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Old Jun 05, 2013, 05:40 PM
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speedfreak IV onboard camera goes wrong lol (1 min 41 sec)


I tried out putting a camera on just at 50-80% throttle range on 6*4 prop and well... lol
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Old Jun 05, 2013, 05:47 PM
2012 NZ Speedcup - 231 MPH
DownUnderPilot's Avatar
New Zealand, Tasman, Richmond
Joined Mar 2006
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Hahaha, classic! I assume the plane survived?
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Old Jun 05, 2013, 05:50 PM
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yeah 0 damage I seen it come off and just kept level and landed but everything is secure inside even without a lid. Was just super funny too see lol, I did learn finding the lid against soil being black isn't easy so I will add some colour too it lol.
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Old Oct 09, 2013, 11:55 AM
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Didn't fancy re-starting a new thread seeing as I named this one "series".

I'm currently working on version 5. Version 4 just hit 180mph but I would love to brake 200mph.

I like the wing too much to give it up so I'm only building a new fuselage. This time lighter but stronger with a proper canopy top and the other compartments screwed in so no repeats of last time with the sheer speed ripping the canopy off in 2!

I purposely want a flat bottom and flat side fuselage with only the top profiled. The sides tuck in towards the tail to bring airflow directly to the tail. Everything is nicely rounded but required fibreglass and epoxied yet.

As for making sure I do pass 200mph this time I won't be using an EagleTree pitot tube but instead my nano FPV with tracking and OSD. This can relay the real time ground speed back to the ground station and means no pitot tubes on the wing causing drag.

The play off is 12g for pitot tube with drag or 24g for OSD system enclosed inside, so I choose 12g more weight and reducing drag.
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Old Oct 12, 2013, 09:26 PM
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Well since my last post I've fully sanded the fuselage and completed the rest of the fuselage top pieces. I just need to make the center canopy pod. I used some British racing green spray paint directly onto the balsa.

When the paint was dry and absorbed into the balsa I used acrylic blue paint which I watered down and soaked over, when it was dry I used spray lacquer to seal it all finishing with sanding it all smooth.

Depending what angle the light hits it switches blue/green tints pretty rustic and I like it
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Old Oct 13, 2013, 12:01 PM
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Canopy in progress. Will peg in at front then a sliding latch at the back. Very strong and only 11g at the moment.
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Old Oct 13, 2013, 02:51 PM
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Pod stained black, will get a lacquer coat tomorrow when it's not raining but otherwise finished. I used a servo control horn with a long screw as a pivot to create a switch latch. The back of the canopy has 2 carbon fibre rods that slot into the fuselage.

Can get in and out of the fuselage in no time.
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Old Oct 14, 2013, 07:27 AM
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Well it's my birthday today so I'm not doing much. However I did wrap up the fuselage last night and with 1500mAh pack the new version is 62 grams lighter than the previous.

I have 2 spinners in the post to me right now with aluminium backs so I hope their decent. These should finish of the front shape leading the airflow up to the fuselage
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Old Oct 15, 2013, 08:30 AM
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Spinners arrived today and they look good. Tried one out to see how it'll profile the air but it looks a good fit. Being a 450 shaft its pretty long but I don't mind so much as last version it helped draw air into the engine bay also.

I have to replace one of the aileron servos but no big deal, besides that this baby is RTF .. when the weather lets me
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Old Oct 19, 2013, 03:20 PM
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well I'm not afraid to come back and say the design failed. It turns out the tail was too small and kept inducing a right yaw effect along with tail heavy, when I fixed tail heavy (moving lipo forward) the same effect applied.

I don't think I want to try fix it either, all my electronics work and there was no damage to my wing or such. I'm starting to think having the wing removable is only causing issues by having to have an area to bolt into etc.

I'm already thinking about reducing the size to 50CM from 60CM and having a fixed wing removing the bolt issue. In turn that should give me more space inside which I don't need so a smaller fuselage instead.
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Old Oct 19, 2013, 03:32 PM
Crashing into the sky!
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Auckland NZ
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I strongly suggest you have a look at the other threads in the high performance section for some inspiration as to what actually makes a 200mph plane, or even a 180mph plane.

I admire your perseverance, but the design/build is really not up to the job of going fast. Do some research, rethink the power system, then design a weapon from scratch.

Is it possible your eagletree pitot setup is reading out kmh instead of mph? GPS is not suitable for speed runs as it doesnt refresh its position fast enough to be accurate, some seriously goofy numbers can be spat out.

Sorry, im not trying to dump on your model, but I have a pretty good idea about what it takes, been there done that, Im just suggesting you go through the high performance forum here and have a search, and then do some reading. Search for GPS Vs dopler etc etc have a look at other peoples quests for 200mph and what they used to acheive it. Lots and lots of great information that will make your project more successful.
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Old Oct 19, 2013, 03:36 PM
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My last version did do 180MPH confirmed by EagleTree and yes in MPH, later but on a windier day we clock 160MPH via MyFlyDream OSD + GPS to ground station using GPS ground speed.

I understand your comment and feel this fuselage was just wrong and chunky.
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Old Oct 19, 2013, 05:45 PM
2012 NZ Speedcup - 231 MPH
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New Zealand, Tasman, Richmond
Joined Mar 2006
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If wood gets you going, then take a gander at this bad boy

http://www.rcgroups.com/forums/showthread.php?t=418625

it might give you a few clues. Scaling up one of these a little bit and with the right alterations could get you to 180mph. After 180, you really need to have a very sound design (specialised airfoil, accurately made using CNC etc) and quite a bit of power. Even the best F5D ships which are unquestionably slippery in the air can manage ~200 mph, but on a really low ~1000W.

Remember to double the speed of a plane you need 8x the power, so improvements in airframe become very important as speed and drag increase.
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Old Oct 19, 2013, 05:56 PM
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Thanks for the input.

As I said in the previous post I would like to try a reduced size with a fixed wing, half of the issues I had so far come from having to brace the wing area for bolt and the slot at the front. If I have the wing fixed then I can bond the wing to the fuselage leaving inside a tray without space loss.

I have however (and back when I started) read lots of the threads here naturally

I am mainly trying to push the boat on what is possible using the 450 motor on 3S rather than jumping into big pack sizes and very expensive motor set-ups (which of course would make the entire thing easier - not cheaper).
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