PeterDebney
Banded Mongoose
One aspect of the Aslan that has long bothered me is the illustrations of their dew claw. I have not yet seen one that makes anatomical sense: none of them allow for the claw to be inside the “hand” or limb and leave the whole still functional.
As far as I know there are 4 possible solutions for a dewclaw:
1. Claw rotates out against the direction of the point. I don’t know of any examples in nature, possibly because it would be quite weak in use: the muscles and impact work in the same direction.
2. Claw rotates out with the direction of the point. This is how cats’ claws work (see https://www.britannica.com/science/claw), though cats cannot retract their dewclaws. This seems to be the assumption shown in Aliens of Chartered Space 1.
In both cases, rotating claws need to be either compact or have a large slot to fit in.
3. Claw telescopes out (like a wasp sting). This is the assumption shown in the core rule books. This is unsatisfactory for a number of reasons. Firstly, there is no room in the hand as drawn to fit the claw inside. Secondly, because to have room the claw would have to extend through the wrist, meaning that the claw can only be extended or retracted if the hand is angled right back. Thirdly because either the muscles need to be in the hand (muscles work by pulling not pushing) or, if the muscles are in the wrist, there needs to be a long bone or length of claw that remains in the forearm, leaving the wrist inflexible when the claw is extended. Alternatively, Aslan are like spiders, which don’t have muscles and use hydraulics instead (the approach used by most mechanical telescoping devices).
Also, having such a structure passing through the wrist will significantly weaken the wrist, leaving it all very vulnerable to damage.
4. The dewclaw is fixed (like for cats and dogs) but that removes the extension option.
Also, in most of these cases, the claw cannot align with other claws without seriously increasing the thickness of the hand due to the internal bone structure.
So, how can we have extendable Aslan dewclaws without them being an example of hand-waving (or should that be paw waving)?
I may have been thinking about this too much…
As far as I know there are 4 possible solutions for a dewclaw:
1. Claw rotates out against the direction of the point. I don’t know of any examples in nature, possibly because it would be quite weak in use: the muscles and impact work in the same direction.
2. Claw rotates out with the direction of the point. This is how cats’ claws work (see https://www.britannica.com/science/claw), though cats cannot retract their dewclaws. This seems to be the assumption shown in Aliens of Chartered Space 1.
In both cases, rotating claws need to be either compact or have a large slot to fit in.
3. Claw telescopes out (like a wasp sting). This is the assumption shown in the core rule books. This is unsatisfactory for a number of reasons. Firstly, there is no room in the hand as drawn to fit the claw inside. Secondly, because to have room the claw would have to extend through the wrist, meaning that the claw can only be extended or retracted if the hand is angled right back. Thirdly because either the muscles need to be in the hand (muscles work by pulling not pushing) or, if the muscles are in the wrist, there needs to be a long bone or length of claw that remains in the forearm, leaving the wrist inflexible when the claw is extended. Alternatively, Aslan are like spiders, which don’t have muscles and use hydraulics instead (the approach used by most mechanical telescoping devices).
Also, having such a structure passing through the wrist will significantly weaken the wrist, leaving it all very vulnerable to damage.
4. The dewclaw is fixed (like for cats and dogs) but that removes the extension option.
Also, in most of these cases, the claw cannot align with other claws without seriously increasing the thickness of the hand due to the internal bone structure.
So, how can we have extendable Aslan dewclaws without them being an example of hand-waving (or should that be paw waving)?
I may have been thinking about this too much…