Heng Long Challenger 2.Metal Tracks and Sprokets etc.

[Pavel]

I will express one thought (maybe it is stupid).
On my friend's website (aviation) there is a section "Materials and photos"
Colleagues collect information on different aircraft and the admin systematizes them and publishes them in open access for registered users.
And makes life easier for those who are going to build this or that aircraft, there he chooses the information that he considers useful for himself.
The library is constantly being replenished with new finds, scans from books and rare photos from the Internet...