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Author Topic: First p30  (Read 1548 times)
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Mikek
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« on: December 09, 2017, 12:22:18 AM »

Just finished my first p30 last weekend, a Hot Box by John Oldenkamp. Came in at 46 g without the rubber. Flew off the board! Only had to add a bit more right thrust and some stab tilt to get a right/right pattern. Don’t have a big enough field to fully wind it up. Taking it to Southwest Regionals in January to see what it can do.will definitely put a DT on it!
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First p30
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DerekMc
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« Reply #1 on: December 09, 2017, 12:25:52 AM »

Way Cool! 
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Derek
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« Reply #2 on: December 09, 2017, 07:50:32 AM »

Mike!!

Nice model. PUT A DT ON IT NOW!!!  Or you will lose it even on a low winds test flight and never make it to the contest.

Don't bother to ask how I know.
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billdennis747
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« Reply #3 on: December 09, 2017, 08:27:52 AM »

A question. How do you get safe R/R trim on a model with straight dihedral? Doesn't R/R involve some 'right inner panel washin'?
Bill
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Mikek
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« Reply #4 on: December 09, 2017, 09:02:39 AM »

Bill
Just have built in down and right thrust as per the plan and slight stab tilt ( right side of stab up 1/32 inch). Have 3/32 washout on both wing tips, also per the plan. John Oldenkamp’s original article describes right/right pattern.
Admittedly have only done low power test fights so far so I don’t know if it will start going left under higher torque or not.
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danberry
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« Reply #5 on: December 09, 2017, 11:32:40 AM »

A question. How do you get safe R/R trim on a model with straight dihedral? Doesn't R/R involve some 'right inner panel washin'?
Bill

You want wash-in on the wing to the inside of the glide turn.
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danberry
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« Reply #6 on: December 09, 2017, 11:35:40 AM »

Bill
Just have built in down and right thrust as per the plan and slight stab tilt ( right side of stab up 1/32 inch). Have 3/32 washout on both wing tips, also per the plan. John Oldenkamp’s original article describes right/right pattern.
Admittedly have only done low power test fights so far so I don’t know if it will start going left under higher torque or not.

You should be good to go.
Are you using a 6 strand motor?

I did  notice that you have the all-important white fin in use.
I don't see any address labels. Wing, stab and fuselage all want labels that have your cel number.
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vintagemike
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« Reply #7 on: December 09, 2017, 12:59:38 PM »

Or wash out on the outside wing
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Mikek
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« Reply #8 on: December 09, 2017, 02:51:52 PM »

Good advice from all. Already have had two models go OOS this year. One was a Condor, built using plans from Don Ross’s book about building rubber models. The other was an FAC Moth. Both had button timers and pop up tails which I swear I set before they flew away!
Lesson: bring binoculars! Switch to pop off wings?
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DerekMc
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« Reply #9 on: December 09, 2017, 02:56:36 PM »

Switch to pop off wings?

They work well and are worth it for light models.
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Derek
TimWescott
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« Reply #10 on: December 10, 2017, 06:22:35 PM »

I would not want a model that just flew right off the board.  Because I have rafters in my workshop that would probably eat the thing.

Just sayin'
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Pat D
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« Reply #11 on: December 14, 2017, 04:06:02 AM »

Would pop off wings for a DT be suitable for a coupe sized model ?

Pat

Switch to pop off wings?

They work well and are worth it for light models.

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DerekMc
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« Reply #12 on: December 14, 2017, 11:34:29 AM »

I've never seen a coupe with a pop off wing. I wouldn't do it myself. The best DT for Coupe I've seen is to pop up the front of the wing and the back of the stab. Works great for Tyfanney O'Dell. She is a multiple winner of the Americas Cup in Coupe.
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Mikek
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« Reply #13 on: December 19, 2017, 08:39:39 PM »

I’m being good and leaving my p-30 in the shop until my viscous timer arrives in the mail!
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Mikek
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« Reply #14 on: December 30, 2017, 10:13:07 PM »

Added DT as recommended!

Got a 2 minute flight today on 6 strands of 1/8 at a torque of 4 inch ounces on my uncalibrated torque meter. Was afraid to try a higher torque after that. Looks like it has potential!
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Re: First p30
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Mikek
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« Reply #15 on: January 14, 2018, 09:39:36 PM »

Flew the Hot Box at Southwest Regionals yesterday. Did 112, 119, and 120 sec! Not good enough to place but I was thrilled to have one max!


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OZPAF
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« Reply #16 on: January 15, 2018, 01:03:10 AM »

Congratulations - a really nice build. Did you add any wash in on the right wing panel finally BTW?

Jean Wiesenriether (author of PGI and TOP trim methods) never used it for his very successful right/right coupes. He achieved a balance between motor torque and rudder size  to keep the inside climb wing up.

I'm just curious as it seems John Oldenkamp may have done something similar.

good luck with it - happy flying.

John
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Mikek
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« Reply #17 on: January 15, 2018, 08:59:00 AM »

Ozpaf

Just built in equal washout of 3/32 on each wing tip, 1/16 washout on each stab tip, down and right thrust all according to plan.
Tilted the stab 1/16 to get right glide.

Maybe I just got lucky or there are some subtle warps I can’t see! It sure flies nicely!
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