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Yellow Aircraft Stingray

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Yellow Aircraft Stingray

Old 10-19-2019, 01:29 PM
  #51  
Signofinfinity
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Better it climbs on power then duck under ...

I might add a few degrees. But I will wait if you can come up with any info.

For sure it needs reflex for takeoff... So, upthrust can only be good.
It seems she ducks under in turns too, signs of no up thrust. Me thinks.
Old 10-19-2019, 01:30 PM
  #52  
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Originally Posted by CARS II View Post
Giving up thrust will help any time, you get to find the effects during flight, when it is going faster it wants to climb a bit then you push the Elevons down a bit then back to normal cruise speed ( 2/3 throttle ) all is back to normal trim.

These tailess airplanes are a diferent animals and your Stingray will fly a bit different than mine or my friend's, but it will fly and scare the pants off you

Thanks for the encouragement!!! Haha😁😁🤞🤞🤞
Old 10-19-2019, 02:05 PM
  #53  
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Don't recall on the ducking, only flights under your belt will tell what she needs.
Old 10-19-2019, 02:14 PM
  #54  
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This is the bracket I made for the brake valve on my Reaction 54, you get the idea.
Old 10-19-2019, 03:20 PM
  #55  
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I would abandon that mount and go to the tab and strap type. BVM makes them (it used to make them). As you suspected you want the thrust line much lower.

I ran maybe 1/8 inch reflex but I don't remember exactly how much. Your speed brake rigging looks perfect BTW.

FWIW
Old 10-19-2019, 04:47 PM
  #56  
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Here is what my friend said and I agreed on the suggestion of the mount from BVM, I used that mount, the more precise you build it the easier it will be to fly, I also agreed on 1/8 reflex up to start with.

On my Kangaroo I took half of the reflex up today, that's after 3 flights, it will take around 6 flights to get all dieled in.

Last edited by CARS II; 10-19-2019 at 04:56 PM.
Old 10-20-2019, 12:40 AM
  #57  
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Thanks all for the input!
So I got working this morning. Swapped everything over., Egt, fuel /tach wiring...

Everything swapped top side ..


Can't get lower than this....


Now, how do the BVM mounts look like?... Need to figure the next bit out.
Old 10-20-2019, 12:41 AM
  #58  
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Originally Posted by CARS II View Post

Here is what my friend said and I agreed on the suggestion of the mount from BVM, I used that mount, the more precise you build it the easier it will be to fly, I also agreed on 1/8 reflex up to start with.

On my Kangaroo I took half of the reflex up today, that's after 3 flights, it will take around 6 flights to get all dieled in.
Thanks for that! One issue less!
Old 10-20-2019, 12:45 AM
  #59  
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Something of the sort... Using 1.5mm or 2mm Aluminium... Tabs to be bent to the fuse profile...
Originally Posted by mr_matt View Post
I would abandon that mount and go to the tab and strap type. BVM makes them (it used to make them). As you suspected you want the thrust line much lower.

I ran maybe 1/8 inch reflex but I don't remember exactly how much. Your speed brake rigging looks perfect BTW.

FWIW
Thanks for that! I will Google some pictures of the BVM mounts...
I believe thrust line should be close to the longitudinal axis to avoid pitch moments ... Tell that to the 738Max, and our 320neos!😁😁😁

​​​​​​I will have to fabricate something to make it fit!

Thanks!

​​​​​

Last edited by Signofinfinity; 10-20-2019 at 01:00 AM.
Old 10-20-2019, 10:05 AM
  #60  
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Looks good! The mount that you made first is very close to what you need to make now, just smaller to keep the engine in the packet.

I beleave you'll have it ready in no time now.
Old 10-20-2019, 12:00 PM
  #61  
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https://shopbvmjets.com/index.php?main_page=index&cPath=107_110&zenid=chq0v86aseies5vrb1u90sofl2

Just need to find an engine same diameter as yours. If you can't find straps that work you just need the mounting ears and some large hose clamps.
Old 10-22-2019, 03:50 AM
  #62  
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Default Update... Was flying all over Europe yesterday! Some work this morning...



Will use the glow plug as an anti rotation pin..



Any lower... And good bolt touches..


Decent?


Left side thust..18.4cm


A parallel with the mold line.. engine has just the planned 2 degrees upthrust


Right side thrust...18.4cm


The mold line vrs longitudinal axis of engine... About 2 degrees cone up
Old 10-22-2019, 03:51 AM
  #63  
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Straps.... Old iPad cover!! The metal straps within!

I might re do them in aluminium or just leave them straps!
Old 10-22-2019, 04:00 AM
  #64  
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Default Retracts...

