Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Fastest Engine

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Old 03-25-2007, 09:45 PM
  #126
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Go Hooty go!!!
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Old 03-27-2007, 01:23 PM
  #127
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I could have sworn I posted this a while back here (maybe in another thread) but the current World Record boat went 140.36mph in Nov 2006. These are the boats and designers. If you notice, the design has very little lifting surface in the sponson area and uses the body to create the lift and stability. The sponsons give floatation and have small skis on the bottom so it lifts more like a barefoot water skier and less like a ski boat. Most of the typical outriggers have a lot of angle of attack at the leading edge of the sponsons which start lifting too much at higher speeds and they become really loose and often flip. These guys have it mastered but the principles are doable...
http://www.drcwebservices.com/lasaw/images/joerg1.jpg
http://www.drcwebservices.com/lasaw/images/joerg3.jpg
Video: http://www.crumbgrabber.com/06lasawv...dro_140mph.wmv
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Old 03-28-2007, 12:26 AM
  #128
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Hey thanks for sharing, If I remember right they couldnt back that run up with a second pass so the previous record 120.7mph avg still stands which is also held by the same team.

[link]http://www.youtube.com/watch?v=9sofMLyHRt0[/link]

Im going for a little different record which uses airpower and is held over on Rc Airboat World, once fast enough though maybe there will be a spot for airpower at the SAW's.
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Old 03-28-2007, 01:32 PM
  #129
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That vid you have is from 2003, they backed up the 140 pass in November 2006 which is the video I posted. Good luck on your airboat. It takes a lot of work and tinkering to go fast on water. I've seen quite a few boats go down in the lake in the pursuit.
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Old 03-28-2007, 01:48 PM
  #130
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An earlier post mentioned using a bladder tank, I completely agree, regardless of what motor you use. Using a bladder tank gives additional pressure, does not go lean as the tank empties, and eliminates the need to pad the tank (it can be hard mounted).

As to wood props, if you completely soak them in Thin CA for about a minute a blade, lightly sand with 400 grit, and then finish polish with Mothers, it will be very water resistant. I use a 6" long, 1" diameter piece of capped pipe. PVC works fine also. After I'm done, I pour the CA back into a couple 2 oz bottles and put in the freezer untill you need to use it again. If you do this, DEFINATELY use good ventilation.
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Old 03-29-2007, 12:06 AM
  #131
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Quote:
An earlier post mentioned using a bladder tank, I completely agree, regardless of what motor you use. Using a bladder tank gives additional pressure, does not go lean as the tank empties, and eliminates the need to pad the tank (it can be hard mounted).

As to wood props, if you completely soak them in Thin CA for about a minute a blade, lightly sand with 400 grit, and then finish polish with Mothers, it will be very water resistant. I use a 6" long, 1" diameter piece of capped pipe. PVC works fine also. After I'm done, I pour the CA back into a couple 2 oz bottles and put in the freezer untill you need to use it again. If you do this, DEFINATELY use good ventilation.
Thanks for the info.
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Old 03-31-2007, 12:54 AM
  #132
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Troy Rcu, you are right sorry for second guessing you, I dont know where I got my info from .
Anyways I wonder what 2007 is gonna bring?? Them electrics sure do scream!! Ive been lookin around on the web for info on the Saws, found some pretty good stuff on the Rum Runners forum but would like to know more. Do you have any links you could share about the Saws?
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Old 03-31-2007, 01:00 AM
  #133
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My buddy Mark has been one of the organizers for the SAW event so I've been to a few. I missed the one in November but got the play-by-play from Mark. One of my old F5D Teammates is Brian Buaas who broke a few records in the last event. That's what happens when a really good airplane guy starts tinkering with boats.
Links... this is the only other place besides Rum Runner I know of: http://www.drcwebservices.com/lasaw/default3.htm
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Old 05-15-2007, 11:46 PM
  #134
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Thanks for sharing the link Troy.


I made a lil progress, I got both of the sponsons framed and a start on the tub. Here are a couple of pics...







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Old 05-16-2007, 10:40 PM
  #135
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Nice work! Did you design the sponsons and tub yourself? If so, it would be interesting to see drawings or plans to understand your design process.
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Old 05-16-2007, 11:44 PM
  #136
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Thanks Craig!

