34% Extra goes super sonic...

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Ramz · 07-20-2006, 10:29 PM

Ok guys....Me and Chris R were joking about how fast a 34% Extra would go if it had no wings and was driving straight down an asphalt highway at WOT...LOL. But on a more serious note, how fast would that plane go? Setup is a DA100 on muffs, Vess 27C, about 27lbs. Any thoughts?

Jaybird · 07-20-2006, 10:37 PM

I GPS'd my 33% Cap when I had the Brison 95, Menz 26-10 and got 106. I was really expecting about 80-85. Made me rethink those full throttle passes.
Brian

ChrisR · 07-20-2006, 10:41 PM

I want to know the speed with no wings and on a nice flat asphalt road. I think it would haul ass if it were controllable.

torquen · 07-20-2006, 10:57 PM

It can only go as fast as the rpm x the pitch of the prop converted into feet per rev. Just a little over 90-110 would be my guess. Even with this fact, you have to add in drag factor and prop efficiency.
Garrett Morrison

snapplane · 07-20-2006, 11:02 PM

i dont see how u could control it for one and how would you ever get that thing to stop, non the less i really want to see it.

**TheTank** · 07-20-2006, 11:28 PM

With over-rev of the motor with no wings.... motor would probably spin up to 10K or so, maybe higher. At the propellors max efficiency, and RPMs unloaded at 10K, you are looking at a max speed of 94.69696969 MPH. If the motor were to free-spool up to 15K, theoretically you could achieve at max efficiency, 142.0454545 MPH.

SleepyC · 07-21-2006, 12:00 AM

Tank Please Chick your math...
At Free spool, my max efficiency I calculated was
142.045454545454.

Man.. and to think you were going to let that slide by.
That is a disgrace my friend.. a pure and simple disgrace.

**TheTank** · 07-21-2006, 12:06 AM

	Quote: Originally Posted by SleepyC
	Tank Please Chick your math... At Free spool, my max efficiency I calculated was 142.045454545454. Man.. and to think you were going to let that slide by. That is a disgrace my friend.. a pure and simple disgrace.

Your right! It did go out in continuam! I should have rounded it off to 142.045455 good catch!

ouch! · 07-21-2006, 01:05 AM

You guys are all wrong

its E=MC Squared

sheesh

robsotelo · 07-21-2006, 03:11 AM

	Quote: Originally Posted by Teamsme
	You guys are all wrong its E=MC Squared sheesh

more like E = MC Hammer.

**TheTank** · 07-21-2006, 07:32 AM

	Quote: Originally Posted by robsotelo
	more like E = MC Hammer.

haha! I forgot about that equation! Definetly applicable!

SUPERFLYJAY · 07-21-2006, 02:15 PM

HEY TANK AND SLEEPY YOU GUYS GOTTA GET A LIFE !!!!!!!!!!!!!!

ouch! · 07-21-2006, 04:39 PM

Mathematics are cool, me fail english.

thats unpossible.

SleepyC · 07-21-2006, 04:50 PM

I majored in Beerology in College.
Then Flunkology, and Babeology came with that.
Should have focused on makinbankology, or possibly studyology...
been better off now!!

paffy · 07-21-2006, 07:37 PM

Now you can't just go by the pitch - it's usually measured at the flat backside of the blade airfoil. The airfoil is actually oriented at something like +2 degrees compared to the pitch rating line. Also, props use non symmetrical airfoils, so they still generate lift (lots of it) at 0 AoA.

Combination of the above will give you something like 20%-30% increase over the baseline top speed calculated solely from pitch rating.

A plane with 10 pitch prop at 7500 RPM should in theory have maximum speed of 71 mph, yet most are actually clocked at 90-100 mph range.

P.

07-20-2006, 10:29 PM	#1
Ramz Flying Circles Join Date: Jan 2006 Location: New Brunswick, Canada Age: 30 Posts: 353	34% Extra goes super sonic... Ok guys....Me and Chris R were joking about how fast a 34% Extra would go if it had no wings and was driving straight down an asphalt highway at WOT...LOL. But on a more serious note, how fast would that plane go? Setup is a DA100 on muffs, Vess 27C, about 27lbs. Any thoughts? Last edited by Ramz; 07-20-2006 at 10:46 PM.

07-20-2006, 10:37 PM	#2
Jaybird Shake and Bake Join Date: Jan 2006 Location: Jay Florida Age: 37 Posts: 1,740	Re: 34% Extra goes super sonic... I GPS'd my 33% Cap when I had the Brison 95, Menz 26-10 and got 106. I was really expecting about 80-85. Made me rethink those full throttle passes. Brian

07-20-2006, 10:41 PM	#3
ChrisR Bad-ass Super Contributer! Join Date: Jan 2006 Location: Canada Age: 26 Posts: 260	Re: 34% Extra goes super sonic... I want to know the speed with no wings and on a nice flat asphalt road. I think it would haul ass if it were controllable.

