Re: Scientific "Zipper" Build...Zipper Flys!.

rsv1cox Mon Jul 22, 2024 6:28 pm

Ah, rafter hangers Kim. Love it. Good to see the Little Traveler again.

The Little Tom Tom isn't so little. I like the hard angles.

Kim Mon Jul 22, 2024 7:08 pm

rsv1cox wrote:Ah, rafter hangers Kim. Love it. Good to see the Little Traveler again.

The Little Tom Tom isn't so little. I like the hard angles.

Thanks Bob!

The rafters were getting full in the shed AND the shop, so I've gotten another portable building to let stuff expand!

The angles ARE a lot sharper than those of the Scout...and I almost tried to build up another one back in the day, but had to be REAL strategic with the lawn mower / paper route funds!
Even so...there were no more second hand paints used!!!!!

Kim Thu Jul 25, 2024 4:31 am

July 24th, 2024

So, Zipper got its first flight in the front yard. After a failed first attempt, which had it running off its foam board runway, we regrouped and put in a fine first flight.

As is my custom, the elevator was a bit touchy, and needs to be tuned down (done), and the nose gear needed a bit of outward bend to keep the lines tight...though how much "grip" its wooden wheels have on its runway is questionable. So, I'm gonna scrounge through the prop box and see if I can find a reverse pitch 6x3 to help quell the massive torque coming from the Babe Bee.

Otherwise, we're good. Unfortunately, I seem to have a shortage of energy here lately, and didn't feel like attempting another flight in this heat.

Everything is on standby, and I hope to get much better video of its next flights...this one was pretty shaky.

https://youtu.be/d8gHbWCdNco

Scientific "Zipper" Build...Zipper Flys!. - Page 4 200_38

Scientific "Zipper" Build...Zipper Flys!. - Page 4 Dsc_0251

Scientific "Zipper" Build...Zipper Flys!. - Page 4 100_68

Scientific "Zipper" Build...Zipper Flys!. - Page 4 Dsc_0252

Mike1484 Thu Jul 25, 2024 9:10 am

Well done Kim! The plane looks super great in the air. Thanks for sharing the video and we wish you many more happy flights on your new bird.
Mike1484 Very Happy

**944_Jim** Thu Jul 25, 2024 9:13 am

Wow, Kim...beautiful in the air! That Landing is why I fly over concrete.

rdw777 Thu Jul 25, 2024 9:50 am

Congratulations on nice first flight Kim….Looked very smooth for a sensitive elevator….Looks like its sleek design really lets it move out on Bee power!!

Kim Thu Jul 25, 2024 10:34 am

Thank You Guys!!!!!!

Yeah, didn't care for the landing, so I may hoof it over to the ramp at the Cairo airport for its next set of flights.

My ideal nostalgia choice would be to fly it at the ball field in my hometown where my first Zipper flew back in the 60's, but the ball diamond was converted to a soccer field years ago, so the infield is gone.

Either way, gonna try to have a lot more video coverage of its next outing.

akjgardner Thu Jul 25, 2024 11:12 am

Nice flight Kim , what did the airplane weigh and what was the engine ?

balogh Thu Jul 25, 2024 11:39 am

Beautiful model Kim, and very stable flight, congratulations!

Kim Thu Jul 25, 2024 12:28 pm

akjgardner wrote:Nice flight Kim , what did the airplane weigh and what was the engine ?

I just KNEW someone was gonna ask me that! So, out comes the postal scales, and here are the stats for +10% Zipper!

+10% Zipper Stats:

Length: 16 1/2"
Wingspan: 20 1/4"
Root Rib Chord: 4 3/4"
Tip Rib Chord: 2 1/8"
Weight: 6.4 oz

Engine:
Classic Babe Bee .049 w/ 6cc integral tank
Single Bypass #2 Cylinder with SPI
Cox 6x3 black prop

Flying on 35' of 30lb "Spider Wire"
Using 25% Sig Champion Fuel

akjgardner Thu Jul 25, 2024 12:59 pm

Kim wrote:
akjgardner wrote:Nice flight Kim , what did the airplane weigh and what was the engine ?

I just KNEW someone was gonna ask me that! So, out comes the postal scales, and here are the stats for +10% Zipper!

+10% Zipper Stats:

Length: 16 1/2"
Wingspan: 20 1/4"
Root Rib Chord: 4 3/4"
Tip Rib Chord: 2 1/8"
Weight: 6.4 oz

Engine:
Classic Babe Bee .049 w/ 6cc integral tank
Single Bypass #2 Cylinder with SPI
Cox 6x3 black prop

Flying on 35' of 30lb "Spider Wire"
Using 25% Sig Champion Fuel

. Cool , Thanks

GallopingGhostler Thu Jul 25, 2024 8:36 pm

Nice flight report, Kim. Just curious, but perhaps reason for a tad down elevator required is due to engine at 0 incidence and wing's modified Clark-Y with upper surface foiled for more lift?

For C/L, I've preferred the neutral boyancy of the symmetrical airfoils and solid balsa "flat plate" airfoils. Popcorn

Again, nice flight, brings back good memories. This Site Rocks!

Kim Fri Jul 26, 2024 4:22 am

GallopingGhostler wrote:Nice flight report, Kim. Just curious, but perhaps reason for a tad down elevator required is due to engine at 0 incidence and wing's modified Clark-Y with upper surface foiled for more lift?

For C/L, I've preferred the neutral boyancy of the symmetrical airfoils and solid balsa "flat plate" airfoils.

Again, nice flight, brings back good memories.

Hey Thanks George!

Yes, for sure, flat plate and symmetrical airfoils always perform better. The flat-bottomed airfoil on Zipper adds a bunch of lift that has to be countered, but I'd figure that some negative engine incidence would have it chasing pitch when the engine quit. So...I just went for a mid-to-low-power Babe Bee, and it's all a Nostalgia Build anyway.

Facebook Friend, Paul Smith, posted this on my page, his has the bellcrank moved to the top of the wing, and looks to have a Tee Dee .020 for power:

"I have one of those. Built from a kit that was bungled and abandoned. Mine has been "ready-to-fly" for 12 years now."

Scientific "Zipper" Build...Zipper Flys!. - Page 4 Paul_s10

getback Fri Jul 26, 2024 7:27 am

Hey that's a beauty too !! Thanks for the stats I was wondering what the WS and L was , and running a 6X4 on a Bee single port !Man that thing was humping it around the circle Very Happy

Thanks for the FUN ! This Site Rocks!

Sponsored content