Yes I did do the designing, I got alot of inspiration for the sponsons from the saw's boats. Heres a pic I had on file of the plans for the sponsons.
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Old 05-17-2007, 12:04 AM
  #137
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Default RE: Fastest Engine

what enegine did you go with i didnt read all the post. i know the early on the guys were wrong with the higher pitch. a jett engineering .90 lite and a 12x6 prop will give you the speed you need. even a .50 -.60 from jett with a 10x6 will get you real close. you need high rpm and low pitch to give you the thrust to move this boat at 70mph. i have been aorund planes for a long time and have made all kindsof stuff and if need some help on anything let me know, send me an email
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Old 05-17-2007, 12:20 AM
  #138
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Quote:
ORIGINAL: airraptor

what enegine did you go with i didnt read all the post.
Post 124 says:
"I went ahaed and got the .91fx which I will use with a tuned exuast and am going to use this engine for testing. Once shes ready for it I plan to bolt on a .91vr-df with a prop. "
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Old 05-17-2007, 12:05 PM
  #139
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thanks lol the os .91 and a 9x6 - 10x6 will do just fine

but the more weight he has on the boat will add drag as it goes thru the water, and more weight means higher cg.

small high rpm engines with low pitched prop will be best for him like 5-6 inch pitch range in 20,000 rpm area
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Old 05-17-2007, 11:39 PM
  #140
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Thanks for offering the help Airrapter, im trying to keep the weight down, aiming for somewhere between 5 to 6lbs rtr.
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Old 05-18-2007, 12:17 AM
  #141
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Quote:
ORIGINAL: airraptor

thanks lol the os .91 and a 9x6 - 10x6 will do just fine

but the more weight he has on the boat will add drag as it goes thru the water, and more weight means higher cg.

small high rpm engines with low pitched prop will be best for him like 5-6 inch pitch range in 20,000 rpm area
Huh???

9X6 or 10X6 on a .91FX? No way...it would make a lot of noise, but don't think it would go very fast.

You can't use those props on the DF engine either, or they'll fly apart...

Gotta go with the carbon props with the DF .91 right?
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Old 05-18-2007, 12:30 AM
  #142
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The .91FX is in a .61 size case that's been bored out (and stroked ) so the intake passages in the case are consequently smaller, and less capable of high r.p.m. flow.

In other words, it's going to be r.p.m. limited...

IMO if you want some power out of the .91FX put an Ultra Thrust or Jett muffler on it and an APC 13x6 sport prop on it. (the 13x6 "sport" has the thin "E" style blades, so it won't drag the engine down as much as some of the thicked bladed props )
I think that should be squeezing about as many r.p.m. as you could practically get out of it, and give you enough disc area to give ya some thrust. Run the same 15% fuel you have been in the .61FX.

The DF .91 is going to have to rev to around 20,000-23,000 to get max power out of it, and only a carbon prop is gonna take that kind of r.p.m.

Ya might have to get some custom props made up?

Didn't we already talk about this?[sm=confused.gif]

Edit: Yeah...we did...
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Old 05-18-2007, 02:43 AM
  #143
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Yes we have already talked about that. Im planning on running a 10/10 on the DF motor and am currently running a 12/8apc on my 91fx with good results. I will definatly try the 13/6apc though, it sounds like a good prop having the thin blades.
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Old 05-18-2007, 11:05 PM
  #144
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Quote:
what enegine did you go with i didnt read all the post. i know the early on the guys were wrong with the higher pitch. a jett engineering .90 lite and a 12x6 prop will give you the speed you need. even a .50 -.60 from jett with a 10x6 will get you real close. you need high rpm and low pitch to give you the thrust to move this boat at 70mph. i have been aorund planes for a long time and have made all kindsof stuff and if need some help on anything let me know, send me an email
Airrapter, these guys know what there talking about and have given me lots of good info, you should read the whole thread before saying there wrong. You will find that they are very knowledgable on this subject and will also see that we have disscussed different props and the whole thrust issue.
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Old 06-19-2007, 12:17 AM
  #145
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Just to get an idea of what the nitro version is gonna look like, I scaled it down some and came up with this. Ive got a lil two cell lipo setup im going to use to power it with. Its just about done, got to add the finish coat and the electronics. Thought I would share a couple of pics with you guys.








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Old 06-19-2007, 05:15 AM
  #146
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Hey...that's cool!
Very nice craftsmanship too [sm=thumbup.gif]
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Old 06-19-2007, 11:06 AM
  #147
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....YEAH, BABY !!!
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Old 06-19-2007, 11:17 AM
  #148
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Now that is cute!
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Old 06-19-2007, 11:29 AM
  #149
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Default RE: Fastest Engine

That looks Great!! Looks fast just sitting there.
Is the motor going to be 'pylon-mounted'?
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Old 06-19-2007, 01:33 PM
  #150
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Nice craftsmanship! I can't wait to see it on the water.
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