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Author Topic: Lucky air/lost Lawn Dartie  (Read 1406 times)
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VictorY
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« Reply #25 on: March 08, 2019, 09:58:09 AM »



I don't believe the plan was ever stored here.


Could be. I just know that the pdf I have is in a folder full of other plans from the gallery here.
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VictorY
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« Reply #26 on: March 08, 2019, 09:58:27 AM »



I don't believe the plan was ever stored here.


Could be. I just know that the pdf I have is in a folder full of other plans from the gallery here.
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KingDelta5
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« Reply #27 on: March 08, 2019, 10:10:09 PM »

This is the Lawn Dart Smiley
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KingDelta5
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« Reply #28 on: March 08, 2019, 10:12:23 PM »

The bigger brother
the Lawn Dart Smiley
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FF Bruce
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« Reply #29 on: March 08, 2019, 10:35:27 PM »

King very nice, can't tell you how many of those Marty and I have lost. Marty would change the Lawn Dart a little each year. The first one was built in 1973 before we had CLG. I made one to show how high they could go. My friend Larry Norvall would yell "Lawn Dart" every time I launched it. (sorta like yelling fore at golf) the name stuck. Most didn't have a clue where it went after a launch, they are so fast. I once let my wife fly it, first flight 20 min. and I got it back . She tried again this time 15 min. got it back again. I asked her if she would like to try it one more time, no she said you are gone to long. 
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KingDelta5
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« Reply #30 on: March 08, 2019, 11:06:01 PM »

FF Bruce
I can tell this is a bird not to get too attached to
with out a DT for sure !
The glue is not dry on this on yet !
just built it
Anyway TNX and Best to you Smiley
This Topic was started by VictorY
Credit is due him in as far as I am concerned !
There seems to be only one problem with these darts
Do not become attached Smiley
cheerio
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KingDelta5
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« Reply #31 on: March 08, 2019, 11:42:37 PM »

better pictures
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KingDelta5
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« Reply #32 on: March 12, 2019, 04:11:28 PM »

I lost my dart today
Not long after got it trimmed up and flying good
Wind was blowing just a bit hard for flying
The wind slacked off so I let it go
and that was that !
I did get a chance to watch it fly a bit longer !

At this point

I wonder how much fun this catapult glider stuff really is !

More building than flying

I wonder what would happen if a fella
were to use micro single channel rudder only RC
There are some awful small batteries rx`s and servos now
Cheap too
I know nothing about nothing but I do believe thermal conditions pretty good  now
Cool last nite then the sun beating down on moist ground !

I once wondered how hard it would be to build a solid balsa glider that you could lose
I think now to do that is not hard !

To sum this up !
Both the lawn Dartie and the lawn Dart
Are easy to build and to lose !
Even for a idiot like me !

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VictorY
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« Reply #33 on: March 12, 2019, 06:33:52 PM »

Hmmm. Last post didn't work. I'll try again.

Use a DT device as recommended.
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VictorY
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« Reply #34 on: March 12, 2019, 06:43:22 PM »

And while on the discussion of losing planes easily, you said you waited for the wind to drop when you launched. That was likely a thermal coming through. If a thermal is coming directly at you, the wind either stays in the same direction but drops in speed, or stops completely and is accompanied by a temperature increase. If you launch right at that moment, you are going to lose a trimmed plane with no DT. You can even tell if the thermal is passing on the left or the right if you know how to read the indicators people have erected to help them read the wind.
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FF Bruce
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« Reply #35 on: March 12, 2019, 08:35:43 PM »

Yes we lost a lot of CLG 's until we added a D\T.  Marty and I tried a couple different types and for awhile found if you wanted to screw up a good glider put a D\T on it. Until we started using the one Victor posted. There is the carbon fuselage one but they had not invented  yet, but now are available, weight more are costly and you need a bigger glider to handle the extra weight. We found the pop can type D\T to be the answer for us. We can make the timer at a very low cost and boy does it bring down the plane. Gave a whole new meaning to the name Lawn Dart. They come down absolutely vertical. I've had them go off at 1000 feet and the glider will be on the ground in a few seconds. Many told us that it brakes the model but in 17 years and hundreds of D\T's we never broke a single plane. Why, my guess is the weight of our gliders and the type of field we fly on. In the spring the gliders just stick into the ground and in the summer they just bounce. All our gliders are built with white glue don't use Ca. and am careful with joints ,don't fill gaps. I have gone to bass wood L.E. to keep the dings down. These Silly putty timers are easy to make (after you make the fist one), one draw back is the putty does dry out and needs to be changed each year and the temperature affects the speed they turn. I'm a fun flier for the most part so the time change isn't a big deal I just want my glider back after sticking it in a thermal, love that when it happens.     Bruce     
       
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lincoln
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« Reply #36 on: March 12, 2019, 09:31:21 PM »

I had good luck with a pop can DT until on one flight I thought "What's that tiny silver thing in the air?". You can guess what happened to that model. Recommend using some other material that doesn't break when fatigued. Plastic pop bottle?

Once in a while I try to think up a DT that won't add drag when retracted, but I haven't got a good answer yet. The one in the picture is probably better than most.
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KingDelta5
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« Reply #37 on: March 12, 2019, 10:42:03 PM »

Hello Smiley
I will try again !
I must obtain a couple of things for the the Dethermalizer Smiley
And will build another dart

My comments about the dart are !
It was very easy to trim !
Almost perfect as built to the plan !
I did have to add just a smidge of up elevator !
A very very tiny amount of up !
A tiny bit of clay to the right wing !
She made circles of maybe 75 to 100 feet in diameter !
I built in just about 1/2 the first dihedral angle worth of tail tilt !
I also used a bass stick for the fuselage
It had one coat of unsanded Minwax Spar urethane
I used titebond wood glue
I spend time with wing Construction
I cut everything apart
Make all wing pieces as absolutely symmetrical as I can
I then miter sand the connections
I do not like gaps
Also I use a bit of hardwood for the rubber hook !
When I get a model trimmed I do not show mercy with the rubber Smiley
I like to zing em on up there Smiley

I am currently searching for all the information I can find on this Silly Putty Dethermalizer

I shall build another !
This time I will go all out
I will use a bit of my precious Sitka Spruce for the fuselage stick
Very likely will laminate the Leading Edge
This here is March Smiley
Kite Flying season here actually
Though I am a maniac
I have spent quite a few hours lately
walking on wet grass with wet feet waiting for the wind to slack up !
TNX Smiley

I have a lot of silly putty Smiley
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Re: Lucky air/lost Lawn Dartie
« Last Edit: March 12, 2019, 10:52:56 PM by KingDelta5 » Logged
DerekMc
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« Reply #38 on: March 14, 2019, 02:44:23 AM »

Hello Smiley
I will try again !
I must obtain a couple of things for the the Dethermalizer Smiley
And will build another dart


I am currently searching for all the information I can find on this Silly Putty Dethermalizer


A nice explanation on how to build a silly puddy timer:

http://www.gregorie.org/freeflight/silly_dt/index.html
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They fly better when you smile!
Derek
KingDelta5
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« Reply #39 on: March 14, 2019, 10:28:42 AM »

DerekMc tnx for reply and the link !

I want to read all I can find from everywhere I can find on the Silly Putty DT`s Smiley
Silly Putty DT`s sounds like some sort of condition  Grin
I look forward to the time I can obtain the proper aluminum tubing
Best Tu U and TNX
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