Hip Pocket Builders' Forum

Outdoor Free Flight Forum => Catapult Launched Gliders => Topic started by: Skip on June 09, 2018, 09:16:42 PM



Title: clay
Post by: Skip on June 09, 2018, 09:16:42 PM
What is the best clay to use to weight nose of gliders?  Play dought is not working  Thanks


Title: Re: clay
Post by: Mikek on June 09, 2018, 10:07:59 PM
Don’t know what the competitive glider fliers use. On rubber models and jet catapult gliders I use something called Duct Seal Compound that I got at Home Depot. I’t grey, heavy, easily moldable. There is also Tungsten clay that you can get from Hobby Lobby ( look in section with Boy Scout pine wood derby cars). I believe George at Volare sells it also.


Title: Re: clay
Post by: spliffsecond on June 10, 2018, 03:03:59 AM
I am no expert but use poster mount (blue tack) whitout any problems,
sometimes I even use it to keep leadfoil on rubber planes and it stays put.

Grtz free


Title: Re: clay
Post by: OZPAF on June 10, 2018, 04:11:00 AM
I have found that the best 'clay" to use is artist's modelling clay and not an air hardening variety. It may cost more but it sticks onto balsa better and it is much easier to remove small amounts(pin head sized balls) for trimming.

John


Title: Re: clay
Post by: Beazld on June 10, 2018, 07:17:30 AM
Another option to clay is lead tape used for weighting golf clubs. You can get it at golf supply stores.


Title: Re: clay
Post by: VictorY on June 10, 2018, 11:35:44 AM
Permoplast modeling clay works for me. And once I figure out how much I need. I remove it and replace most of it with lead pellets, leaving only a small amount of clay for fine tuning.


Title: Re: clay
Post by: Tmat on June 11, 2018, 10:56:06 AM
Plasticine is what I've used for years. Doesn't go hard and is dense enough to not require an enormous blob. And it comes in various colors. The cool kids use black Plasticine with carbon fiber fuselages :-)
Typically, I use sheet lead at the nose to get close to the correct CG, then fine tune with Plasticine.

Tmat


Title: Re: clay
Post by: mike on June 11, 2018, 02:58:35 PM
We had a discussion on the forum before......

http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=22079.msg207377#msg207377


Not directly relevant to this thread but the low melting-point bismuth alloy mentioned later in this thread fromBARCS may be of interest, if you need a lot of weight in an odd-shaped, small space.

https://www.barcs.co.uk/forums/topic/7198-not-enough-room-for-nose-weight-try-this/?tab=comments#comment-147156



Title: Re: clay
Post by: OZPAF on June 11, 2018, 07:47:55 PM
There is one point to keep in mind re the density of the ballast. In some areas - gliders etc - the final trimming may involve removing small amounts of ballast. Here the lower density of plasticine enables smaller weight alterations for a given tiny reduction of ballast. Some of these materials are not easy to remove in small amounts and while ok for the final trim ballast are not as good during the initial fine tuning stages.

John


Title: Re: clay
Post by: Skymon on June 12, 2018, 03:20:58 AM
I like Blu tack.
It's pretty dense for squishy stuff, it's sticky so it stays put and it doesn't go hard like cheap modelling clay.
The fact that it's sticky means you can pretty much just add it anywhere you want.

When I am trimming gliders for indoor I keep adding blobs at the CG to increase weight until I get the glider to the ceiling.

HTH
Si