- May 26, 2017
- Merrill, Wisconsin, USA
Please forgive me for any stupid statements I might make here, because I am operating at the very limit of my thinking abilities.I disagree with your premise.
If you extend the tail arm, you may not have to enlarge the horizontal tail at all. Your current boom is big enough at the supports, but way oversize as it goes aft. A new tailored tailboom will be right-sized everywhere and is thus likely to save some weight aft;
If you enlarge the tail but hold the tail length, the W&B result will be similar to the above. Your current boom is big enough at the supports, but way oversize as it goes aft. A new tailored tailboom will be right-sized everywhere and is thus likely to save some weight aft;
In between we have smaller changes in boom length and tail size, with similar effects;
In total, a well designed new tail boom, tailored appropriately will likely have little effect on Weight and Balance.
Remember that any increase in tail volume also moves your neutral point aft, giving you more margin on aft CG. Now as to adjusting wing sweep, it both moves your CG and moves your neutral point. It can change the stall behaviour too. This makes you the test pilot for finding your new aft CG limit while exploring your stall behaviour.
If I see it correctly, even if I manage to extend somehow magically my tail pipe by 2 feet without adding any weight. I will be increasing arm and as a result CG will move aft. I agree that it will be very little and no compensation with ballast up front will be necessary. But it will move for sure!!!.
And yes, I agree, that this will be better behaving Aircraft with bigger tail volume. And new carbon fiber tail boom without aluminum pipe inside will improve flow to horizontal tail and can be longer to get to Vh = 0.5-0.6 or so.
And if new carbon tail will end up little bit heavier then I hope. Can I change wing swept to positive 1° or so to get my CG where I needed? Nothing will be wrong with that? They build wings on my airplane perfectly square. They just attached them with crooked brackets to get to 1 or 2° negative swept. I made wings straight with zero swept using different brackets. I don't see nothing wrong to change to 1° positive swept if necessary for CG reasons after I am all done with working on new tail.
"In total, a well designed new tail boom, tailored appropriately will likely have little effect on Weight and Balance." - I really like the statement.