SAN FRANCISCO Engineers at Intel are applying lessons from aircraft design to create sturdier laptops in a bid to reduce the prices of the new ultra-thin computers the top chipmaker is promoting heavily.

Intel is counting on the super-thin laptops, a category it has dubbed ultrabooks, to add some pizzazz to a PC market languishing due to the growing popularity of Apple Inc's iPad.

Combining the best of laptops and tablets, the ultrabooks will have large, touch screens, "instant on" responsiveness and razor-thin dimensions all expensive features that have left some on Wall Street wondering if they might be too expensive for average consumers.

Engineers at Intel's Dupont, Washington R&D center, including former Boeing Co employees, have come up with a design method to make plastic laptop cases as strong as more expensive metal ones. That may cut the cost of future ultrabooks by between $25 and $75, said Ben Broili, head of the team.

Their work is an example of the steps Intel is taking to find ways to make future ultrabooks more affordable without cutting the prices of its processors.

At a meeting with analysts last month, Intel Chief Executive Paul Otellini said ultrabooks would be available for as little as $699, but many are expected to be priced nearer to $1,000.

Borrowing from the aerospace industry, the engineers have found that hard drives, motherboards and other components that make up the guts of a PC can be laid out in ways that make the laptops structure much stronger.

"We didn't develop a new material. We are able to use an existing plastic with an existing manufacturing technology," he told Reuters in a telephone interview. "It just requires some more upfront thought initially about how you lay your system out and how you can bring these things together and tie them in."

Different components in the laptop can be leveraged to support its chassis, or even dissipate heat from the processor, he said.

"There is no one size fits all," Broili added. "We're trying to enable the entire industry. You can make trades, move stuff around; and if you don't want your hard drive here, then move it. You have a menu you can pick from and see what you win or lose from a cost and quality standpoint."

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Intel inspired by aerospace to make sturdier laptops