bobdabilduh55 Show full post »
e3_Scott
Quote:
So this is some weird $#!+.
I made the ventral stabilizers a bit smaller but I'm lost as to why this is doing this! Bueller.......Bueller.......anyone! Lmao

Peter


Hi Peter -

Sorry your maiden was so short. The behavior I saw on the video reminds me of some experimenting I did with the T50 V1 quite awhile back https://www.rcpowers.com/community/threads/my-rc-powers-t-50-pak-fa-v1-revisited.22134/ I struggled with a few things with that build and flying, but learned a lot.

One of the experiments I tried was moving the motor further forward which pushed quite a bit of the weight forward as well. I did end up with more torque roll issues than I had on my previous T50 V1 build and it seemed to also introduce a "gyroscopic" effect similar to what was happening with your plane just before the incident happened. This was a real issue for me on launch as well until the plane got some serious airflow going over it. I saw sometimes the same thing where the nose would stay in one place and the back end spun around like a top, really a handful. So I don't know if moving the motor back at all would help. I introduced this "gyroscopic" behavior when I moved the motor forward so much on my T50 V1 experiment, otherwise everything else was quite similar between it and my first build other than weight and build materials.

Good luck

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
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homey666
Thanks guys. I'll make the stabilizers bigger and move the motor back an inch and see what happens! Always good stuff here.

Peter
YouTube Channel

flower666able
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bobdabilduh55
Quote:
So this is some weird $#!+.
I made the ventral stabilizers a bit smaller but I'm lost as to why this is doing this! Bueller.......Bueller.......anyone! Lmao

Peter


It’s not a good idea to reduce the size of the ventral vertical stabilizers. I experimented with the V2’s VVS size, projection and shape to get the smallest fins that would still work. What you experienced was a loss of directional stability. If you view my early vids of the v2 design you see the same behavior when her fins where to small. Moving the motor will not work. Make the VVS per the plan and she will fly.
"Five Easy Pieces"
WATT FLYER Forum's 2012 Scratch-Builder Award Winner
(For Posting outstanding scratch building threads on Wattflyer)
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homey666
Quote:
It’s not a good idea to reduce the size of the ventral vertical stabilizers. I experimented with the V2’s VVS size, projection and shape to get the smallest fins that would still work. What you experienced was a loss of directional stability. If you view my early vids of the v2 design you see the same behavior when her fins where to small. Moving the motor will not work. Make the VVS per the plan and she will fly.

Beauty, will do! Thanks Bob.

Peter
YouTube Channel

flower666able
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JTiger
Quote:
So this is some weird $#!+.
I made the ventral stabilizers a bit smaller but I'm lost as to why this is doing this! Bueller.......Bueller.......anyone! Lmao

Peter



Since there aren't any major vertical stabilizers, it seems to have flown like a big frisbee with an offset CoG. A flat spin but sideways.
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homey666
K, ventral stabs as per plans. You can see the size I had them before, thus the frisbee flight last night! Might give it another try tomorrow! Great fun.

Peter

20180626_221114.jpg 
YouTube Channel

flower666able
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JTiger
The split elevon concept could be something worth playing with. It's the same thing Dave used on the old X-36 on YouTube. The only difficulty might be that your TE is swept forward and not back like the X-36 or B-2.

https://rcpowers.com/community/threads/split-elevons-duckerons-quak.3691/
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homey666
Quote:
The split elevon concept could be something worth playing with. It's the same thing Dave used on the old X-36 on YouTube. The only difficulty might be that your TE is swept forward and not back like the X-36 or B-2.

https://rcpowers.com/community/threads/split-elevons-duckerons-quak.3691/

Yes, might have to make that a winter project. Tried again tonight with the proper sized stabs and new nose and it did the exact same thing. Maybe cg is off, maybe there's some warping I'm not seeing. No harm no foul!

Peter
YouTube Channel

flower666able
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Wildthing
Quote:
Yes, might have to make that a winter project. Tried again tonight with the proper sized stabs and new nose and it did the exact same thing. Maybe cg is off, maybe there's some warping I'm not seeing. No harm no foul!

Peter

Find some tall grass and glide test it without power, should be able to come up with a very close cg.
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bobdabilduh55
Quote:
Yes, might have to make that a winter project. Tried again tonight with the proper sized stabs and new nose and it did the exact same thing. Maybe cg is off, maybe there's some warping I'm not seeing. No harm no foul!

Peter

I found my model but it had no CG marked either. I did note that i placed the 1300 - 1600 mph battery at the point where the LERX meet the fuse. I have a 3mm CR there that i could strap the battery to.
Try this battery location and glide test her like WILDTHING mentioned and see if that corrects her directional stability.
"Five Easy Pieces"
WATT FLYER Forum's 2012 Scratch-Builder Award Winner
(For Posting outstanding scratch building threads on Wattflyer)
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