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Author Topic: Pemby's Kid Build  (Read 2971 times)
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SHigSpeed
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« on: March 08, 2012, 01:33:09 AM »

Hi All,

I'm relatively new here, and just getting back into building stick and tissue FF planes.

I built and posted up about a Javelin a bit ago, and wanted something for smaller fields but higher in performance than the Guillow's.

I looked around at a lot of designs and an embryo seemed just the thing.  I considered a Minihobbies, but it was about the same size as the Javelin.  I'm dead set on building a Senator, but that's too big and I feel like I need to ease into things.

Then I saw and did some research into the Pemby's Kid plans.  Seems like a sweet little flyer and there are a few good videos online showing its potential.

Anyway, I'm almost done with the bones.  At about 8-8.5 grams now with all that's left is a prop and noseblock (and covering of course).

Photos:
http://farm8.staticflickr.com/7044/6817482380_3ded338981_b_d.jpg

and its Ruby Slippers:

http://farm8.staticflickr.com/7206/6817482768_ee2012a9b0_b_d.jpg

Can anyone tell me what a reasonable target for weight on this design should be?  I'm using luck of the draw Midwest balsa, but anything has gotta be better than Guillow's wood, right?

Also, I have some Esaki on order from Shorty's, but they're turnaround has been SLOOOW and I really wanted to cover the plane this weekend.  I did the math and think the domestic paper would only add about 0.6 grams to this model.  Worth waiting for?  Hmm...

I'm planning on using a Peck 7" prop and probably a single loop of 3/16" unless anyone else has a better suggestion.  No, I haven't carved balsa props yet so that's out of the question.  A yogurt prop - maybe. 

Thanks!

_SHig
Pemby's Kid Build
Pemby's Kid Build
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Yak 52
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Jon Whitmore



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« Reply #1 on: March 08, 2012, 02:28:16 PM »

Can anyone tell me what a reasonable target for weight on this design should be?

Hi SHig. The glib answer would be the lighter the better!  Grin But the (very) rough rule of thumb is 0.5g per square inch (or less for smaller models). So an Embryo with 50in2 would fly ok at 25g. But 15-20g would be a lot better. Some guys are flying Embryos much lighter still - and getting good times as a result.

By covering and adding the prop you are likely to double the weight of the bones so 16-17g should be possible?


Jon
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SHigSpeed
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« Reply #2 on: March 11, 2012, 03:34:41 AM »

Well, all I have left to cover are the wing endplates.  To finish things off I'll need to make the canopy.

Still need to shrink and spray, but I think it's turning out pretty good.

The plans call for dowels and magnets to retain the nose, but I went this route as I didn't have any magnets to use:

http://farm8.staticflickr.com/7042/6971740019_27007cc89a_b_d.jpg

...and the plane propped together:

http://farm8.staticflickr.com/7068/6971741483_81844a093d_b_d.jpg

http://farm8.staticflickr.com/7197/6971741763_70ea8e2100_b_d.jpg

Might get a chance to finish it up tomorrow.  Supposed to be windy and rainy here, but I may be able to swing a gym to do some indoor trimming in.

_SHig
Pemby's Kid Build
Pemby's Kid Build
Pemby's Kid Build
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dputt7
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« Reply #3 on: March 11, 2012, 04:32:43 AM »

Hi
Very neat, nice work.
regards Dave
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Yak 52
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« Reply #4 on: March 11, 2012, 08:52:13 AM »

Looks good!
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SHigSpeed
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« Reply #5 on: March 11, 2012, 07:11:04 PM »

Bit more progress.  Shrunk and sprayed.  This is the tightest I've ever managed to get a covering.  Learning a lot of good info here and it's helping a ton!

Weight without "glass" or rubber but with prop came in at 17.5 g.  Surprisingly the CG was at about 15% from the leading edge.  I was afraid it was going to be more nose heavy.  With a loop of Guillows white rubber it balances just about right at 30-35% or so.  A quick few winds shows real potential but flying in the street in gusty winds is tempting fate.  Already took a cartwheel on the asphalt - EEK!

Latest photos:

http://farm8.staticflickr.com/7180/6974161121_f57c025ebd_b_d.jpg

http://farm8.staticflickr.com/7036/6828040658_f9542f88d2_b_d.jpg

Maybe I'll get the glass done tonight.  Can't wait to get a chance to go more winds over grass or hardwood.

_SHig
Pemby's Kid Build
Pemby's Kid Build
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Dave Andreski
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« Reply #6 on: March 11, 2012, 07:29:06 PM »

Nice looking Model.
Please be careful when flying out in the street. Be patient.
Dave Andreski
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SHigSpeed
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« Reply #7 on: March 12, 2012, 12:50:47 AM »

Nice looking Model.
Please be careful when flying out in the street. Be patient.
Dave Andreski

Thanks!  It's so tough to be patient when you have a new toy though. Wink

I finally finished up the canopy.  I printed one up blacked out, but I like the outline version better.  Added like 0.3 grams though.

Not sure if anyone has done this, but I pierced two straps of 3/16" rubber to make the wing lashes. I also used the wing lash posts to hold the canopy glass on so no messy glue.  I think it should work out okay.

Also, on the tail I used a tab in slot at the front and a similar rubber strap, though for this one a simple small dental band would do as well (though I don't have any handy...).

