Check Vans website
All the info you need is here:
http://www.vansaircraft.com/public/models.htm
Of course to answer your question it depends on empty weight of aircraft and fuel. Go to Vans web site & look up the empty weight (recommend or estimated) and gross weight limit. Just subtract the two. Than subtract fuel capacity x 6 lb/gal for full fuel payload. Fuel capacity is also noted on Vans website. Here are some ball park real world estimates, using actual average empty weights for builder competed RV's.
max gross - average builder empty weight* = Total pay load/fuel capacity
RV4
...1500-980=520
...(591#)
RV6
...1600-1058=542 (609#)
RV6A
.1600-1105=495 (589#)
RV7
...1800-1073=727 (713#)
RV7A 1800-1092=708 (697#)
RV8
...1800-1102=698 (707#)
RV8A 1800-1101=699 (707#)
RV9A 1750-1086=664 (699#)
* Empty Wt's are averages of completed RV's I recorded. There where 11-RV4's, 50-RV6's, 25-RV7's, 22-RV8's & 7-RV9A.
# Using Van's estimate, spec weights
The real world empty weights tend to be a little more than Van's estimate. The RV7/8's are close to Vans empty wt numbers. RV4/6's tend to exceed Vans estimate probably, in part due to the fact RV4/6's where intended for lighter engine/props than what was planned for the RV7/8's, which also have 200lb-300lb more gross weight capacity. Builders now tend to bigger and heavier engine/prop combs than the earlier builders did. For some reason the 22 RV6A's where real heavy. Subject to controversy and debate some RV'ers just raise their max gross wt. above what Van recommends. The better solution in my opinion is build it light.
You can build a light RV, and many builders actually report a lower empty weight than what Van estimates. However builders being goodie junkies there are also a few that come in real fat.
LESSON - BUILD IT LIGHT
