|Chris Freeman 3||14/02/2020 09:21:10|
|353 forum posts|
Do you have any expo on the elevator? Years ago whilst teaching my son to fly a Spitfire I set up some expo to soften the elevator and that it made the Spitfire a pig to land as it would not settle on the approach and porpoise. We found that flaps and undercart down would lower the nose so you counter with some up and when you want to land the expo is now working against you as it is now a super sensitve elevator. Taking the EXPO out changed the situation and the Spitfire was back to the pleasent landing one that I was used to.
|Jon - Laser Engines||14/02/2020 09:38:27|
|5422 forum posts|
With gear and flaps down its almost impossible to hold the nose up without the ele/flap mix so adding more weight to the front wont help us and the rollercoaster nature of the approach seems to stem from the fact that the wing just provides so much lift that a small deviation in pitch, in either direction, has a significant impact. As the model is very slow when landing the tail looses effectiveness, which is not uncommon on a warbird, so higher rates are needed. This would all be fine if the wing was not so sensitive to pitch at low speed and that where we will focus our attention.
Chris, no expo. Expo is a powerful tool but it is over used and very often used at the wrong times. I had a similar experience to you with a H9 Spitfire where a club mate could not get the thing on the ground as it was all over the place on approach. I looked at his tx settings and was horrified to find 60% rates and 65% expo. I dropped the rates to 25% and ditched all the expo. It was on rails after that.
The trap was he set the radio up according to the deflections called for in the manual. As it was too sensitive he added expo, as thats what popular misconception told him to do. This didnt help so he added more, and more... When i and another warbird proficient friend looked at it we immediately saw that the travel was too high and that was the root cause of the problem. Out of 12 models only one of mine has 10% expo in it and even then only on 1 channel. Its just not needed on the rest of them.
Always get rates set first, then add expo as the cherry on top. On warbirds starting with 30% is just insanity in my view as you are on the back foot before you even begin.
Edited By Jon - Laser Engines on 14/02/2020 09:39:58
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