Learning speed for a double is very hard. On my track, I am the only person that will do the big jumps, so I don't have anyone to learn from. Also, on my track are the biggest jumps I have ever done. So learning them can be tough the first few attempts.
My latest double is located after a three foot single out of a corner (first gear) and then there is a corner and at the end of the corner is the double. This really makes it interesting. One mistake on the corner leading up to the single, jumping the single, or on the turn after it will ruin your chances of making the double.
So I learned this by going for the jump and then backing off and rolling over the double right at the end. I did this untill I was confident in the other parts (both added at the same time). Then when I finally decided to try it, I went straight at it (not on the track). I rolled it. Then I did it and landed right where the front end would start on the uphill of the landing. Then I went full throttle and jumped it. I overshot it but I kept doing it over and found the speed where I hit it right. Then I did it on the track and it was fine.
From what you have said, he should already know the track pretty good. Just get him to jump the first jump a little ways until he gets almost to the uphill of the landing. Then tell him to hit it faster.
But it wouldn't hurt to make him wait longer either.
My latest double is located after a three foot single out of a corner (first gear) and then there is a corner and at the end of the corner is the double. This really makes it interesting. One mistake on the corner leading up to the single, jumping the single, or on the turn after it will ruin your chances of making the double.
So I learned this by going for the jump and then backing off and rolling over the double right at the end. I did this untill I was confident in the other parts (both added at the same time). Then when I finally decided to try it, I went straight at it (not on the track). I rolled it. Then I did it and landed right where the front end would start on the uphill of the landing. Then I went full throttle and jumped it. I overshot it but I kept doing it over and found the speed where I hit it right. Then I did it on the track and it was fine.
From what you have said, he should already know the track pretty good. Just get him to jump the first jump a little ways until he gets almost to the uphill of the landing. Then tell him to hit it faster.
But it wouldn't hurt to make him wait longer either.