Ok, last question to you guys in the know.

Attached is screen shot of what I am ordering from Robart.

Being in the US, and lack of availability, can some one double check I am placing the correct order?

Am planning to install a mini servo for the nose wheel...I hate pull pull....and get the suggested wire nose leg.

Makes sense? Robart confirmed just a trunion reversal... Servo bracket? No pull pull. Wire leg? Looks horrible.... Strut better but not recommended?


Or should I get the robo strut two wheels???

Thanks a million for the support guys! Appreciated!

Last edited by Signofinfinity; 10-22-2019 at 04:02 AM.
Old 10-22-2019, 07:43 AM
  #65  
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I believe these are the Stingray's retracts and struts, they are Springair, air up/spring down retracts and struts, no main wheels with brakes wheels.

Last edited by CARS II; 10-22-2019 at 08:01 AM.
Old 10-22-2019, 08:00 AM
  #66  
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The engine looks at home now, nice work, I would go with that mount, all straps now days don't have an anti-rotational glow plug hole, not really needed, engines don't move around, they move forward if the airplane suddenly comes to a complete stop.

Last edited by CARS II; 10-22-2019 at 08:08 AM.
Old 10-22-2019, 10:10 AM
  #67  
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Originally Posted by CARS II View Post
The engine looks at home now, nice work, I would go with that mount, all straps now days don't have an anti-rotational glow plug hole, not really needed, engines don't move around, they move forward if the airplane suddenly comes to a complete stop.
Thanks.. haha yes indeed! Engines go forward in the event of a dead stop stop!
Old 10-22-2019, 10:12 AM
  #68  
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[QUOTE=CARS II;1255830
I believe these are the Stingray's retracts and struts, they are Springair, air up/spring down retracts and struts, no main wheels with brakes wheels.[/QUOTE]


Thanks. I will check with the robart equivalent. I have the original Funky retracts... But, they are tooooo soft!!
Old 10-22-2019, 10:15 AM
  #69  
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Old 10-22-2019, 10:59 AM
  #70  
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FWIW I used the stock retracts for a long time (with old bvm struts), they actually have some nice features, but I did eventually switch to robart. I can't remember which part number but the ones you have listed look right. At the same time I switched I put on some modified prolink trailing link main struts. I used the same bvm wheels and brakes with the trailing link.

I did keep the funkey nose gear though. I ran a twin nosewheel with bvm straight strut
Old 10-22-2019, 11:22 PM
  #71  
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Originally Posted by mr_matt View Post
FWIW I used the stock retracts for a long time (with old bvm struts), they actually have some nice features, but I did eventually switch to robart. I can't remember which part number but the ones you have listed look right. At the same time I switched I put on some modified prolink trailing link main struts. I used the same bvm wheels and brakes with the trailing link.

I did keep the funkey nose gear though. I ran a twin nosewheel with bvm straight strut
Thank you. May I ask which prolink legs did you use?
Old 10-23-2019, 09:40 AM
  #72  
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So, one stupid question....

Anyone use a 3/8 robo strut for the nose???
I want to order the servo plate too to remove pull pull.

But... How the heck do the 3/8 robo strut get hooked up on a nose wheel retract?

Can I use the servo plate with a robostrut at all??

https://robart.com/products/550sbd-steering-servo-mounting-bracket-mini-servo-7-16-strut-1-4-axle



Servo.. gear up..32mm


Servo.. gear in transit..32mm


Servo.. gear down..32mm
Old 10-23-2019, 09:53 AM
  #73  
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Default Small update engine mount.

The plates add the pressure to lock the turbine.
Old 10-23-2019, 10:13 AM
  #74  
CARS II
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They come ( I think ) with a sleeve to increase the OD to 1/2" and an insert so it can be use with the retract's pin that it comes with which happens to be the thickness of the wire strut, we usually JB weld the insert into the strut then drill a hole and tap it, that screw will secure it to the pin, you could use two set screws if you like.

Last edited by CARS II; 10-23-2019 at 10:20 AM.
Old 10-23-2019, 10:17 AM
  #75  
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Originally Posted by CARS II View Post
They come ( I think ) with a sleeve to increase the OD to 1/2" and an insert so it can be use with the retract's pin that it comes with.
Am with Danny of customer care. He is great answering questions. He is checking. The 550retract come with a 7/16 bore, and an extra adapter to down the diameter to 3/8.

The servo plate comes with the 7/16 dowel to fit in the retract... But the center hole is 1/4!!! So how does the 3/8 strut be used for nosewheel???

Head scratching. Am sure someone must have used a 3/8 robostrut for nose wheel. 1/4 pin perhaps??

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