Re: Hmodel ASH 25 Mi
Posted: 09 Jun 2017, 22:54
Thanks Phil,
My bungee arrangement will be very simple with just a straight pull on to a strongly mounted Kavan hook fitted to the underside of the fuselage approximately halfway between the C of G and the nose. As it is only necessary to get the model a few inches off the ground at a velocity in excess of the model's stalling speed, there shouldn't be a problem.
Rise-off-ground bungee launches were being done successfully 25 years ago as can be seen on the following video which was shot be one of our group who still flies regularly at Thurnham.
Go to 2 minutes into the video to see the successful launch of a large heavy model using a simple v-bungee arrangement with the ends being held by fellow fliers. The first attempt can be seen at 1 minute in, when the bungee wasn't stretched sufficiently to allow the model gain flying speed.
I have heard of some people trying to bungee launch using the normal tow release facility with the inevitable disastrous results, so don't be tempted to go that route.
Best regards, Eric
PS - I found the problem with the outer aileron - embarrisingly simple to resolve!
My bungee arrangement will be very simple with just a straight pull on to a strongly mounted Kavan hook fitted to the underside of the fuselage approximately halfway between the C of G and the nose. As it is only necessary to get the model a few inches off the ground at a velocity in excess of the model's stalling speed, there shouldn't be a problem.
Rise-off-ground bungee launches were being done successfully 25 years ago as can be seen on the following video which was shot be one of our group who still flies regularly at Thurnham.
Go to 2 minutes into the video to see the successful launch of a large heavy model using a simple v-bungee arrangement with the ends being held by fellow fliers. The first attempt can be seen at 1 minute in, when the bungee wasn't stretched sufficiently to allow the model gain flying speed.
I have heard of some people trying to bungee launch using the normal tow release facility with the inevitable disastrous results, so don't be tempted to go that route.
Best regards, Eric
PS - I found the problem with the outer aileron - embarrisingly simple to resolve!