What kind of material is the Black Thunder made of?


We chose, from our point of view, the absolutely best, but unfortunately most expensive alloy AL 7075 T6.
AL 7075 (AlZnMgCu1,5) has an extreme tensile strength and it is also extremely durable. It thus has exactly the attributes we wanted to give our Black Thunder. AL 7075 is used in airplane construction and space technology and it commonly is referred to as Aircraft Aluminum.

Comparison of tensile strength:

Alloy                tensile strength [N/mm²]
Aluminum             60-130
AL 7075 T6          420-530

To achieve the highest precision possible in production, we only use T6 material which has undergone a special heat treatment during production of the raw aluminum plates and afterwards has been stored with high temperatures for a considerable time. With these energy-intensive and time-consuming measures, a special homogeneity of the alloy structure can be achieved and the metal is mostly free of inner tension. Unfortunately, this extra treatment makes the raw material more expensive.



Why is the Black Thunder only available in black?


Our Black Thunder has been designed for robustness and durability without compromises. This is true not only for the choice of alloy but naturally for its surface treatment, as well.

Very often high quality risers are anodized which gives a very good surface protection and it allows free choice of tinting. Anodizing produces an electrolytical oxidization coating which hardens the surface. Additionally, it is possible to apply colored pigments to this layer.

We found the normal anodizing protection not tough enough for our Black Thunder and therefore we decided not to simply have our risers anodized but hard-anodized (also known as ‚hard-coated‘). The essential difference is the much more resistant oxide layer with fewer and smaller pores.

One disadvantage of this hard-coating should not be concealed. The hard-coated surface can be colored during the anodization with only dark pigments. Therefore, the Black Thunder remains black but let’s be honest: Who wants a Black Thunder that is not black?




Why are Stolid Bull risers so heavy?


We strongly believe that a riser should have some weight to achieve maximum stiffness and maximum stability during release.
Well, for example a Black Thunder weighs around 2.300 grams equipped with a bare bow weight and that IS heavy.
On the other hand every recurve archer mounts stabilizers onto his or her bow and equips it perhaps with additional weights to achieve maximum stability during release. Very often the total weight of such a fully equipped recurve goes well above 2.000 grams.
A bare bow archers perhaps buys a riser which weighs 1.300 -1.400 grams and mounts bare bow weights onto it with additional 600 grams or more. Why? They want to achieve more stability of the riser during release.
In both cases the risers are quite lightweight with the intrinsic problem that filigree constructions are often prone to stability problems. Why buy a lightweight but potentially unstable riser and then add additional weight onto it?
We decided to construct our risers directly with more mass integrated into the riser and be sure that we can deliver maximum stability even for the most powerful limbs available.
So, be sure: Our risers are no toys, they are tools.