07-20-2006, 10:57 PM	#4
torquen Bad-ass Super Contributer! Join Date: Jan 2006 Location: Lodi, Ca. USA Posts: 1,120	Re: 34% Extra goes super sonic... It can only go as fast as the rpm x the pitch of the prop converted into feet per rev. Just a little over 90-110 would be my guess. Even with this fact, you have to add in drag factor and prop efficiency. Garrett Morrison

07-20-2006, 11:02 PM	#5
snapplane free stylin Join Date: Jan 2006 Location: PA Age: 22 Posts: 111	Re: 34% Extra goes super sonic... i dont see how u could control it for one and how would you ever get that thing to stop, non the less i really want to see it.

07-20-2006, 11:28 PM	#6
TheTank I'm Watching You! Join Date: Jan 2006 Location: Connecticut, USA Age: 31 Posts: 10,144 Awards Showcase Total Awards: 2	Re: 34% Extra goes super sonic... With over-rev of the motor with no wings.... motor would probably spin up to 10K or so, maybe higher. At the propellors max efficiency, and RPMs unloaded at 10K, you are looking at a max speed of 94.69696969 MPH. If the motor were to free-spool up to 15K, theoretically you could achieve at max efficiency, 142.0454545 MPH. __________________ "Hey at Joe Nall I personally saw Tank kick a kitten in the face!" --66Stang J'Tec Radiowave 3D HobbyShop Aircraft International

07-21-2006, 12:00 AM	#7
SleepyC Thanks for the Support! Join Date: Jan 2006 Location: USA, OH, Aurora Age: 40 Posts: 22,071 Awards Showcase Total Awards: 4	Re: 34% Extra goes super sonic... Tank Please Chick your math... At Free spool, my max efficiency I calculated was 142.045454545454. Man.. and to think you were going to let that slide by. That is a disgrace my friend.. a pure and simple disgrace. __________________ Get the most current up-to-date R/C modeling news: www.flyinggiants.com www.rcgroups.com www.crackroll.com www.rccars.com

07-21-2006, 01:05 AM	#9
ouch! Its fokker time Join Date: Jan 2006 Location: Baltimore Age: 22 Posts: 347	Re: 34% Extra goes super sonic... You guys are all wrong its E=MC Squared sheesh __________________

07-21-2006, 02:15 PM	#12
SUPERFLYJAY Bad-ass Super Contributer! Join Date: Jan 2006 Location: STONY POINT N.Y USA Age: 59 Posts: 1,103	Re: 34% Extra goes super sonic... HEY TANK AND SLEEPY YOU GUYS GOTTA GET A LIFE !!!!!!!!!!!!!!

07-21-2006, 04:39 PM	#13
ouch! Its fokker time Join Date: Jan 2006 Location: Baltimore Age: 22 Posts: 347	Re: 34% Extra goes super sonic... Mathematics are cool, me fail english. thats unpossible. __________________

07-21-2006, 04:50 PM	#14
SleepyC Thanks for the Support! Join Date: Jan 2006 Location: USA, OH, Aurora Age: 40 Posts: 22,071 Awards Showcase Total Awards: 4	Re: 34% Extra goes super sonic... I majored in Beerology in College. Then Flunkology, and Babeology came with that. Should have focused on makinbankology, or possibly studyology... been better off now!! __________________ Get the most current up-to-date R/C modeling news: www.flyinggiants.com www.rcgroups.com www.crackroll.com www.rccars.com

07-21-2006, 07:37 PM	#15
paffy Bad-ass Super Contributer! Join Date: Jan 2005 Location: Ozone Park,NY Posts: 919 Awards Showcase Total Awards: 1	Re: 34% Extra goes super sonic... Now you can't just go by the pitch - it's usually measured at the flat backside of the blade airfoil. The airfoil is actually oriented at something like +2 degrees compared to the pitch rating line. Also, props use non symmetrical airfoils, so they still generate lift (lots of it) at 0 AoA. Combination of the above will give you something like 20%-30% increase over the baseline top speed calculated solely from pitch rating. A plane with 10 pitch prop at 7500 RPM should in theory have maximum speed of 71 mph, yet most are actually clocked at 90-100 mph range. P. __________________ ---- BASF - We don't make the products you buy, we make them more expensive.

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