Bruno Senna admits his Hispania's team financial difficulties have been hitting the Spanish squad's plans to develop its car.
The team made its Formula 1 debut this year without any testing whatsoever after months of uncertainty over its future, which was finally secured by Spanish businessman Jose Ramon Carabante. The lack of resources, however, has meant that HRT has hardly been able to develop its car during the season.
Senna also said that, as of now, the team cannot guarantee its presence on the grid next year.
"The financial difficulties hinder the development of the car," Senna told Brazilian media. "We are able to keep the team running through the end of the year. But we can not be like Red Bull, which always has little or big things in the car every weekend.
"Few teams are guaranteed to be on the grid next year. Formula 1 is not easy. The Hispania and other teams can not give that guarantee."
Senna admitted the team's situation changed from when he signed his contract until the start of the season.
"We knew it would be a risk to enter into a new team," he said. "But essentially it changed between when we signed and the start of the season. We made a firm contract and we could not predict what lay ahead."
He added: "We had a big learning process. We started the year without testing. We have been working and making the most of the car. We had small updates to the car like the fuel tank, electronics...every weekend we're getting new things [from the car]."
The Brazilian said the team was in talks with Toyota over the use of parts from its F1 car, but conceded the situation was also complicated.
"There are talks with Toyota, but it's not easy to know how things stand. Hispania needs FIA homologation to use those parts. Things are a bit more complicated."