 could give me an idea of where to start with the prop, or even better if someone could run it through Motocalc to see what kind of thrust they predict.

Cheers,
Jim

DeaninMilwaukee · Feb 08, 2002, 09:22 AM

I used the rocket geared 4.09:1 with a gws 10x8 on 8 600ae's on my 17-7/8ths oz Frenzy and found it would hover and torque roll for the first 2 minutes.

Top speed was only around 40 or so, but that is prob just about right for the Butterfly.

Amps by the way are quite reasonable, and neither motor or batts get overly warm.

Please give us a flight report when you test it out.

DeaninMilwaukee

Bill Glover · Feb 08, 2002, 06:35 PM

Don't know what a Rocket 400 is, but on stock 6V S400 with 4:1 gearing and 8 cells I use APC-E 11x8.5.

poobs · Feb 08, 2002, 08:34 PM

LJH

http://custompaintjob.com/ezcalc/dma.asp

LJH · Feb 09, 2002, 11:42 AM

Thanks guys,
Wow, it actually looks like this will work

. Poobs, Thanks for the link, I have never played with P-calc or Motocalc before. That is pretty easy

. One of these days we have to get together and do a little flying.

Cheers,
Jim

LJH · Mar 04, 2002, 08:37 PM

Just finished up the the re-build of my Butterfly and this looks like it is going to work. The static thrust test shows that is will go vertical

Useing a 8X600AE and a APC 10X7 Slow Fly prop. I ran it on my Wattmeter an it shows 10.8 amps and around 90 watts. If the weather is ok out tomorrow morning I will give it a test flight and let you guys know how it went.

Cheers,
Jim

RPatrick · Mar 04, 2002, 10:08 PM

Good Luck, can't wait to hear your results!

I am planning a Rocket 400 project and am very interested!

RPatrick

poobs · Mar 05, 2002, 07:57 AM

LJH

That sounds good

Feb 08, 2002, 09:11 AM	#1
LJH Moths do not fly inverted Join Date: Sep 2000 Location: Greenwich CT. Posts: 3,974	SP400 Rocket 4:1 what prop? I have dreams of seeing my DMA Butterfly go vertical. and I was thinking that maybe I could use the Rocket 400 and my 4:1 gear box that it may work. The gearbox will add about 1oz so all up weight will be around 15 oz. I was wondering if anyone has experience with the SP400 Rocket @ 4:1 could give me an idea of where to start with the prop, or even better if someone could run it through Motocalc to see what kind of thrust they predict. Cheers, Jim

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Feb 08, 2002, 09:22 AM	#2
DeaninMilwaukee Motors beat engines! Join Date: Feb 2001 Location: Milwaukee Wisconsin, United States Posts: 4,357	I used the rocket geared 4.09:1 with a gws 10x8 on 8 600ae's on my 17-7/8ths oz Frenzy and found it would hover and torque roll for the first 2 minutes. Top speed was only around 40 or so, but that is prob just about right for the Butterfly. Amps by the way are quite reasonable, and neither motor or batts get overly warm. Please give us a flight report when you test it out. DeaninMilwaukee

Feb 08, 2002, 06:35 PM	#3
Bill Glover Registered User Join Date: Nov 2000 Location: Bracknell, Berks, UK Posts: 8,294	Don't know what a Rocket 400 is, but on stock 6V S400 with 4:1 gearing and 8 cells I use APC-E 11x8.5.

Feb 08, 2002, 08:34 PM	#4
poobs Registered User Join Date: Aug 2000 Location: oakdale, ny, usa Posts: 3,983	LJH http://custompaintjob.com/ezcalc/dma.asp

Feb 09, 2002, 11:42 AM	#5
LJH Moths do not fly inverted Join Date: Sep 2000 Location: Greenwich CT. Posts: 3,974	Thanks guys, Wow, it actually looks like this will work . Poobs, Thanks for the link, I have never played with P-calc or Motocalc before. That is pretty easy . One of these days we have to get together and do a little flying. Cheers, Jim

Mar 04, 2002, 08:37 PM	#6
LJH Moths do not fly inverted Join Date: Sep 2000 Location: Greenwich CT. Posts: 3,974	Just finished up the the re-build of my Butterfly and this looks like it is going to work. The static thrust test shows that is will go vertical Useing a 8X600AE and a APC 10X7 Slow Fly prop. I ran it on my Wattmeter an it shows 10.8 amps and around 90 watts. If the weather is ok out tomorrow morning I will give it a test flight and let you guys know how it went. Cheers, Jim

Mar 04, 2002, 10:08 PM	#7
RPatrick Registered User Join Date: Jan 2002 Location: Hurst, Texas USA Posts: 372	Good Luck, can't wait to hear your results! I am planning a Rocket 400 project and am very interested! RPatrick

Mar 05, 2002, 07:57 AM	#8
poobs Registered User Join Date: Aug 2000 Location: oakdale, ny, usa Posts: 3,983	LJH That sounds good