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Author Topic: New LPP  (Read 1053 times)
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Skymon
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« on: March 14, 2018, 04:48:57 AM »

I have recently built a Limited Penny plane.
This was a bit of departure from the lightweight stuff for me.
I wanted to build something my sons might be able to build too.
Turns out only one son was interested and he wanted to build a ministick...

Anyhow, I chose a design called 'Pretty Penny' probably because of the nice curved wings, and I had a go.

It all went together nicely apart from the curved bits. Trying to soak and curve light wood at these thicknesses is not easy.
I got kinks and kinks.
So I gave up and ended up with square ends.

Here it is - I even added a carbon fibre rear post in tribute to Bill and his carbon machines.

I tried to fly it last week and there were a number of issues...
1 - it did a Zoolander on me and refused to turn left, just cruised straight on.
2 - the prop was really badly unbalanced so there was a heck of a wobble.

I have had a go at it since. I added left thrust and more tail offset.
I'm working on the prop balance thing as well, although I'd like to make a new prop.

Regards
S
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New LPP
New LPP
New LPP
New LPP
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cvasecuk
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« Reply #1 on: March 14, 2018, 06:57:10 AM »

I am sure your boy would be able to build a "Kenny Penny", especially if you got a kit from Flitehook. It is worth it for the prop alone!
Ron
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Skymon
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« Reply #2 on: March 14, 2018, 08:54:06 AM »

After his success with the ministick, he's raring to go with a LPP.
I think we'll be doing one of Bills carbon planes.
S
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Olbill
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« Reply #3 on: March 14, 2018, 10:30:29 AM »

It looks nice. I don't see any reason why it wouldn't fly.

If you decide to build mine please make sure you have all 5 of the drawings so you don't go crazy trying to figure out the weird parts.. Also, I'm going to try to work out a better method of attaching the tip plates. When one breaks loose it almost invariably takes the end rib with it. Repairs are very difficult.

One of the most important parts of flying LPP's is using enough rubber and trying to minimize clumps of knots. This has led to my front hook design and the use of spacers on both ends of the motor. Front tangles are almost completely eliminated. Tangles at the rear are still a problem.

I'll post the latest version of the drawings in the Plan Gallery. There are some changes needed so I'll post another note when they are ready.
« Last Edit: March 14, 2018, 10:48:57 AM by Olbill » Logged
Olbill
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« Reply #4 on: March 14, 2018, 02:13:04 PM »

I've submitted the new package to the Plans Gallery and requested that the two old ones be removed. The new one will have "2018 Carbon Penny" in the title.
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dslusarc
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« Reply #5 on: March 14, 2018, 06:49:02 PM »

The one photo looks like the tail has right tilt in it but might be from the photo angle. A photo taken directly in front of the plane might help. I do not know what wire size you used on the  nose bearing but one thing on a wire bearing to notice is how it acts with a rubber band hooked to it, sometimes they look just fine until you hook a rubber loop on then the wire can flex or slop in the bearing can make the side thrust disappear. On the wobbling prop, they generally wobble due to one having more pitch than the other or if the twist is slightly different. They generally do not wobble from weight difference as the RPM is not really fast enough for that.

Don
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Olbill
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« Reply #6 on: March 14, 2018, 08:23:52 PM »

I've submitted the new package to the Plans Gallery and requested that the two old ones be removed. The new one will have "2018 Carbon Penny" in the title.

All done. It's on the first page under "Indoor Duration". Exact title is "2018 Carbon Penny LPP". Lots of little things have been updated.
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Skymon
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« Reply #7 on: March 15, 2018, 03:37:49 AM »

The tail tilt is per the plan, it's not particularly big.
The nose bearing was from .020 gauge wire which was a real pain to bend.
But I think I got a nice form.
I'll check the pitch each side, but it looks pretty similar.
Trimming and tuning is part of the fun.

S
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Skymon
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« Reply #8 on: May 02, 2018, 03:43:13 AM »

So I took the LPP out again last night for some air.
Good news is that it turned and it climbed.
I was pretty happy with it although it was overly close to stalling on power, so needs a small tweak.

But the prop was not good, it was out of balance, either in mass or pitch and it was belting round.
Eventually it battered itself to death on the ceiling and a lone blade floated down to earth before the plane did.

So it's time to build a proper prop.

I'll be reviewing designs in depth Smiley

BR
S

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