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Various instruments

I am attracted to teardrop designs for fretted instruments because to me they embody the maximum in playability, strength and efficiency. So when I want to try out an idea, that is what I usually start with. The instruments on this page all have Eucalypt bodies.


This instrument has 5 courses of strings. It can be tuned like a Brazilian guitar (viola caipira), like a normal guitar without the low E (the tuning I use), or in a variety of open tunings as used by Celtic musicians. They often call this type of 10 string instrument a cittern, a name borrowed from a Renaissance instrument.

It can also be made as a fluorocarbon strung verson, which plays more like a lute.

Here is a video finger picking it like a guitar



This is a mandolin with a fixed bridge and fluorocarbon strings. It sounds more like a classical Italian mandolin than a bluegrass instrument. It can be played with minimal effort using a plectrum or fingers. As well as playing it mandolin style, you can use Latin strums like a charango, cross pick it like a banjo, or pluck it like a lute.

The strings are Worth clear E-.47, A-.66, D-.91 and G is a classical guitar A string.

Here is a video playing it with fingers.

and another video playing it with a plectrum

Here is one using ukulele tuning

Amplified using an undersaddle pickup


There have been a number of basses over the years that have greatly reduced the scale length by using soft strings. The first I know of is the Ashbory bass from the 80s. More recently the Road Toad U-bass has become a real contender. This prototype uses the U-bass scale of 20 inches (51cm).

The sound is remarkably close to an acoustic bass mainly because of the soft attack and a lack of harmonics. But it requires some real care handling the strings, if you press too hard they can roll under the fingers. But once you get the hang of playing lightly, it is effortless.


This fluorocarbon strung instrument is the size of a mandola. It is currently tuned like a tenor ukulele but one tone higher (ADF#B). This gives it the same scale to pitch ratio as a guitar.

The lower strings have octave pairs. Gauges in mm from left are .52 1.1 .40 .74 .57 .57 .47 .47

The head is short so that it will fit into an ordinary mandolin case.


I was inspired by Aleksei Arkhipovsky playing the balalaika. I didn't want to make a traditional one, so I stretched my mandolin design and adapted it to balalaika acoustics. There are very few instruments that combine a tailpiece with non-steel strings. This produces a very round sweet sound, which is mellowed again by the fact that the body pitch is lower than the lowest string pitch.

I chose to use four strings instead of three as it opens up many other tunings including ukulele and mandola. (The balalaika, tenor uke and mandola all have the same scale length.)


Here is a video using ukulele tuning

The tuning is ADF#B with Worth strings .110, .074, .062, .047. This produces about 5 kilos per string. (The A is lower pitched than the D.)

Fluorocarbon strings

Fluorocarbon is a name that can describe any compound composed of fluorine and carbon, but in this case it is used as the commercial name of polyvinylidene fluoride (PVDF) which was invented about 30 years ago by Kureha Chemical in Japan.

Fluorocarbon strings look like nylon but the similarity stops there. Fc has a density of 1.8 g/cm3 whereas nylon has a density of around 1.15. Having more mass and strength, you can use a thinner string at higher tension. The attack and sustain of the note is somewhere between steel and nylon strings. They seem match the tone of the wound strings on a classical guitar better than nylon strings.

You can buy the strings as fishing leader made by Kureha under the Seaguar brand. I get them from Worth strings in Japan who sells them as ukulele strings. He will also sell any gauge by the meter if you email him for prices.

There are other makers of fc fishing leader, but the ones I have checked out were not accurate enough for strings. There are also fc classical guitars strings available but the ones that I tried delaminated, which means that they use a different construction method. The Kureha strings I use can last for years, although some players have reported occasional breakage of the highest string. Info for fitting fluorocarbon strings.