Pics:

http://farm8.staticflickr.com/7061/6975077593_2b157d345a_b_d.jpg

http://farm8.staticflickr.com/7068/6828953346_8e110e050c_b_d.jpg

http://farm8.staticflickr.com/7054/6828953850_0d4f438874_b_d.jpg

Enjoy!

_SHig
Pemby's Kid Build
Pemby's Kid Build
Pemby's Kid Build
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outofbalance
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« Reply #8 on: March 12, 2012, 10:48:27 AM »

Hi Shig:

I'm trying to imagine how good your models are going to be with some more experience.  Very talented craftmenship on Pemby's Kid.  Is this a Bill Brown design?  He was one of my favorite designers and his designs fly great.

Outofbalance
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SHigSpeed
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« Reply #9 on: March 12, 2012, 12:37:11 PM »

Hi Shig:

I'm trying to imagine how good your models are going to be with some more experience.  Very talented craftmenship on Pemby's Kid.  Is this a Bill Brown design?  He was one of my favorite designers and his designs fly great.

Outofbalance

Thanks for the kind words.  Yes, this is a Brown design.

I shaved a few tenths of a gram off of the 7" Peck prop with a straight razor this morning and swapped the crappy Guillow's white rubber with a loop of 1/8" tan and now I can get a decent amount of turns on the motor.  Built a blast tube for it and need to figure out some sort of stooge.  For now I have a dry cleaner wire hanger modified to be a "step stooge" but I can' really pull much stretch on it while cranking.  It now balances at about 50% wing chord and I thing it should glide better now.  No CG marking on the plans BTW.

Again tempting fate I wound the thing to 1000 turns to see how long a "burn" that would give me.  After 40 seconds of so I went outside and did a walk beside flight with the remaining winds down the street and it maintained altitude well and pretty stably (before the prop shave).  Damn I can't wait to let 'er loose with a proper turning trim!

I think I may have cracked a longeron behind the peg by holding the model with my feet and winding as I managed to crush it while simply handling it.  The tissue is holding it together, but it'll have to be repaired at some point. Sad

Hope to get some vids soon!

_SHig
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SHigSpeed
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« Reply #10 on: March 12, 2012, 07:45:17 PM »

Went out with the boys to launch some CLGs and the new Pemby.  Unfortunately it was a bit breezy, but I figured I had to at least get one flight done and on video.

Put about 400 turns on the 1/8" rubber and added a small post-it trim tab on the rudder and let fly.  Tough it bounced around a bit, it did take to the air okay.

Go here for vid:

http://www.youtube.com/watch?v=1GFCUl8b4Ow

The nose block is giving me fits though, or doesn't fit perhaps?  May. Have to put a rubber keeper on it...

_SHig
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SHigSpeed
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« Reply #11 on: March 18, 2012, 03:02:24 PM »

Finally got to a gym to do some flying.  Looks like I need some more trimming for this small area!  Gotta learn the subtleties of outer wing washout as the death spiral eared its ugly head when I tried to tighten things up.

Vid:

http://www.youtube.com/watch?v=LHEGwA7TlXw

Took on some damage from the wall beatings, but it's fixable...

_SHig
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SHigSpeed
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« Reply #12 on: March 22, 2012, 12:14:50 AM »

Did some repair work on the 'Kid tonight. 

Reworked the nose block with something more bulletproof:

http://farm7.staticflickr.com/6221/6858755566_64da1dd48f_c_d.jpg

And switched it up to a shaved and balanced Peck 6" prop instead.  Dropped my AUW from 22 or so down to 19.5 grams.  To top things off, the CG moved rearward enough that I could lose my lump of bluetack out back and now I think she'll fly with no ballast anywhere.

http://farm7.staticflickr.com/6211/6858756058_4220521415_c_d.jpg

Still running an 1/8" motor, 1.5x hook to peg or so.

Can't wait to take 'er out for another trimming session!

_SHig
Pemby's Kid Build
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Sky9pilot
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« Reply #13 on: April 02, 2012, 12:05:16 AM »

Very Nice Work...great looking model...Well Done... Cool

Tom
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SHigSpeed
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« Reply #14 on: April 02, 2012, 01:06:48 AM »

Very Nice Work...great looking model...Well Done... Cool

Tom

Thanks!  I still have yet to get a good flying session on it (indoors or out) but hope to soon.

Since posting last, I've shortened the LG a bit as it looked a bit stilted even though it was bent up to the plan.

New photos:

http://farm7.staticflickr.com/6230/7037700351_3c37884a6a_b_d.jpg

http://farm7.staticflickr.com/6236/6891605496_3a29b4ed3c_b_d.jpg

I really need to recover that nose block now...

_SHig
Pemby's Kid Build
Pemby's Kid Build
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Dimeflyer
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« Reply #15 on: April 17, 2012, 02:22:42 PM »

Nice job on the Pemby SHS !!
Bill Brown was one of the two people that got me interested in the forums and was my main mentor / friend till he passed !!!!!!
George
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duckhunter
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« Reply #16 on: July 19, 2012, 04:22:51 PM »

Very nice im really just starting out but iv built 5 in three yrs LOL . its a time thing, but i love the embryo type planes and yours looks great i hope she flys as good as she looks. duckhunter
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« Reply #17 on: August 07, 2012, 08:04:44 AM »

SHig,

Nice to see how you've helped so many of us remember what a good designer Bill Brown was with your Pemby's Kid build. I like the videos too. Good on you and your camera person!

Outofbalance
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