This is Igor. You can clearly see three separate bikes in this one frame. The main diamond is a Falcon Legacy that was rescued from the local dump, along with the purple Universal. The Townsend Hot Rock was acquired from my dad. The three frames are bog standard cheap steel frames, ideal for learning on but somewhat heavy. The forks are from the Townsend as the Legacy forks were somewhat bent.
The two frames are joined by a bar made by joining two tubes from the Universal. This will hopefully minimise the stress on the top joint.
This is the main joint between the two frames. The head tube has been sliced in half vertically and brazed directly on to the seat tube of the bike in front.The joints weren't mitred particualrly well so there is a lot of braze material around. It looks a bit better after some attention from a wire brush and angle grinder.
This is the front bottom bracket. The down tube from the Universal was cut with a segment from the bottom bracket, mitered to sort of fit, then brazed on. The bottom bracket shells are not the same steel as the tubes, and are not particualrly wettable with the braze metal. The expert opinion was that they might have a high silicon content.
The rear part of the bottom tube. The tube from the Universal was not long enough so a second tube was cut and slid inside (friction fit). This was mitred to fit the downtube and BB from the second frame and brazed in place.
This dropout was brazed on to hold a spare rear derailleur for use as a chain tensioner.
The seat clamp from the universal was brazed on to the stem to make a stoker stem, then cut off the down tube. Not very tidy but it is solid. I was pleased to see, on cutting through the piece, that there was good penetration of braze metal into the joint.
And here is a close up of the stem
The next thing to do is to throw some wheels on, add some bars and seats and see what it looks like...
Starting to look like a bike
Long view.
And a close up of the stoker's stem.
A lick of paint and all the rest of the parts, and Igor will be ready for the road.